CN100538378C - Obtain the method for single particle phenomenon cross section and heavy ion linear energy transfer relation - Google Patents
Obtain the method for single particle phenomenon cross section and heavy ion linear energy transfer relation Download PDFInfo
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- CN100538378C CN100538378C CNB2007101779605A CN200710177960A CN100538378C CN 100538378 C CN100538378 C CN 100538378C CN B2007101779605 A CNB2007101779605 A CN B2007101779605A CN 200710177960 A CN200710177960 A CN 200710177960A CN 100538378 C CN100538378 C CN 100538378C
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Abstract
The invention discloses a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation, comprise: measured device is placed on testing position, select energy, fluence rate, fluence, ion that homogeneity is suitable, open the baffle plate of ion beam, described measured device is carried out heavy ion radiation, the predetermined fluence of maximum takes place or reach up to the single particle phenomenon of expection; Write down the number of times of described measured device generation single particle phenomenon SEP, and write down the fluence of described ion and the single particle phenomenon cross section takes place, close ion beam; Reselect ionic species, the repeating step above-mentioned steps; At least selecting more than 5 kinds the LET value to test, is ordinate with described generation single particle phenomenon cross section, is horizontal ordinate with the LET value, obtains taking place the relation of single particle phenomenon cross section and LET.The ability of the device anti-single particle phenomenon that the present invention can be effectively uses space flight is tested, thereby instructs research institute to improve the capability of resistance to radiation of device, improves the reliability of device.
Description
Technical field
The present invention relates to the nuclear physics field, (Single EventPhenomena SEP), particularly relates to a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation about single particle phenomenon.
Background technology
Fast development along with aerospace industry, it is more and more to be applied to spaceborne integrated circuit, and the function of integrated circuit is also more and more, volume is more and more littler, degree of integration improves constantly, make spacecraft become responsive more to the influence of space environment effect, particularly along with the minimizing of integrated circuit live width, integrated level increases, the electric charge that the change of unit point position/logic state needs is more and more littler, and there is a large amount of high energy particles in the cosmic space of spacecraft operation, so device is more and more responsive to single particle phenomenon.
So-called single particle phenomenon, be meant that the single high energy charged particles in cosmic space incides spacecraft microelectronic component sensitizing range, cause that microelectronic component logic error or parafunctional phenomenon are called single particle phenomenon, comprise single-particle inversion (Single Event Upset, SEU), single-particle burns (Single Event Burn-out, SEB), single event latch-up (Single Event Latch-up, SEL), single-particle gate breakdown (Single Event Gate Rupture, SEGR) and the single-particle function stop (Single Event Functionality Interrupt, SEFI).Single-particle inversion SEU is meant single-particle bump integrated circuit, cause the logic state of locking that from 1 to 0 or from 0 to 1 change takes place, comprise reversal commentaries on classics and hard error (Single Event Hard Erro, SEHE), single-particle inversion is not destructive, most cases is that reversal is changeed, and its logical block can be made carbon copies or reset.Single hard error is meant the nonvolatil destruction of semiconductor devices medium that is caused by the single-particle bump, is a kind of irreversible state.Single-particle burns the phenomenon that is meant the big electric current of power transistor leakage-source electrode that is caused by the single-particle bump, causes catastrophic component failure, and feature shows as the drain current increase and surpassed the specified leakage current of setting when dispatching from the factory of drain electrode.Single event latch-up is to cause that by the single-particle bump integrated circuit produces potential or permanent destructive state, can cause a parasitic thyristor structure (PNPN structure) that is equivalent to thyristor, produces the passage of a high electric current of Low ESR.The single-particle gate breakdown is meant the local failure gate breakdown that the single-particle bump causes, causes catastrophic component failure, and feature shows as the grid current increase and surpassed the specified gate leak current of setting when dispatching from the factory.
Spacecraft cost costliness, so spaceborne integrated circuit all needs very high reliability, only device that can the anti-single particle phenomenon in the cosmic space just can be used on the spacecraft, therefore, simulated space environment on the ground comes the ability of the anti-single particle phenomenon of the detection means means that necessitate.
