WO2023200354A1 - Термоэлектрический светодиод - Google Patents
Термоэлектрический светодиод Download PDFInfo
- Publication number
- WO2023200354A1 WO2023200354A1 PCT/RU2022/000120 RU2022000120W WO2023200354A1 WO 2023200354 A1 WO2023200354 A1 WO 2023200354A1 RU 2022000120 W RU2022000120 W RU 2022000120W WO 2023200354 A1 WO2023200354 A1 WO 2023200354A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- semiconductor
- graded
- work function
- gap semiconductor
- gap
- Prior art date
Links
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
-
- 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
- H10H20/85—Packages
- H10H20/858—Means for heat extraction or cooling
Definitions
- the invention relates to semiconductor LEDs configured to remove heat.
- Light-emitting diodes are widely used in optical display devices, traffic lights, communication systems, lighting devices and medical equipment.
- a source of infrared radiation is known from the prior art (RU 2154324 C1), including a emitting surface, a recombination region, a passive layer transparent to radiation from the active region, made in the form of a graded-gap material
- the disadvantage of the known source is the low radiation power, which is caused by self-absorption of radiation leaving the recombination region, as well as poor heat removal.
- the objective of the claimed invention is to develop a semiconductor structure of a thermoelectric LED that would remove the generated heat.
- the technical result of the invention is the reduction, absence or negative heat generation during operation of a thermoelectric LED and, as a consequence, eliminating the possibility of overheating of the LED and its failure.
- thermoelectric LED to dissipate energy into the environment in the form of photons.
- the thermoelectric LED contains a graded-gap semiconductor grown on the base with a decreasing work function in the direction of growth of the epitaxial structure over the entire range of compositions and an epitaxial layer of a direct-gap semiconductor grown on the graded-gap semiconductor, wherein the base contains a semiconductor material With n-type conductivity with a work function equal to or close to the work function of the adjacent layer of semiconductor material of a graded-gap semiconductor; a graded-gap semiconductor has n-type conductivity, and a direct-gap semiconductor layer has p-type conductivity and forms a p-n junction between layers of semiconductors, Moreover, on two opposite sides of the thermoelectric LED there are contacts with the possibility of attaching connecting wires to them for inclusion in the electrical circuit; one of the contacts, on the side of the direct-gap semiconductor layer, is translucent.
- the thermoelectric LED contains a graded-gap semiconductor grown on the base with a decreasing work function in the direction of growth of the epitaxial structure throughout the composition range and an epitaxial layer of a direct-gap semiconductor grown on the graded-gap semiconductor, wherein the base contains a semiconductor material with a p-type conductivity with a work function equal to or close to the work function of the adjacent semiconductor material layer of a graded-gap semiconductor, a graded-gap semiconductor is a graded-gap p-n structure with smooth doping from p type to n type, and a direct-gap semiconductor layer has a conductivity p -type and forms a p-n junction between layers of semiconductors, while on two opposite sides of the thermoelectric LED there are contacts with the possibility of attaching connecting wires to them for inclusion in the electrical circuit, one of the contacts, on the side of the direct-gap semiconductor layer, is translucent
- the work function of the first connecting conductor is the same as or as close as possible to the work function of the semiconductor material of the base, and the work function of the second connecting conductor is the same or as close as possible to the work function of the semiconductor material of the structure adjacent to the conductor through the contact.
- the base is a substrate made of semiconductor material.
- the base is a metal structure with semiconductor material deposited thereon.
- the metal layer of the structure is the contact.
- the base is a structure comprising a metal layer coated with a varying structure from a metal to a semiconductor material.
- the metal layer of the structure is the contact.
- thermoelectric LED the structure of which is schematically illustrated in FIG. 1. Arrows indicate the possible direction of radiation.
- the main element of the thermoelectric LED is a graded-gap semiconductor (2) grown on the base (1) with a decreasing work function in the direction of growth of the epitaxial structure throughout the entire range of compositions and grown on the graded-gap semiconductor, on top, of an epitaxial layer of direct-gap semiconductor (3), which forms a heterojunction between layers.
- the base (1) contains an n-type semiconductor material with a work function equal to or close to the work function of an adjacent graded-gap semiconductor semiconductor material layer.
- Varigap semiconductor (2) has n-type conductivity.
- the growth of the graded-gap semiconductor structure begins with a semiconductor that has a large work function (the same or as close as possible to the work function of the base material), and ends with a semiconductor that has a lower work function compared to the first layer.
- An epitaxial layer of semiconductor (3) is grown on top, which has hole-type conductivity (p-type conductivity) with a higher work function and the formation of a heterojunction between the layers.
- the structure of such a LED may look like this: an InAs base with n-type conductivity, a graded-gap semiconductor with n-type conductivity InAs -GaAs, a layer of direct-gap GaAs semiconductor with p-type conductivity.
- the base (1) contains a p-type semiconductor material with a work function equal to or close to the work function of an adjacent graded-gap semiconductor semiconductor material layer.
- a graded-gap semiconductor is a graded-gap p-n structure with smooth doping from the p type at the point of contact with the base (1) to the n type in the opposite region.
- the growth of the graded-gap semiconductor structure begins with a semiconductor that has a large work function (the same or as close as possible to the work function of the base material), and ends with a semiconductor that has a lower work function compared to the first layer.
- An epitaxial layer of semiconductor (3) is grown on top, which has hole-type conductivity (p-type conductivity) with a higher work function and the formation of a heterojunction between the layers.
- the structure of such an LED may look like this: an InAs base with p-type conductivity, a graded-gap semiconductor with smooth doping from p type at the point of contact with the base to n type in the opposite InAs-GaAs region, a layer of direct-gap GaAs semiconductor with p-type conductivity .
