CN108417662A - A kind of included signal amplifying function gallium nitride base ray detector and preparation method thereof - Google Patents

A kind of included signal amplifying function gallium nitride base ray detector and preparation method thereof Download PDF

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CN108417662A
CN108417662A CN201810442209.1A CN201810442209A CN108417662A CN 108417662 A CN108417662 A CN 108417662A CN 201810442209 A CN201810442209 A CN 201810442209A CN 108417662 A CN108417662 A CN 108417662A
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gan
layers
drift layer
ray detector
gallium nitride
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CN108417662B (en
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卢星
任远
赵维
陈志涛
刘晓燕
龚政
黎子兰
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Guangdong Semiconductor Industry Technology Research Institute
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/08Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof in which radiation controls flow of current through the device, e.g. photoresistors
    • H01L31/10Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof in which radiation controls flow of current through the device, e.g. photoresistors characterised by potential barriers, e.g. phototransistors
    • H01L31/101Devices sensitive to infrared, visible or ultraviolet radiation
    • H01L31/102Devices sensitive to infrared, visible or ultraviolet radiation characterised by only one potential barrier
    • H01L31/108Devices sensitive to infrared, visible or ultraviolet radiation characterised by only one potential barrier the potential barrier being of the Schottky type
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/18Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
    • H01L31/184Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof the active layers comprising only AIIIBV compounds, e.g. GaAs, InP
    • H01L31/1844Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof the active layers comprising only AIIIBV compounds, e.g. GaAs, InP comprising ternary or quaternary compounds, e.g. Ga Al As, In Ga As P
    • H01L31/1848Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof the active layers comprising only AIIIBV compounds, e.g. GaAs, InP comprising ternary or quaternary compounds, e.g. Ga Al As, In Ga As P comprising nitride compounds, e.g. InGaN, InGaAlN
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product

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  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
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Abstract

The invention discloses a kind of included signal amplifying function gallium nitride base ray detectors and preparation method thereof, belong to technical field of semiconductor device.A kind of ray detector of the present invention, including:GaN base PN junction and high electron mobility transistor;The GaN base PN junction includes the back electrode stacked gradually, P GaN layers and nGaN drift layer, the nGaN drift layer generates electron hole pair for absorbing x ray irradiation x;The channel layer and n of the high electron mobility transistorSurface electrical behavior connection of the GaN drift layer far from P GaN layers.The high electron mobility transistor includes the channel layer stacked gradually, the barrier layers AlN and AlGaN potential barrier;The channel layer is GaN channel layers, the surface far from the barrier layers AlN and nGaN drift layer is electrically connected;Surface of the AlGaN potential barrier far from the barrier layers AlN is respectively equipped with source electrode, drain and gate.Detector of the present invention realizes the ray detector of included signal amplifying function, and high sensitivity, fast response time, signal-to-noise ratio are high, and preparation process is simple and reliable.