Summary of the invention
The purpose of this invention is to provide and a kind ofly measured device is carried out the method for radiation test, a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation particularly is provided in the ground simulation space environment.
For achieving the above object, technical scheme of the present invention provides a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation, may further comprise the steps: (1) is placed on testing position with measured device, and connect with testing apparatus, start described measured device work, verify that described measured device is working properly; (2) select ionic species, and measure the linear energy transfer LET value of described ion beam, regulate ion beam cross section, make described ion beam cross section size be the area size of described measured device, and measure the homogeneity and the ion beam fluence rate of described whole ion beam cross section; (3) open the baffle plate of ion beam current, described measured device is carried out heavy ion radiation, the single particle phenomenon that statistics takes place is up to the predetermined fluence of maximum or reach the single particle phenomenon number of expectation; (4) close ion beam, obtain the single particle phenomenon cross section takes place; (5) reselect new ionic species or change described energy of ions, incident angle to obtain new LET value, repeating step (2) is to (4); (6) selecting more than 5 kinds the LET value to test at least, is ordinate with described generation single particle phenomenon cross section, is horizontal ordinate with the LET value, obtains taking place the relation of single particle phenomenon cross section and LET.
Wherein, after connecting described measured device and testing apparatus, step (1) also comprises: described testing apparatus, stube cable and signal wire are detected affirmation equipment and connect correct.
Wherein, after described testing apparatus, stube cable and signal wire are detected, also comprise: to described testing apparatus insulate, electromagnetic screen and ground connection operates, and the vacuum tank in the described testing apparatus carried out shading treatment.
Wherein, before described measured device is placed on testing position, also comprise: described measured device is uncapped, and remove the overlayer of the chip surface of described measured device, and the described measured device after uncapping is carried out functional test.
Wherein, before being uncapped, described measured device also comprises: estimate the LET threshold value according to test or the laser test of knowing the real situation of knowing the real situation of described measured device historical data, californium source, and, in step (2), select the LET value to test greater than the ion of described LET threshold value according to described LET threshold value.
Wherein, the described LET of estimating threshold value specifically comprises: (1) has α particle source test figure, has only single-particle inversion to occur, and then the LET threshold value is less than 1MeV/ (mg/cm
2); (2) have the proton test data to have only single-particle inversion to occur, then the LET threshold value is less than 6MeV/ (mg/cm
2); (3) the heavy ion test figure is arranged, then the LET threshold value LET value in the ion experiments data of attaching most importance to; (4) described measured device includes the LET threshold value of bipolarity random access memory, low-power logic circuit, low-power schottky logical circuit, processor, N NMOS N-channel MOS N field effect transistor, P-channel metal-oxide-semiconductor field effect transistor, dynamic RAM device less than 15MeV/ (mg/cm
2); Described measured device include large-scale complementary metal oxide semiconductor (CMOS) device, calibration power logical device, low speed devices, live width more than or equal to the LET threshold value of 10 μ m devices, programmable read only memory device greater than 15MeV/ (mg/cm
2); (5) with the californium source described device is carried out radiation, if single particle phenomenon takes place, then the LET threshold value is less than 43MeV/ (mg/cm
2), otherwise the LET threshold value is greater than 43MeV/ (mg/cm
2).
Wherein, the energy measuring of measuring the linear energy transfer LET of described ion beam comprises: the sheet metal of placing known thickness and density on the local surfaces of surface barrier detector, with described ion beam irradiation sheet metal, obtain two energy peaks, calculate the energy loss that ion beam penetrates described sheet metal according to described two energy peaks, obtain the LET value of described ion beam.
Wherein, described surface barrier detector is calibrated before using.
Wherein, measuring described ion beam fluence rate specifically comprises: utilize scintillation detector that scintillation detector of the every bump of described ion is produced a count signal and measure.
Wherein, select the different aperture of described scintillation detector according to the different ions fluence rate.
