WO2013132993A1 - 素子の製造方法 - Google Patents
素子の製造方法 Download PDFInfo
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- WO2013132993A1 WO2013132993A1 PCT/JP2013/053813 JP2013053813W WO2013132993A1 WO 2013132993 A1 WO2013132993 A1 WO 2013132993A1 JP 2013053813 W JP2013053813 W JP 2013053813W WO 2013132993 A1 WO2013132993 A1 WO 2013132993A1
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- Prior art keywords
- resist film
- layer
- concavo
- convex structure
- silicon
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 33
- 239000004065 semiconductor Substances 0.000 claims abstract description 60
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 32
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000010703 silicon Substances 0.000 claims abstract description 31
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910052814 silicon oxide Inorganic materials 0.000 claims abstract description 26
- 238000001312 dry etching Methods 0.000 claims abstract description 25
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 14
- 239000001301 oxygen Substances 0.000 claims abstract description 14
- 238000005530 etching Methods 0.000 claims abstract description 11
- 230000001590 oxidative effect Effects 0.000 claims abstract description 4
- 238000000059 patterning Methods 0.000 claims abstract description 4
- 239000000460 chlorine Substances 0.000 claims description 17
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 16
- 229910052801 chlorine Inorganic materials 0.000 claims description 16
- 150000004767 nitrides Chemical class 0.000 claims description 9
- 229910052594 sapphire Inorganic materials 0.000 claims description 9
- 239000010980 sapphire Substances 0.000 claims description 9
- 239000011737 fluorine Substances 0.000 claims description 8
- 229910052731 fluorine Inorganic materials 0.000 claims description 8
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims 1
- 239000010410 layer Substances 0.000 description 148
- 239000007789 gas Substances 0.000 description 24
- 239000000758 substrate Substances 0.000 description 23
- 230000015572 biosynthetic process Effects 0.000 description 9
- 239000002243 precursor Substances 0.000 description 9
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 7
- 238000000605 extraction Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 239000002356 single layer Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000004038 photonic crystal Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000010030 laminating Methods 0.000 description 3
- 238000002488 metal-organic chemical vapour deposition Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000000206 photolithography Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 229910002704 AlGaN Inorganic materials 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000009616 inductively coupled plasma Methods 0.000 description 1
- 238000001459 lithography Methods 0.000 description 1
- 229920003986 novolac Polymers 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/80—Constructional details
- H10H20/81—Bodies
- H10H20/819—Bodies characterised by their shape, e.g. curved or truncated substrates
- H10H20/82—Roughened surfaces, e.g. at the interface between epitaxial layers
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/0002—Lithographic processes using patterning methods other than those involving the exposure to radiation, e.g. by stamping
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
- H01L21/321—After treatment
- H01L21/3213—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer
- H01L21/32139—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer using masks
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/01—Manufacture or treatment
- H10H20/011—Manufacture or treatment of bodies, e.g. forming semiconductor layers
- H10H20/013—Manufacture or treatment of bodies, e.g. forming semiconductor layers having light-emitting regions comprising only Group III-V materials
- H10H20/0133—Manufacture or treatment of bodies, e.g. forming semiconductor layers having light-emitting regions comprising only Group III-V materials with a substrate not being Group III-V materials
- H10H20/01335—Manufacture or treatment of bodies, e.g. forming semiconductor layers having light-emitting regions comprising only Group III-V materials with a substrate not being Group III-V materials the light-emitting regions comprising nitride materials
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/80—Constructional details
- H10H20/81—Bodies
- H10H20/814—Bodies having reflecting means, e.g. semiconductor Bragg reflectors
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/80—Constructional details
- H10H20/81—Bodies
- H10H20/819—Bodies characterised by their shape, e.g. curved or truncated substrates
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/80—Constructional details
- H10H20/872—Periodic patterns for optical field-shaping, e.g. photonic bandgap structures
Definitions
- the present invention relates to a method for manufacturing an element having a fine concavo-convex structure.
- the photonic crystal structure for example, when the inner diameter of the concave portion is reduced, the wavelength range in which the light extraction efficiency is increased can be reduced.