- the main materials of semiconductor emitters are gallium arsenide (GaAs) and ternary compounds based on it (GaAIAs and GaAsP) belong to direct-gap semiconductors , i.e. to those in which direct optical zone-to-zone transitions are allowed. Each recombination of a charge carrier during such a transition is accompanied by the emission of a photon.
- Direct-gap semiconductors are semiconductors in which the transition of an electron between the conduction band and the valence band is not accompanied by a change in momentum (direct transition), and in which, during recombination, the probability of photon emission is higher than the probability of the appearance of a phonon.
- Variband semiconductors can be produced by gas-phase epitaxy.
- Varigap semiconductor (2) may consist of two or more semiconductor materials.
- a substrate (1) is used, made of a semiconductor material of electronic conductivity type or hole conductivity type, depending on the option of growing the semiconductor structure of the LED.
- a metal base with a layer of semiconductor material of the corresponding type of conductivity deposited on it can also be used.
- the application of semiconductor material can be carried out using known technological methods: sputtering, diffusion, deposition and others.
- the base is a structure comprising a metal layer coated thereon with a varying structure from a metal to a semiconductor material of the appropriate type.
- thermoelectric LED Both sides of the thermoelectric LED are made with contacts (4) with the ability to connect connecting wires to them to connect the thermoelectric LED to the electrical circuit.
- One of the contacts is made translucent, and the other has varying degrees of transparency for the unhindered transmission of generated photons.
- the contacts (4) if a substrate made of semiconductor material is used as the base, the contacts can be ohmic and represent permanently connected horizontally oriented plates to the external surfaces of the graded-gap semiconductor.
- the base is the contact.
- the metal layer acts as a contact.
- thermoelectric LED To make an electrical connection of the thermoelectric LED to an external electrical circuit, a connecting conductor is attached to each contact.
- the first connecting conductor is connected to the first contact of the thermoelectric LED, located at the end of the thermoelectric LED, and the second connecting conductor is connected to the second contact, located at the other end of the thermoelectric LED.
- thermoelectric LED works as follows.
- the contacts of connecting conductors A and B are connected, for example, to a current-voltage converter, forming an electrical circuit.
- the thermoelectric LED is supplied with direct current.
- the electron under the influence of an external field, moves to the region of the graded-gap semiconductor with a lower work function. Since the work function decreases monotonically, in order to occupy a place with a lower work function, the electron needs to receive energy from the outside; it draws part of this energy from the applied external field, and part from the thermal vibration of the crystal lattice (phonons).
- the electron having entered the region of the p-n junction, recombines in the region of a direct-gap semiconductor with p-type conductivity, generating a photon of the corresponding energy, which, in turn, leaves the structure of the thermoelectric LED. Then the electron, under the influence of an external field, passes through the valence band of the direct-gap semiconductor of p-type conductivity and the contact enters conductor B.
- the work function of conductor B is selected in such a way as to best match the work function of the contact and the work function of the direct-gap semiconductor of p-type conductivity.
- the sum of the energies of the electron in wire B and the energy of the photon is greater than the energy of the electron in wire A. As a result, a cooling effect occurs.
- LED structures were grown and studied based on a new active region design in which a graded-gap semiconductor was grown on basis in such a way that the work function changes in the direction of growth of the epitaxial structure over the entire range of compositions, and a layer of direct-gap semiconductor material is grown on a given semiconductor.
- This design has been shown to provide a cooling effect when current of a certain polarity is passed through it.
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Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/RU2022/000120 WO2023200354A1 (ru) | 2022-04-15 | 2022-04-15 | Термоэлектрический светодиод |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/RU2022/000120 WO2023200354A1 (ru) | 2022-04-15 | 2022-04-15 | Термоэлектрический светодиод |
Publications (1)
Publication Number | Publication Date |
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WO2023200354A1 true WO2023200354A1 (ru) | 2023-10-19 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/RU2022/000120 WO2023200354A1 (ru) | 2022-04-15 | 2022-04-15 | Термоэлектрический светодиод |
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WO (1) | WO2023200354A1 (ru) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU1428141A1 (ru) * | 1986-09-09 | 1995-05-10 | Физико-технический институт им.А.Ф.Иоффе | Светоизлучающий диод |
RU2154324C1 (ru) * | 1999-04-27 | 2000-08-10 | Матвеев Борис Анатольевич | Полупроводниковый источник инфракрасного излучения (варианты) |
WO2015181657A1 (en) * | 2014-05-27 | 2015-12-03 | The Silanna Group Pty Limited | Advanced electronic device structures using semiconductor structures and superlattices |
US20160111618A1 (en) * | 2014-05-07 | 2016-04-21 | Sensor Electronic Technology, Inc. | Optoelectronic device including improved thermal management |
-
2022
- 2022-04-15 WO PCT/RU2022/000120 patent/WO2023200354A1/ru active IP Right Grant
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU1428141A1 (ru) * | 1986-09-09 | 1995-05-10 | Физико-технический институт им.А.Ф.Иоффе | Светоизлучающий диод |
RU2154324C1 (ru) * | 1999-04-27 | 2000-08-10 | Матвеев Борис Анатольевич | Полупроводниковый источник инфракрасного излучения (варианты) |
US20160111618A1 (en) * | 2014-05-07 | 2016-04-21 | Sensor Electronic Technology, Inc. | Optoelectronic device including improved thermal management |
WO2015181657A1 (en) * | 2014-05-27 | 2015-12-03 | The Silanna Group Pty Limited | Advanced electronic device structures using semiconductor structures and superlattices |
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