Wherein, described scintillation detector photoelectric tube is set and departs from 90 ° of described ion beam axis.
Wherein, the homogeneity of the described whole ion beam cross section of described measurement is specific as follows: adopt a plurality of described scintillation detectors that the whole section of described ion beam is gathered.
Wherein, a plurality of described scintillation detectors of described employing are specially the whole section collection of described ion beam: at described ion beam exterior domain four border scintillation detectors are set and gather.
Wherein, described fluence rate is 10
2~10
5Ions/ (cm
2S).
Wherein, described fluence is accumulated to 10
7Ions/cm
2Or generation single particle phenomenon number of times is accumulated to 100 times.
Wherein, the range of described ion beam penetrates the sensitizing range of described measured device.
Wherein, the range of described ion beam is greater than 30 μ m.
Wherein, reselecting ionic species specifically comprises: selecting for use ion to carry out radiation should select according to the descending order of described LET value.
Wherein, described generation single particle phenomenon is a single-particle inversion, and after single-particle inversion took place, a step or the multistep in further comprising the steps of: (1) changed fluence rate, under the situation of testing tool or gauging table nonoverload, obtain the data of the generation single-particle inversion of described measured device; (2), carry out radiation test again 2 to 3 times, be used to verify the stability of ion beam; (3) change ion beam angle, increase described point or choose different ionic speciess, energy, angle, but have under the situation of identical described LET value, carry out radiation again, whether the validation test value is consistent; (4) after the operational factor of the described measured device of change, carry out radiation again; (5) change test ambient temperature, carry out radiation again; (6) choose another measured device of same batch products, carry out radiation again, be used for the otherness between confirmatory sample; (7) change described ion beam energy to obtain a new LET value, carry out radiation again; (8) change ionic species,, carry out radiation again to obtain a new LET value.
Wherein, do not take place after the single particle phenomenon of described single-particle inversion, step of one in further comprising the steps of or multistep: (1) increases described ion beam fluence; (2) increase described ion beam angle, carry out radiation again; (3) operational factor of the described measured device of change is carried out radiation again; (4) radiation is carried out in the biasing of the described measured device of change again; (5) choose another measured device of same batch products, carry out radiation again; (6) change described ion beam energy to obtain a new LET value, carry out radiation again; (7) change ionic species,, carry out radiation again to obtain a new LET value.
Wherein, at least selecting after the LET value is tested more than 5 kinds, also comprise test figure is carried out record, the test figure of record specifically comprises: the kind of described ion and energy, the type of measured device, model, technology and production batch, the test parameter of measured device, described ion beam incident angle, the used accelerator type of described ion beam, number of times, position, the LET value of single particle phenomenon take place, and generation single event latch-up, single-particle burn, the position when the single-particle grid are worn and LET value.
Wherein, burn SEB or single-particle gate breakdown SEGR if described single particle phenomenon SEP is a single-particle, then described measured device is being carried out also comprising after the heavy ion radiation: (1) writes down the current impulse number of times of each radiation if carry out the SEB attribute testing; If carry out the SEGR attribute testing,, stop ion beam irradiation detecting when described measured device grid current changes the gate current range that surpasses regulation; (2) carry out SEB or SEGR demonstration test, monitor described measured device grid and drain current, change, write down observed condition if observe electric current; (3) turn off ion beam, apply nominal gate voltage at described measured device, the monitoring grid current changes if observe electric current, writes down observed condition; (4) record test figure specifically comprises: record ionic species, ion energy, range, LET value mean fluence rate, fluence and test condition.
Wherein, described SEB attribute testing specifically comprises: to gate source voltage, the drain source voltage bias condition that described measured device is exerted pressure and stipulated, and the fluence of radiation regulation, if SEB takes place, then counter increases counting and carries out record, regulates fluence rate, makes per second that the SEB number take place and is no more than 100, when the fluence of setting reaches, close the ion beam baffle plate, record SEB sum is selected different ions, obtain new LET value, repeat the above step.