- the photonic crystal structure is formed by lithography, in order to improve the light extraction efficiency, the inner diameter of the concave portion and the diameter of the convex portion are optimized and the aspect ratio is increased because of the resolution limit due to the exposure wavelength. The formation of the concavo-convex structure was difficult.
- a method of forming a fine concavo-convex structure by using nanoimprint for transferring a master having a fine concavo-convex structure to a resist has also been proposed.
- the method using nanoimprint since dry etching is performed through a resist film to which the concavo-convex structure is transferred, it is possible to form a fine concavo-convex structure of, for example, several tens of nm or less. Further, since it can be formed by a simple process of pressing the original plate, there is an effect that the manufacturing cost can be reduced as compared with the case where the fine uneven structure is formed by photolithography.
- the resist film may adhere to the original plate, or the shape of the concave portion or convex portion after the original plate is released may be defective.
- the depth of the concave portion of the original and the height of the convex portion are limited. For this reason, it was difficult to form a fine concavo-convex structure with a high aspect ratio using only the nanoimprint process.
- the present invention has been made in view of the above problems, and an object of the present invention is to provide a device manufacturing method capable of forming a fine concavo-convex structure having a high aspect ratio.
- a method of manufacturing an element having a concavo-convex structure a step of forming an organic resist film on a concavo-convex structure forming layer that is a target for forming the concavo-convex structure, and a silicon-containing resist film on the organic resist film.
- a step of patterning the silicon-containing resist film by a nanoimprint process a step of oxidizing the silicon-containing resist film with oxygen-containing plasma to form a silicon oxide film, and the silicon oxide film as an etching mask
- the step of dry etching the organic resist film the step of dry etching the concavo-convex structure forming layer through the silicon oxide film and the organic resist film as an etching mask, the silicon oxide film and the And a step of removing the organic resist film.
- a silicon-containing resist film is laminated on the organic resist film, the silicon-containing resist film is patterned by a nanoimprint process, and the organic resist film is dry-etched.
- a layer resist was formed.
- the film thickness is limited in order to ensure releasability, but by forming a two-layer resist using dry etching, the resist film thickness can be reduced. Can be bigger. Therefore, a high aspect ratio recess can be formed in the concavo-convex structure forming layer via the two-layer resist.
- the resist film made of silicon oxide is formed on the upper layer of the two-layer resist, the selectivity of the concavo-convex structure forming layer with respect to the resist film can be improved.
- the remaining layer of the recess formed by nanoimprinting is removed with plasma containing oxygen and fluorine.
- the gist is to perform the process.
- the concavo-convex structure forming layer is protected from plasma by the organic resist film. That is, when a single layer resist is formed by nanoimprinting, the concavo-convex structure forming layer is exposed to plasma in the step of removing the remaining layer, but by forming two resist layers, the concavo-convex structure forming layer is exposed to plasma. Less chances of being played. For this reason, the change in characteristics due to the exposure of the concavo-convex structure forming layer to plasma can be suppressed.
- the concavo-convex structure forming layer is made of a group III nitride semiconductor, and the concavo-convex structure forming layer is etched with chlorine-containing plasma.
- the gist is made of a group III nitride semiconductor, and the concavo-convex structure forming layer is etched with chlorine-containing plasma.
- the concavo-convex structure forming layer made of the group III nitride semiconductor layer is etched by the chlorine-containing plasma, the selectivity to the silicon oxide film can be improved.
- the concavo-convex structure forming layer is made of sapphire, and the concavo-convex structure forming layer is etched with chlorine-containing plasma.
- the concavo-convex structure forming layer made of sapphire is etched by the chlorine-containing plasma, the selectivity with respect to the silicon oxide film can be improved.
- the concavo-convex structure forming layer includes a plurality of layers, and the concavo-convex structure formation layer is etched with chlorine-containing plasma. To do.
- a fine concavo-convex structure having a high aspect ratio can be formed across a plurality of layers.
- FIG. 3 is a schematic diagram illustrating an example of a light-emitting element having the same stacked body. It is the model which shows 2nd Embodiment which actualized the manufacturing method of the element of this invention as a manufacturing method of a light emitting element, Comprising: (a) is the formation process of an organic resist film, (b) is formation of a silicon containing resist film. Step (c) shows the nanoimprint step.