Description

A kind of included signal amplifying function gallium nitride base ray detector and preparation method thereof
Technical field
The present invention relates to field of semiconductor devices, and in particular to a kind of included signal amplifying function gallium nitride base X-ray detection X Device and preparation method thereof.
Background technology
Gallium nitride material is a kind of direct band-gap semicondictor, and due to having, energy gap is big, electron mobility is high, breakdown field The features such as strong high is current ideal radiation resistance and fast-response X-ray detection X material, in cosmic ray detection, high energy acceleration There is wide answer in the fields such as the detection of particle head-on collision product, nuclear fission and nuclear fusion radiation detection, medical diagnosis and industrial detection Use foreground.
Highly sensitive, low noise and fast-response are three important indicators of ray detector.Current ray detecting system Mostly use sensitive detection parts and signal amplification circuit cascade pattern, including charge sensitive preamplifier, spectroscope amplifier etc..By Usually realize that Radiation hardness is weaker by si-substrate integrated circuit in signal amplification circuit, so spatially locating with sensitive detection parts In isolation, the problems such as response speed of ray detecting system is slow, sensitivity is low and poor signal to noise is inevitably caused.
Therefore, there is an urgent need for develop a kind of to overcome the prior art to be deposited per se with the X-ray detection X device of signal amplifying function Deficiency.
Invention content
In order to solve the above-mentioned problems of the prior art, present invention aims at provide a kind of included signal amplifying function Gallium nitride base ray detector and preparation method thereof.
A kind of included signal amplifying function gallium nitride base ray detector of the present invention, including:GaN base PN junction and height Electron mobility transistor;The GaN base PN junction includes the back electrode stacked gradually, P-GaN layers and n-GaN drift layer, institute State n-GaN drift layer generates electron hole pair for absorbing x ray irradiation x;The channel layer of the high electron mobility transistor With n-GaN drift layer is connected far from P-GaN layers of surface electrical behavior.
Preferably, the high electron mobility transistor includes the channel layer stacked gradually, the barrier layers AlN and AlGaN gesture Barrier layer;The channel layer is GaN channel layers, the surface far from the barrier layers AlN and n-GaN drift layer is electrically connected;AlGaN gesture Surface of the barrier layer far from the barrier layers AlN is respectively equipped with source electrode, drain and gate, the drain electrode and the source electrode respectively with it is described AlGaN potential barrier surface Ohmic contact;The grid is Schottky contacts with the AlGaN potential barrier surface.
Preferably, P-GaN layers of the doping concentration is 1 × 1017cm-3To 1 × 1019cm-3
Preferably, P-GaN layers of the thickness is 0.1 μm to 1 μm.
Preferably, the n-The doping concentration of GaN drift layer is 1 × 1015cm-3To 1 × 1018cm-3
Preferably, the n-The thickness of GaN drift layer is 10 μm to 1cm.
A method of preparing a kind of included signal amplifying function gallium nitride base ray detector, which is characterized in that Include the following steps:
(1) circular wafer is prepared:In n-The upper surface epitaxial growth GaN channel layers of-GaN self-supported substrates, the barrier layers AlN and AlGaN potential barrier forms the heterojunction structure of high electron mobility transistor;From lower surface to n-- GaN self-supported substrates carry out It is thinned, is used in combination the method for epitaxial growth or Mg ion implantings to form P-GaN layers, the n-- GaN self-supported substrates itself formation n-Circular wafer is made in GaN drift layer;
(2) drain electrode and source electrode are prepared:The deposited metal on the AlGaN potential barrier upper surface, with the AlGaN potential barrier Upper surface forms Ohmic contact, and drain electrode and source electrode is made;
(3) grid is prepared:The deposited metal on the AlGaN potential barrier upper surface, with the AlGaN potential barrier upper surface Schottky contacts are formed, grid is made;
(4) back electrode is prepared:In the P-GaN layers of lower surface deposited metal, ohm is formed with the lower surface P-GaN layers of Back electrode is made in contact.
A kind of included signal amplifying function gallium nitride base ray detector of the present invention and preparation method thereof, advantage It is, a kind of included signal amplifying function gallium nitride base ray detector of the present invention passes through after absorbing x ray irradiation x The PN junction of reverse bias acts on, and the electric signal of amplification is outputed through high electron mobility transistor.It realizes and amplifies from band signal Function no longer needs to the other signal amplification circuit of optional equipment, with high sensitivity, fast response time and high excellent of signal-to-noise ratio Point.In addition, the present invention can be made by the preparation process of conventional gallium nitride based electronic device, preparation process is simple and reliable, system It is standby at low cost.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of included signal amplifying function gallium nitride base ray detector of the present invention;
Fig. 2 is the flow diagram of the present invention for preparing circular wafer;
Fig. 3 is the flow diagram of the present invention for preparing source electrode and drain electrode;