Wherein, also carry out the SEB demonstration test after the described SEB attribute testing, specifically may further comprise the steps: electric capacity is placed in the drain electrode at described measured device, gate source voltage, the drain source voltage bias condition of the regulation of exerting pressure, the fluence of radiation regulation if described measured device lost efficacy, then stops radiation.
Wherein, described SEGR attribute testing specifically comprises: to gate source voltage, the drain source voltage bias condition that described measured device is exerted pressure and stipulated, the fluence of radiation regulation if SEGR takes place, then stops radiation, record accumulative total fluence.
Wherein, also carry out the SEGR demonstration test after the described SEGR attribute testing, specifically may further comprise the steps: to gate source voltage, the drain source voltage bias condition that described measured device is exerted pressure and stipulated, the fluence of radiation regulation, if described measured device lost efficacy, then stop radiation.
Technique scheme only is an optimal technical scheme of the present invention, has following advantage: by above technical scheme, the ability of the device anti-single particle phenomenon of can be effectively space flight being used is tested, thereby instruct research institute to improve the capability of resistance to radiation of device, effectively improve the radioresistance means of device, thereby improve the reliability of device and even integrated circuit, finally improve the reliability of spacecraft.But also can improve China's single particle experiment level.
Description of drawings
Fig. 1 is a kind of process flow diagram that obtains the method for single particle phenomenon cross section and heavy ion linear energy transfer relation of the embodiment of the invention;
Fig. 2 is a kind of synoptic diagram that obtains single particle phenomenon cross section and heavy ion linear energy transfer relation of the embodiment of the invention.
Fig. 3 is a kind of proving installation connection diagram of the embodiment of the invention;
Fig. 4 is a kind of device connection diagram of regulating heavy ion beam of the embodiment of the invention;
Fig. 5 is a kind of single event latch-up monitoring and the holding circuit schematic diagram of the embodiment of the invention.
Wherein: 1: the electric charge stripping foil; 2: the surface barrier detector; 3: scintillation detector; 4: vacuum target chamber; 5: the single particle effect test macro.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.
At first the term of using in the embodiment of the invention is made an explanation, fluence rate is meant the number of ions that passes through on the vertical ion beam unit area in the unit interval, and unit is ions/ (cm
2S).Fluence is meant the integration of fluence rate to the epicycle test period, and unit is ions/cm
2Range is meant the specific ion of known charge state and energy under no scattering situation, the distance of incident in target material.Energy is meant that accelerator is given and energy of ions, and unit is the energy of gross energy MeV or every atomic mass unit (MeV/AMU).LET (The Linear Energy Transfer) value is meant that existing energy shifts, i.e. the energy that in dielectric material, deposits on the unit length along the ion incidence track, and unit is MeVcm
2/ mg.The LET threshold value is meant that for a given device single-particle can cause the minimum LET value of a single-particle inversion SEU when vertical irradiation.The quantity of the single particle phenomenon that the single particle phenomenon SEP cross section unit of being meant ion fluence causes is the physical quantity of describing the single particle phenomenon probability of happening, and unit is cm
2/ device or cm
2/ bit represents the SEP cross section with σ, σ=SEP quantity/(ion fluence * cos θ), and θ is the normal angle of ion beam incident direction and measured device, i.e. the incident angle of ion beam.Saturated cross section claims the limit or progressive cross section again, and in saturated cross section, the increase of LET value can not cause the increase in single particle phenomenon cross section.The heavy ion of being mentioned in the present embodiment is meant that electric charge Z is more than or equal to 2 heavy ion.
Fig. 1 is a kind of process flow diagram that obtains the method for single particle phenomenon cross section and heavy ion linear energy transfer relation of the embodiment of the invention.In conjunction with Fig. 1, this method is described in detail.
Should take into full account the latch protection measure during test fixture design, when big electric current occurring, current limiting measures should be arranged, guarantee not occur lasting big electric current.And possesses the function of restarting.Step 107 is reselected new LET value, repeating step 104,105 and 106, and up to selecting above LET value in 5 at least, LET value scope should cover from threshold value to saturated cross section, satisfies test objective, then changes step 108.