- the device manufacturing method of the present invention is embodied as a light emitting device manufacturing method will be described with reference to FIGS.
- the light emitting element is embodied in an LED.
- a stacked body 10 constituting an LED includes a substrate 11, a buffer layer 12, an n-type semiconductor layer 13, an MQW layer 14 having a multiple quantum well structure (MQW), and a p-type semiconductor layer. 15.
- MQW multiple quantum well structure
- the substrate 11 only needs to be a substrate on which the buffer layer 12, the n-type semiconductor layer 13, and the like can be epitaxially grown, and silicon carbide, silicon, or the like can be used in addition to the sapphire substrate.
- the n-type semiconductor layer 13, the MQW layer 14, and the p-type semiconductor layer 15 are made of a group III nitride semiconductor containing at least one group III element such as AlN, GaN, InN, AlGaN, AlInN, GaInN, and AlGaInN.
- the n-type semiconductor layer 13 is made of n-type GaN doped with Si or Ge.
- a fine concavo-convex structure AS is formed on the surface of the n-type semiconductor layer 13. That is, in the present embodiment, the n-type semiconductor layer 13 corresponds to the concavo-convex structure forming layer.
- the fine concavo-convex structure AS has a periodic structure having a length of about a wavelength obtained by dividing the wavelength for improving the extraction efficiency of the light emitting element by the refractive index of the material constituting the n-type semiconductor layer 13.
- the radius R of the concave portion or convex portion optimized as a photonic crystal periodic structure and the structural cycle a have a relationship of 0.3 ⁇ R / a ⁇ 0.4, and the aspect at that time The ratio is greater than 1.
- the fine concavo-convex structure AS suppresses the propagation of light in the main surface direction of the n-type semiconductor layer 13 and makes the light emission direction perpendicular to the main surface of the n-type semiconductor layer 13. Extraction efficiency is improved.
- an organic resist material such as a novolac resin is applied on the n-type semiconductor layer 13 by a spin coater or the like to form an organic resist film 20.
- a silicon-containing resist material is applied on the organic resist film 20 by a spin coater or the like to form a silicon-containing resist film 30.
- the silicon-containing resist film 30 is adjusted to a thickness that can ensure good releasability of the original plate in consideration of the viscosity of the material, and the film thickness is smaller than that of the organic resist film 20.
- the pattern of the fine relief structure AS is transferred to the silicon-containing resist film 30 by nanoimprint.
- the original plate N is made of a substrate such as quartz, and a fine structure is formed on the surface thereof by an electron beam or the like.
- the pattern transfer film 30a to which the pattern of the original N is transferred is formed.
- the depth of the concave portion and the height of the convex portion of the original N are long enough to suppress the shape defects of the concave portion 30H and the convex portion of the pattern transfer film 30a.
- the verticality of 30H can be improved. In this state, the remaining layer 30d is present at the bottom of the recess 30H constituting the pattern transfer film 30a.
- the precursor on which the pattern transfer film 30a has been formed is carried into a dry etching apparatus.
- a dry etching apparatus a known apparatus such as an apparatus having an inductively coupled plasma source or an apparatus having a capacitively coupled plasma source can be appropriately used.
- the dry etching apparatus used at this time is provided with a gas supply system for supplying an oxygen-containing gas and a fluorine-containing gas.
- plasma of oxygen-containing gas and fluorine-containing gas is generated and the remaining layer 30d is removed. That is, as shown in FIG. 3A, the surface of the convex portion of the pattern transfer film 30a is etched and the remaining layer 30d is etched, and the organic resist film 20 is formed between the convex portion and the convex portion. Exposed.
- the resist has a single layer structure
- the underlying n-type semiconductor layer 13 is exposed to plasma containing oxygen and fluorine.
- the n-type semiconductor layer 13 is not exposed to plasma during the removal process of the remaining layer 30d, and the n-type semiconductor layer 13 It is possible to suppress changes in the characteristics.