Fig. 4 is the flow diagram of the present invention for preparing grid;
Fig. 5 is the flow diagram of the present invention for preparing back electrode.
Reference sign in figure:101, back electrode, 102, P-GaN layers, 103, n-GaN drift layer, 104, GaN raceway grooves Layer, 105, the barrier layers AlN, 106, AlGaN potential barrier, 107, source electrode, 108, drain electrode, 109, grid, 110, electronics, 111, empty Cave, 112, ray.
Specific implementation mode
As shown in Figure 1, a kind of included signal amplifying function gallium nitride base ray detector of the present invention.Including under And back electrode 101, P-GaN layers 102, the n of upper stacking-GaN drift layer 103, GaN channel layers 104,105 and of the barrier layers AlN AlGaN potential barrier 106 and the source electrode 107 being arranged on 106 upper surface of AlGaN potential barrier, drain electrode 108, grid 109.P-GaN Layer 102, n-GaN drift layer 103 constitutes the PN junction of reverse bias, n-After GaN drift layer 103 is for absorbing the irradiation of ray 112 Generate electron hole pair.GaN channel layers 104, the barrier layers AlN 105, AlGaN potential barrier 106, source electrode 107, drain electrode 108 and grid 109 constitute high electron mobility efficiency crystalline pipe, and drain electrode 108 and source electrode 107 are arranged in 109 both sides of grid.n-- GaN floats Layer 103 is moved after absorbing ray 112 and irradiating, is acted on by reverse biased PN junction, then exported via high electron mobility transistor, Realize the amplification output to signal.A kind of included signal amplifying function gallium nitride base ray detector of the present invention, it is real Show the function of included amplified signal, the signal amplification circuit other without optional equipment, high sensitivity, fast response time and letter It makes an uproar than high.
In order to by n-The irradiation of ray 112 that GaN drift layer 103 absorbs is converted to electric signal and passes to high electron mobility effect Rate transistor exports, GaN channel layers 104 and n-It is electric connection between GaN drift layer 103.
The doping concentration of P-GaN layers 102 is 1 × 1017cm-3To 1 × 1019cm-3, thickness is 0.1 μm to 1 μm.
n-The doping concentration of GaN drift layer 103 is 1 × 1015cm-3To 1 × 1018cm-3, thickness is 10 μm to 1cm.
Drain electrode 108 and source electrode 107 are Ohmic contact with 106 upper surface of the AlGaN potential barrier.
Grid 109 is Schottky contacts with 106 upper surface of the AlGaN potential barrier.
Back electrode 101 is Ohmic contact with 102 lower surface of P-GaN layers
A method of preparing a kind of included signal amplifying function gallium nitride base ray detector, including following step Suddenly:
As shown in Fig. 2, in n-The upper surface epitaxial growth GaN channel layers 104 of-GaN self-supported substrates, the barrier layers AlN 105 With AlGaN potential barrier 106, the heterojunction structure of high electron mobility transistor is formed;From lower surface to n-- GaN self-supportings serve as a contrast Bottom is thinned, and the method for epitaxial growth or Mg ion implantings is used in combination to form P-GaN layers 102, the n-- GaN self-supportings serve as a contrast Bottom itself forms n-GaN drift layer 103;
As shown in figure 3, the deposited metal on 106 upper surface of AlGaN potential barrier, forms with 106 upper surface of AlGaN potential barrier Drain electrode 108 and source electrode 107 is made in Ohmic contact;
As shown in figure 4, the deposited metal on 106 upper surface of AlGaN potential barrier, forms with 106 upper surface of AlGaN potential barrier Grid 109 is made in Schottky contacts;
As shown in figure 5, in 102 lower surface deposited metal of P-GaN layers, Ohmic contact is formed with 102 lower surface of P-GaN layers, Back electrode 101 is made;
Device is cut separation from circular wafer to complete to prepare.
The present embodiment propose a kind of included signal amplifying function gallium nitride base ray detector at work, n-- GaN floats It moves layer 103 and absorbs the irradiation of ray 112, generate electron hole pair.Back electrode 101, P-GaN layers 102, n-103 structure of GaN drift layer At PN junction reverse bias.n-The electron hole pair generated in GaN drift layer 103 is detached by the effect of reverse bias voltage, It is separated into positively charged hole 111 and negatively charged electronics 110.The drift of electronics 110 of separation enters GaN channel layers 104, Hole 111 enters P-GaN layers 102.Electronics 110 enters GaN channel layers 104, acts on the raceway groove of high transport efficiency transistor, The electric conductivity of its raceway groove is modulated, and then the electric conductivity of entire high electron mobility transistor is modulated.Ray 112 The electric signal being exaggerated is converted to through this process to export from high electron mobility transistor.Realize included signal amplifying function nitrogen Change gallium base ray detector and has the ray detector that need to configure additional amplifying circuit without being equipped with additional amplifying circuit The high advantage of the high sensitivity, fast response time and the signal-to-noise ratio that do not have.The present embodiment proposes a kind of from band signal amplification work( Energy gallium nitride base ray detector can be made by the preparation process of conventional gallium nitride based electronic device, and preparation process simply may be used It leans on, manufacturing cost is low.
For those skilled in the art, technical solution that can be as described above and design are made other each The corresponding change of kind and deformation, and all these changes and deformation should all belong to the protection model of the claims in the present invention Within enclosing.