If energetic ion equipment can provide the energy of every atomic mass unit up to several GeV, than other ion gun more near the feature of cosmic rays, above test procedure can be simplified, and does not need to the measured device step of uncapping, because the energy of the particle beams enough penetrates the entire device structure.
In addition, also can not predict the LET threshold value of measured device, but need time enough and fund at that rate, because the accent survey of ion beam is needed a large amount of time, and, at present, the expense of carrying out single particle experiment is also very expensive, therefore, and in order to save test period and test funds, the LET threshold value of prediction measured device is very necessary, can finish test more accurately sooner.
If being single-particle, single particle phenomenon SEP burns SEB or single-particle gate breakdown SEGR, wherein, if being single-particle, described single particle phenomenon SEP burns SEB or single-particle gate breakdown SEGR, then measured device is being carried out also comprising after the heavy ion radiation: (1) writes down the current impulse number of times of each radiation if carry out the SEB attribute testing; If carry out the SEGR attribute testing,, stop ion beam irradiation detecting when described measured device grid current changes the gate current range that surpasses regulation; (2) carry out SEB or SEGR demonstration test, monitor described measured device grid current I
GSWith drain current I
DSIf observe electric current and change generalized case, I
GS10
-7Ampere writes down observed condition; (3) turn off ion beam, apply nominal gate voltage at described measured device, the monitoring grid current changes generalized case, I if observe electric current
GS10
-7Ampere writes down observed condition; (4) record test figure specifically comprises: record ionic species, ion energy, range, LET value mean fluence rate, fluence and test condition.The SEB attribute testing specifically comprises: to measured device exert pressure the regulation gate source voltage, drain source voltage bias condition, the fluence of radiation regulation, if SEB takes place, then counter increases counting and carries out record, regulate fluence rate, make per second that the SEB number take place and be no more than 100, when the fluence of setting reaches, close the ion beam baffle plate, record SEB sum, select different ions, obtain new LET value, repeat the above step.
Also carry out the SEB demonstration test after the SEB attribute testing, specifically may further comprise the steps: electric capacity is placed in the drain electrode at measured device, gate source voltage, the drain source voltage bias condition of the regulation of exerting pressure, and the fluence of radiation regulation if measured device lost efficacy, then stops radiation.
The SEGR attribute testing specifically comprises: to gate source voltage, the drain source voltage bias condition that measured device is exerted pressure and stipulated, the fluence of radiation regulation if SEGR takes place, then stops radiation, record accumulative total fluence.Also carry out the SEGR demonstration test after the SEGR attribute testing, specifically may further comprise the steps: to gate source voltage, the drain source voltage bias condition that measured device is exerted pressure and stipulated, the fluence of radiation regulation if measured device lost efficacy, then stops radiation.
Point out simultaneously, the various devices of being mentioned in the present embodiment after submitting to the test application to be given the ratification, all can obtain using at China's nuclear physics laboratory, therefore, be not described in detail about technology contents such as the concrete structure of realizing the device in the embodiment of the invention scheme, using method.
Fig. 3 is a kind of proving installation connection diagram of the embodiment of the invention.Test board and the measured device that is placed on the test board are arranged in the vacuum tank, the fixture of measured device is rack-mount, guarantee that the cable that connects the measured device anchor clamps can not influence the rotation of support and measured device, and can not arrive measured device by the blocks ions bundle.Whether each pin that should detect the measured device socket after installing is normal, and whether erecting equipment connects correctly.And should utilize built-in He-Ne laser instrument to check the alignment case and the position of each socket on the fixture.Power supply is that the electricity consumption device in the vacuum tank is powered.Data acquisition equipment is connected with test board, is used for acquired signal.Test board in upper PC (robot calculator) machine and data acquisition equipment and the vacuum tank is connected, is used for detecting and storing test signal.