- the precursor from which the remaining layer 30d has been removed is carried into a dry etching apparatus equipped with a gas supply system for supplying an oxygen-containing gas, and the pattern transfer with the remaining layer 30d removed as shown in FIG.
- the film 30a is exposed to oxygen-containing plasma to form a silicon oxide film 30c.
- the precursor is carried into a dry etching apparatus equipped with a gas supply system for supplying a dilution gas such as oxygen gas and argon. Then, oxygen-containing plasma is generated by the plasma source, and the organic resist film 20 is dry-etched through the pattern transfer film 30a. As a result, as shown in FIG. 3C, a pattern forming film 20a patterned along the silicon oxide film 30c is formed, and the two-layer resist 40 is formed by the silicon oxide film 30c and the pattern forming film 20a.
- the concave portion of the silicon oxide film 30c has high verticality
- the concave portion formed in the organic resist film 20 also has high verticality.
- the precursor is carried into a dry etching apparatus equipped with a gas supply system that supplies a chlorine-containing gas. Then, the plasma source is driven to generate chlorine-containing plasma, and as shown in FIG. 3D, the n-type semiconductor layer 13 is dry-etched to form the recess H1.
- a chlorine-containing gas Cl 2 , BCl 3 or the like is used.
- the two-layer resist 40 is thicker than when a resist film is formed only from silicon oxide.
- the depth of the recess that can be formed by dry etching depends on the thickness of the resist film as well as the selectivity with respect to the resist film. Therefore, the n-type semiconductor layer 13 is made of a material having a low selectivity with respect to the resist film.
- a recess having a high aspect ratio can be formed. Furthermore, since the recesses of the two-layer resist 40 have high verticality, the verticality of the recesses formed in the n-type semiconductor layer 13 can also be improved.
- the selectivity of GaN to the mask can be increased.
- the aspect ratio of the recess H1 can be increased by etching with a gas capable of obtaining a high selectivity while using the two-layer resist 40 having a large film thickness.
- the precursor by which the n-type semiconductor layer 13 was patterned is carried in to the dry etching apparatus provided with the gas supply system which supplies oxygen-containing gas and fluorine-containing gas, and pattern The formation film 20a and the silicon oxide film 30c are removed.
- the gas supply system which supplies oxygen-containing gas and fluorine-containing gas
- the formation film 20a and the silicon oxide film 30c are removed.
- a fine concavo-convex structure AS composed of concave portions H1 and convex portions formed at substantially the same pitch is formed in the n-type semiconductor layer 13.
- the MQW layer 14 and the p-type semiconductor layer 15 are epitaxially grown on the n-type semiconductor layer 13 by the MOCVD method or the like to form the stacked body 10.
- the light emitting element 50 includes the above-described stacked body 10, the p-type pad electrode 17, the n-type pad electrode 18, and the insulating layer 19 stacked on the light emission side. These layers are formed by the MOCVD method or the like.
- the n-type pad electrode 18 is formed on the upper surface of the n-type semiconductor layer 13 exposed by removing the MQW layer 14, the p-type semiconductor layer 15, and the transparent electrode layer 16.
- a p-type pad electrode 17 is formed on the upper surface of the transparent electrode layer 16.
- the insulating layer 19 is made of silicon oxide or the like, and is formed on a part of the transparent electrode layer 16 and a part of the exposed n-type semiconductor layer 13.
- the silicon-containing resist film 30 is laminated on the organic resist film 20, and the silicon-containing resist film 30 is patterned by a nanoimprint process. Then, the organic resist film 20 was dry-etched to form the two-layer resist 40.
- the resist film thickness can be increased. Accordingly, a high aspect ratio recess H1 can be formed in the n-type semiconductor layer 13 via the two-layer resist 40.
- the resist film (30c) made of silicon oxide is formed on the upper layer of the two-layer resist 40, the selection ratio of the n-type semiconductor layer 13 to the resist film can be improved.
- the remaining layer 30d formed by the nanoimprint process is removed by plasma containing oxygen and fluorine.
- the n-type semiconductor layer 13 is exposed to the plasma in the step of removing the remaining layer 30d.