Claims (7)

1. a kind of included signal amplifying function gallium nitride base ray detector, which is characterized in that including:GaN base PN junction and height electricity Transport factor transistor;The GaN base PN junction includes the back electrode (101) stacked gradually, P-GaN layers (102) and n--GaN Drift layer (103), the n-GaN drift layer (103) generates electron hole pair for absorbing ray (112) irradiation;The height The channel layer and n of electron mobility transistor-Surface electrical behavior of the GaN drift layer (103) far from P-GaN layers (102) connects.
2. a kind of included signal amplifying function gallium nitride base ray detector according to claim 1, which is characterized in that described High electron mobility transistor includes the channel layer stacked gradually, the barrier layers AlN (105) and AlGaN potential barrier (106);It is described Channel layer is GaN channel layers (104), the surface far from the barrier layers AlN (105) and n-GaN drift layer (103) is electrically connected; Surface of the AlGaN potential barrier (106) far from the barrier layers AlN (105) is respectively equipped with source electrode (107), drain electrode (108) and grid (109), the drain electrode (108) and the source electrode (107) respectively with the AlGaN potential barrier (106) surface Ohmic contact;Institute It is Schottky contacts that grid (109), which is stated, with the AlGaN potential barrier (106) surface.
3. a kind of included signal amplifying function gallium nitride base ray detector according to claim 1, which is characterized in that described The doping concentration of P-GaN layers (102) is 1 × 1017cm-3To 1 × 1019cm-3
4. a kind of included signal amplifying function gallium nitride base ray detector according to claim 1, which is characterized in that described The thickness of P-GaN layers (102) is 0.1 μm to 1 μm.
5. a kind of included signal amplifying function gallium nitride base ray detector according to claim 1, which is characterized in that described n-The doping concentration of GaN drift layer (103) is 1 × 1015cm-3To 1 × 1018cm-3
6. a kind of included signal amplifying function gallium nitride base ray detector according to claim 1, which is characterized in that described n-The thickness of GaN drift layer (103) is 10 μm to 1cm.
7. a kind of preparing a kind of any sides of included signal amplifying function gallium nitride base ray detector claim 1-6 Method, which is characterized in that include the following steps:
(1) circular wafer is prepared:In n-The upper surface epitaxial growth GaN channel layers (104) of-GaN self-supported substrates, the barrier layers AlN (105) and AlGaN potential barrier (106), the heterojunction structure of high electron mobility transistor is formed;From lower surface to n-- GaN is certainly Support substrate is thinned, and the method for epitaxial growth or Mg ion implantings is used in combination to form P-GaN layers (102), the n--GaN Self-supported substrate itself forms n-Circular wafer is made in GaN drift layer (103);
(2) drain electrode (108) and source electrode (107) are prepared:The deposited metal on the AlGaN potential barrier (106) upper surface, and it is described AlGaN potential barrier (106) upper surface forms Ohmic contact, and drain electrode (108) and source electrode (107) is made;
(3) grid (109) is prepared:The deposited metal on the AlGaN potential barrier (106) upper surface, with the AlGaN potential barrier (106) upper surface forms Schottky contacts, and grid (109) is made;
(4) back electrode (101) is prepared:In P-GaN layers described (102) lower surface deposited metal, and under P-GaN layers described (102) Surface forms Ohmic contact, and back electrode (101) is made.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110047956A (en) * 2019-04-25 2019-07-23 南京大学 Planes AlGaN base schottky type ultraviolet detector such as non-with light blocking layer and preparation method thereof

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JPH0237746A (en) * 1988-07-28 1990-02-07 Fujitsu Ltd Semiconductor device
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US5432470A (en) * 1991-08-02 1995-07-11 Sumitomo Electric Industries, Ltd. Optoelectronic integrated circuit device
JP2000340826A (en) * 1999-05-27 2000-12-08 Denso Corp High electron mobility phototransistor
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US20040079961A1 (en) * 2002-10-25 2004-04-29 The University Of Connecticut Photonic digital-to-analog converter employing a plurality of heterojunction thyristor devices
CN208157438U (en) * 2018-05-10 2018-11-27 广东省半导体产业技术研究院 A kind of included signal amplifying function gallium nitride base ray detector

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Publication number Priority date Publication date Assignee Title
EP0272372A1 (en) * 1986-12-24 1988-06-29 Licentia Patent-Verwaltungs-GmbH Method of making a monolithic integrated photodetector
JPH0237746A (en) * 1988-07-28 1990-02-07 Fujitsu Ltd Semiconductor device
EP0392480A2 (en) * 1989-04-12 1990-10-17 Sumitomo Electric Industries, Ltd. Method of manufacturing a semiconductor integrated circuit device
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110047956A (en) * 2019-04-25 2019-07-23 南京大学 Planes AlGaN base schottky type ultraviolet detector such as non-with light blocking layer and preparation method thereof
CN110047956B (en) * 2019-04-25 2020-12-01 南京大学 Non-isoplanar AlGaN-based Schottky type ultraviolet detector with light blocking layer and preparation method thereof

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