Fig. 4 is a kind of device connection diagram of regulating heavy ion beam of the embodiment of the invention.The heavy ion of ion gun emission enters into accelerator through electric charge stripping foil 1, through accelerator quicken the back heavy ion by analysis magnet screen and decontaminated ion beam, measure the energy and the LET value thereof of ion beam by surface barrier detector 2, the feedback measured value makes ion beam reach required value with adjusting for accelerator operation person, utilize scintillation detector 3 to measure the fluence of ion beam, fluence rate and homogeneity then, generally can utilize scattering and method of focusing to regulate the fluence rate and the homogeneity of ion beam.The ion beam that regulates is injected on the single particle effect test macro 5 of vacuum target chamber 4, carries out single particle experiment.
Fig. 5 is a kind of single event latch-up monitoring and the holding circuit schematic diagram of the embodiment of the invention.Wherein judge whether to be meant that less than setting whether the electric current of judging on the restrictor is less than measured device breech lock electric current, if then be communicated with measured device; If not, then restrictor sends to this signal on the processor, and processor disconnects according to this signal control relay, thereby measured device is protected, and is designated as the single event latch-up incident simultaneously one time, restarts then.Necessary writing time during the breech lock, purpose is to calculate effective fluence.
As can be seen from the above embodiments; the embodiment of the invention is carried out the single particle phenomenon test by adopting to spaceborne integrated circuit (IC)-components; thereby obtain the relation between measured device generation single particle phenomenon cross section and the LET value; and then can obtain the ability size of measured device anti-single particle phenomenon; the researchist can be according to the relation between measured device generation single particle phenomenon cross section and the LET value; find the design defect and the design advantage of device; improve the anti-radiation protection measure; improve the reliability of integrated circuit, finally can improve the reliability of spacecraft.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (28)
1, a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation is characterized in that, may further comprise the steps:
(1) measured device is placed on testing position, and connects, start described measured device work, verify that described measured device is working properly with testing apparatus;
(2) select ionic species, and measure the linear energy transfer LET value of described ion beam, regulate ion beam cross section, make described ion beam cross section size be the area size of described measured device, and measure the homogeneity and the ion beam fluence rate of described whole ion beam cross section; The homogeneity of the described whole ion beam cross section of described measurement is specific as follows: adopt a plurality of scintillation detectors that the whole section of described ion beam is gathered;
(3) open the baffle plate of ion beam, described measured device is carried out heavy ion radiation, the single particle phenomenon that statistics takes place is up to reaching maximum predetermined fluence or reaching the single particle phenomenon number of expectation;
(4) close ion beam, obtain the single particle phenomenon cross section takes place;
(5) reselect new ionic species or change described energy of ions, incident angle to obtain new LET value, repeating step (2) is to (4);
(6) selecting more than 5 kinds the LET value to test at least, is ordinate with described generation single particle phenomenon cross section, is horizontal ordinate with the LET value, obtains taking place the relation of single particle phenomenon cross section and LET.
2, a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation as claimed in claim 1 is characterized in that, also comprises after step (1) connects described measured device and testing apparatus:
Described testing apparatus, stube cable and signal wire are detected, and affirmation equipment and connection are correct.
3, a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation as claimed in claim 2 is characterized in that, also comprises after described testing apparatus, stube cable and signal wire are detected:
To described testing apparatus insulate, the operation of electromagnetic screen and ground connection, and the vacuum tank in the described testing apparatus carried out shading treatment.
4, a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation as claimed in claim 3 is characterized in that, before described measured device is placed on testing position, also comprises:
Described measured device is uncapped, and remove the overlayer of the chip surface of described measured device, and the described measured device after uncapping is carried out functional test.
5, a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation as claimed in claim 4 is characterized in that, also comprises before described measured device is uncapped:
Estimate the LET threshold value according to test or the laser test of knowing the real situation of knowing the real situation of described measured device historical data, californium source, and according to described LET threshold value, selection LET value is tested greater than the ion of described LET threshold value in step (2).