- the n-type semiconductor layer 13 is organic. By being protected by the resist film 20, it is not exposed to the plasma. For this reason, the change of the characteristic by the n-type semiconductor layer 13 being exposed to plasma can be suppressed.
- the selectivity with respect to the two-layer resist 40 can be further improved.
- the fine relief structure AS is formed on the substrate 11 made of sapphire. That is, in the present embodiment, the substrate 11 corresponds to the concavo-convex structure forming layer.
- a two-layer resist 40 is formed on the surface of the substrate 11. The process of manufacturing the two-layer resist 40 is the same as that of the first embodiment, and the process of forming the organic resist film 20 on the substrate 11, the process of forming the silicon-containing resist film 30, the process of performing the nanoimprint process, the remaining layer A step of removing silicon, a step of oxidizing the silicon-containing resist film 30, and a step of dry etching the organic resist film.
- the substrate 11 When the two-layer resist 40 is formed on the substrate 11, the substrate 11 is carried into a dry etching apparatus equipped with a gas supply system for supplying a chlorine-containing gas, and the substrate 11 is dry-etched as shown in FIG. Thus, the recess H2 is formed. For this reason, even if it is sapphire in which the selection ratio to the resist film tends to be smaller than that of the III-V group semiconductor compound, the aspect ratio of the recess H2 can be increased by using the two-layer resist 40 having a large film thickness. it can.
- the precursor on which the substrate 11 is patterned is carried into an etching apparatus having a gas supply system for supplying an oxygen-containing gas and a fluorine-containing gas, and the pattern forming film 20a and The silicon oxide film 30c is removed.
- the fine concavo-convex structure AS composed of the concave portions H2 and the convex portions formed at substantially the same pitch is formed on the substrate 11.
- the buffer layer 12 When the fine concavo-convex structure AS is thus formed on the substrate 11, the buffer layer 12, the n-type semiconductor layer 13, the MQW layer 14, and the p-type semiconductor layer 15 are formed on the substrate 11 by the MOCVD method or the like. Form.
- the configuration of the light emitting element 50 is the same as that of the first embodiment, but as shown in FIG. 6, the fine concavo-convex structure AS is formed on the substrate 11 made of sapphire. For this reason, the propagation of light in the main surface direction of the substrate 11 is suppressed, and the light extraction efficiency is improved by making the light emission direction perpendicular to the main surface of the substrate 11.
- the substrate 11 made of sapphire is etched by the chlorine-containing plasma through the two-layer resist 40. For this reason, even if the sapphire has a smaller selection ratio than the group III-V nitride semiconductor, the concave portion H2 having a high aspect ratio can be formed. Moreover, the selectivity with respect to a resist film can be improved by using chlorine containing gas.
- the fine concavo-convex structure AS is formed on the n-type semiconductor layer 13 or the substrate 11, but the fine concavo-convex structure AS may be formed on the transparent electrode layer 16 as shown in FIG.
- a two-layer resist 40 is formed on the transparent electrode layer 16, and the transparent electrode layer 16 is dry-etched through the two-layer resist 40.
- the transparent electrode layer 16 corresponds to a concavo-convex structure forming layer.
- the fine concavo-convex structure AS is formed in the n-type semiconductor layer 13 and the substrate 11, but may be formed in another layer.
- the micro concavo-convex structure AS is formed by the method described above.
- the micro concavo-convex structure AS is formed by taking out from the apparatus and using the method described above. Form.
- the fine relief structure AS may be formed not only in one layer but also in a plurality of layers.
- the fine relief structure AS that reaches the n-type semiconductor layer 13 from the p-type semiconductor layer 15 via the MQW layer 14, the n-type semiconductor layer 13, the MQW layer 14, and the p-type semiconductor layer 15 are formed using a film forming apparatus.
- the recesses constituting the fine relief structure AS are deepened to the n-type semiconductor layer 13, the MQW layer 14, and the p-type semiconductor layer 15 by the method described above. That is, in this structure, the concavo-convex structure forming layer is composed of a plurality of layers (13, 14, 15).
- the recesses H1 and H2 having a high aspect ratio are formed using the manufacturing method of the present invention.
- the manufacturing method of the present invention is used to form the recesses H1 and H2 having a relatively small aspect ratio. It may be used. That is, the thickness of the two-layer resist 40 is ensured by reducing the thickness of the silicon-containing resist film 30 to such an extent that the concavo-convex shape of the transferred pattern is satisfactory, and increasing the thickness of the organic resist film 20 correspondingly. Even in this case, it is possible to improve the perpendicularity of the concave portions constituting the fine concavo-convex structure AS and form a concavo-convex structure having a high aspect ratio.
- the light-emitting element that is one mode of the element of the present invention is a transmissive light-emitting element, but may be embodied as a reflective light-emitting element.
- a reflective layer made of silver or the like and an insulating layer are provided on the back surface of the substrate 11 opposite to the surface on which the buffer layer 12 is formed, and light emitted from the MQW layer is reflected by the reflective layer.
- the light may be reflected toward the insulating layer that is the light extraction surface.
- the device manufacturing method of the present invention is embodied as a light emitting device manufacturing method.
- the element manufacturing method of the present invention is not limited to this, and can be applied to a method for manufacturing a semiconductor element such as a silicon device including a silicon through electrode (TSV), and in particular, is applied to a process of forming a silicon through electrode. be able to.
- TSV silicon through electrode
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Abstract
Description
以下、本発明の素子の製造方法を発光素子の製造方法として具体化した一実施形態を図1~図4にしたがって説明する。本実施形態では、発光素子をLEDに具体化している。
次に、本発明の素子の製造方法を発光素子の製造方法として具体化した第2実施形態を図5及び図6にしたがって説明する。なお、第2実施形態は、第1実施形態の微細凹凸構造ASの形成対象とその製造方法を変更したのみの構成であるため、同様の部分についてはその詳細な説明を省略する。
Claims (5)
- 凹凸構造を備えた素子の製造方法において、
凹凸構造を形成する対象となる凹凸構造形成層に有機レジスト膜を形成する工程と、
前記有機レジスト膜の上にシリコン含有レジスト膜を形成する工程と、
前記シリコン含有レジスト膜をナノインプリントによりパターニングする工程と、
前記シリコン含有レジスト膜を酸素含有プラズマで酸化して酸化シリコン膜を形成する工程と、
エッチングマスクとしての前記酸化シリコン膜を介して、前記有機レジスト膜をドライエッチングする工程と、
エッチングマスクとしての前記酸化シリコン膜及び前記有機レジスト膜を介して、前記凹凸構造形成層をドライエッチングする工程と、
前記酸化シリコン膜及び前記有機レジスト膜を除去する工程とを有することを特徴とする素子の製造方法。 - 前記有機レジスト膜をドライエッチングする工程の前に、ナノインプリントにより形成された凹部の残存層を酸素及びフッ素を含有するプラズマで除去する工程を行う請求項1に記載の素子の製造方法。
- 前記凹凸構造形成層は、III族窒化物半導体からなり、
前記凹凸構造形成層を、塩素含有プラズマによりエッチングする請求項1又は2に記載の素子の製造方法。 - 前記凹凸構造形成層は、サファイアからなり、
前記凹凸構造形成層を、塩素含有プラズマによりエッチングする請求項1又は2に記載の素子の製造方法。 - 前記凹凸構造形成層は、複数の層からなり、
前記凹凸構造形成層を、塩素含有プラズマによりエッチングする請求項1又は2に記載の素子の製造方法。
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TWI515920B (zh) | 2016-01-01 |
KR20130130090A (ko) | 2013-11-29 |
US20140057377A1 (en) | 2014-02-27 |
KR101354516B1 (ko) | 2014-01-23 |
US8921135B2 (en) | 2014-12-30 |
DE112013000281T5 (de) | 2014-08-21 |
TW201342661A (zh) | 2013-10-16 |
JPWO2013132993A1 (ja) | 2015-07-30 |
DE112013000281B4 (de) | 2016-06-09 |
CN103597619A (zh) | 2014-02-19 |
CN103597619B (zh) | 2015-10-14 |
JP5456946B1 (ja) | 2014-04-02 |
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