6, a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation as claimed in claim 5 is characterized in that the described LET of estimating threshold value specifically comprises:
α particle source test figure is arranged, have only single-particle inversion to occur, then the LET threshold value is less than 1MeV/ (mg/cm
2).
7, a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation as claimed in claim 5 is characterized in that the described LET of estimating threshold value specifically comprises:
The proton test data are arranged, have only single-particle inversion to occur, then the LET threshold value is less than 6MeV/ (mg/cm
2).
8, a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation as claimed in claim 5 is characterized in that the described LET of estimating threshold value specifically comprises:
The heavy ion test figure is arranged, then the LET threshold value LET value in the ion experiments data of attaching most importance to.
9, a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation as claimed in claim 5 is characterized in that the described LET of estimating threshold value specifically comprises:
Described measured device includes the LET threshold value of device of bipolarity random access memory, low-power logic circuit, low-power schottky logical circuit, processor, N NMOS N-channel MOS N field effect transistor, P-channel metal-oxide-semiconductor field effect transistor, dynamic RAM less than 15MeVcm
2/ mg; Described measured device include large-scale complementary metal oxide semiconductor (CMOS) device, calibration power logical device, low speed devices, live width more than or equal to the LET threshold value of 10 μ m devices, programmable read only memory device greater than 15MeVcm
2/ mg.
10, a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation as claimed in claim 5 is characterized in that the described LET of estimating threshold value specifically comprises:
With the californium source described device is carried out radiation, if single particle phenomenon takes place, then the LET threshold value is less than 43MeVcm
2/ mg, otherwise the LET threshold value is greater than 43MeVcm
2/ mg.
11, a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation as claimed in claim 1 is characterized in that the energy measuring of measuring the linear energy transfer LET of described ion beam comprises:
On the local surfaces of surface barrier detector, place the sheet metal of known thickness and density, with described ion beam irradiation sheet metal, obtain two energy peaks, calculate the energy loss that ion beam penetrates described sheet metal according to described two energy peaks, obtain the LET value of described ion beam.
12, a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation as claimed in claim 11 is characterized in that described surface barrier detector is calibrated before using.
13, a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation as claimed in claim 1 is characterized in that, measures described ion beam fluence rate and specifically comprises:
Utilizing scintillation detector that scintillation detector of the every bump of described ion is produced a count signal measures.
14, a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation as claimed in claim 13 is characterized in that, selects the different aperture of described scintillation detector according to the different ions fluence rate.
15, a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation as claimed in claim 13 is characterized in that the photoelectric tube that described scintillation detector is set departs from 90 ° of described ion beam axis.
16, a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation as claimed in claim 1 is characterized in that a plurality of described scintillation detectors of described employing are specially the whole section collection of described ion beam:
At described ion beam exterior domain four border scintillation detectors being set gathers.
17, a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation as claimed in claim 1 is characterized in that described fluence rate is 10
2~10
5Ions/ (cm
2S).
18, a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation as claimed in claim 17 is characterized in that described fluence is accumulated to 10
7Ions/cm
2Or generation single particle phenomenon number of times is accumulated to 100 times.
19, a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation as claimed in claim 18 is characterized in that the range of described ion beam penetrates the sensitizing range of described measured device.
20, a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation as claimed in claim 19 is characterized in that the range of described ion beam is greater than 30 μ m.
21, a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation as claimed in claim 1 is characterized in that, reselects ionic species and specifically comprises:
Selecting for use ion to carry out radiation should select according to the descending order of described LET value.
22, a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation as claimed in claim 1, it is characterized in that, described generation single particle phenomenon is a single-particle inversion, single-particle inversion takes place after, and a step or the multistep in further comprising the steps of:
(1) changes fluence rate, under the situation of testing tool or gauging table nonoverload, obtain the data of the generation single-particle inversion of described measured device;
(2) carry out radiation test again 2 to 3 times, be used to verify the stability of ion beam;
(3) change ion beam angle, increase described point or choose different ionic speciess, energy, angle, but have under the situation of identical described LET value, carry out radiation again, whether the validation test value is consistent;
(4) after the operational factor of the described measured device of change, carry out radiation again;
(5) change test ambient temperature, carry out radiation again;
(6) choose another measured device of same batch products, carry out radiation again, be used for the otherness between confirmatory sample;
(7) change described ion beam energy to obtain a new LET value, carry out radiation again;
(8) change ionic species,, carry out radiation again to obtain a new LET value.
23, a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation as claimed in claim 1, it is characterized in that, described measured device is carried out after the heavy ion radiation, the single particle phenomenon of described single-particle inversion does not take place, step of one in further comprising the steps of or multistep:
(1) increases described ion beam fluence;
(2) increase described ion beam angle, carry out radiation again;
(3) operational factor of the described measured device of change is carried out radiation again;
(4) radiation is carried out in the biasing of the described measured device of change again;
(5) choose another measured device of same batch products, carry out radiation again;
(6) change described ion beam energy to obtain a new LET value, carry out radiation again;
(7) change ionic species,, carry out radiation again to obtain a new LET value.
24, a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation as claimed in claim 1, it is characterized in that, at least selecting to comprise also test figure is carried out record that the test figure of record specifically comprises after the LET value is tested more than 5 kinds:
The kind of described ion and energy, the type of measured device, model, technology and production batch, the test parameter of measured device, described ion beam incident angle, the used accelerator type of described ion beam, number of times, position, the LET value of single particle phenomenon take place, and generation single event latch-up, single-particle burn, the position when the single-particle grid are worn and LET value.
25, a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation as claimed in claim 1, it is characterized in that, burn SEB or single-particle gate breakdown SEGR if described single particle phenomenon SEP is a single-particle, then described measured device carried out also comprising after the heavy ion radiation:
(1), writes down the current impulse number of times of each radiation if carry out the SEB attribute testing; If carry out the SEGR attribute testing,, stop ion beam irradiation detecting when described measured device grid current changes the gate current range that surpasses regulation;
(2) carry out SEB or SEGR demonstration test, monitor described measured device grid and drain current, change, write down observed condition if observe electric current;
(3) turn off ion beam, apply nominal gate voltage at described measured device, the monitoring grid current changes if observe electric current, writes down observed condition;
(4) record test figure specifically comprises: record ionic species, ion energy, ion beam incident angle, range, LET value mean fluence rate, fluence and test condition.
26, a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation as claimed in claim 25 is characterized in that described SEB attribute testing specifically comprises:
To described measured device exert pressure the regulation gate source voltage, drain source voltage bias condition, the fluence of radiation regulation, if SEB takes place, then counter increases counting and carries out record, regulate fluence rate, make per second that the SEB number take place and be no more than 100, when the fluence of setting reaches, close the ion beam baffle plate, record SEB sum, select different ions, obtain new LET value, repeat the above step.
27 a kind of methods of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation as claimed in claim 26 is characterized in that, also carry out the SEB demonstration test after the described SEB attribute testing, specifically may further comprise the steps:
Electric capacity is placed in drain electrode at described measured device, gate source voltage, the drain source voltage bias condition of the regulation of exerting pressure, and the fluence of radiation regulation if described measured device lost efficacy, then stops radiation.
28, a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation as claimed in claim 25 is characterized in that described SEGR attribute testing specifically comprises:
To gate source voltage, the drain source voltage bias condition that described measured device is exerted pressure and stipulated, the fluence of radiation regulation if SEGR takes place, then stops radiation, record accumulative total fluence.
29, a kind of method of obtaining single particle phenomenon cross section and heavy ion linear energy transfer relation as claimed in claim 28 is characterized in that, also carries out the SEGR demonstration test after the described SEGR attribute testing, specifically may further comprise the steps:
To gate source voltage, the drain source voltage bias condition that described measured device is exerted pressure and stipulated, the fluence of radiation regulation if described measured device lost efficacy, then stops radiation.
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