WO2004109782A1 - 窒化物系半導体素子及びその製造方法 - Google Patents
窒化物系半導体素子及びその製造方法 Download PDFInfo
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- WO2004109782A1 WO2004109782A1 PCT/JP2004/007849 JP2004007849W WO2004109782A1 WO 2004109782 A1 WO2004109782 A1 WO 2004109782A1 JP 2004007849 W JP2004007849 W JP 2004007849W WO 2004109782 A1 WO2004109782 A1 WO 2004109782A1
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 235
- 150000004767 nitrides Chemical class 0.000 title claims abstract description 150
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 238000000034 method Methods 0.000 title abstract description 14
- 239000000872 buffer Substances 0.000 claims abstract description 158
- 239000000758 substrate Substances 0.000 claims abstract description 118
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 115
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 114
- 239000010703 silicon Substances 0.000 claims abstract description 114
- 239000000956 alloy Substances 0.000 claims abstract description 43
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 43
- 229910052733 gallium Inorganic materials 0.000 claims abstract description 37
- 239000012535 impurity Substances 0.000 claims abstract description 27
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 26
- 229910052738 indium Inorganic materials 0.000 claims abstract description 25
- 230000004888 barrier function Effects 0.000 claims description 24
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 claims description 22
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 21
- 229910052751 metal Inorganic materials 0.000 claims description 21
- 239000002184 metal Substances 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 13
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims description 10
- 210000000746 body region Anatomy 0.000 claims description 9
- 230000005669 field effect Effects 0.000 claims description 9
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 9
- 230000008569 process Effects 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 268
- 229910002601 GaN Inorganic materials 0.000 description 15
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 15
- 238000005036 potential barrier Methods 0.000 description 13
- 230000015572 biosynthetic process Effects 0.000 description 11
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 10
- 239000007789 gas Substances 0.000 description 9
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 8
- 229910052796 boron Inorganic materials 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 8
- 230000002093 peripheral effect Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 5
- 229910000077 silane Inorganic materials 0.000 description 5
- 229910021529 ammonia Inorganic materials 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- 229910052594 sapphire Inorganic materials 0.000 description 4
- 239000010980 sapphire Substances 0.000 description 4
- 238000005253 cladding Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000020169 heat generation Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 3
- 229910001887 tin oxide Inorganic materials 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- NWAIGJYBQQYSPW-UHFFFAOYSA-N azanylidyneindigane Chemical compound [In]#N NWAIGJYBQQYSPW-UHFFFAOYSA-N 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000000407 epitaxy Methods 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 150000002344 gold compounds Chemical group 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 description 2
- XCZXGTMEAKBVPV-UHFFFAOYSA-N trimethylgallium Chemical compound C[Ga](C)C XCZXGTMEAKBVPV-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229910003437 indium oxide Inorganic materials 0.000 description 1
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- IBEFSUTVZWZJEL-UHFFFAOYSA-N trimethylindium Chemical compound C[In](C)C IBEFSUTVZWZJEL-UHFFFAOYSA-N 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 238000000927 vapour-phase epitaxy Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/02—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies
- H01L33/12—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies with a stress relaxation structure, e.g. buffer layer
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- 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
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02367—Substrates
- H01L21/0237—Materials
- H01L21/02373—Group 14 semiconducting materials
- H01L21/02381—Silicon, silicon germanium, germanium
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- 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
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02436—Intermediate layers between substrates and deposited layers
- H01L21/02439—Materials
- H01L21/02455—Group 13/15 materials
- H01L21/02458—Nitrides
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- 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
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02436—Intermediate layers between substrates and deposited layers
- H01L21/02439—Materials
- H01L21/02491—Conductive materials
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- 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
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02436—Intermediate layers between substrates and deposited layers
- H01L21/02494—Structure
- H01L21/02496—Layer structure
- H01L21/02505—Layer structure consisting of more than two layers
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- 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
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02436—Intermediate layers between substrates and deposited layers
- H01L21/02494—Structure
- H01L21/02496—Layer structure
- H01L21/02505—Layer structure consisting of more than two layers
- H01L21/02507—Alternating layers, e.g. superlattice
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- 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
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02518—Deposited layers
- H01L21/02521—Materials
- H01L21/02538—Group 13/15 materials
- H01L21/0254—Nitrides
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02612—Formation types
- H01L21/02617—Deposition types
- H01L21/0262—Reduction or decomposition of gaseous compounds, e.g. CVD
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- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/70—Bipolar devices
- H01L29/72—Transistor-type devices, i.e. able to continuously respond to applied control signals
- H01L29/73—Bipolar junction transistors
- H01L29/737—Hetero-junction transistors
- H01L29/7371—Vertical transistors
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- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/12—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/20—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed including, apart from doping materials or other impurities, only AIIIBV compounds
- H01L29/2003—Nitride compounds
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- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/02—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies
- H01L33/14—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies with a carrier transport control structure, e.g. highly-doped semiconductor layer or current-blocking structure
Definitions
- the present invention relates to a nitride semiconductor device and a method for manufacturing the same.
- the present invention relates to a nitride semiconductor such as a light emitting diode (LED) and a transistor.
- a nitride semiconductor such as a light emitting diode (LED) and a transistor.
- the present invention relates to a conductor element and a method for manufacturing the same.
- the substrate for forming the nitride-based semiconductor device is made of sapphire, silicon carbide, or silicon.
- Silicon substrates have the advantage that they are easier to cut than sapphire substrates and silicon carbide substrates, and that they can be reduced in cost.
- a silicon substrate can have conductivity that cannot be obtained with a sapphire substrate. Therefore, the silicon substrate can be used as a current path.
- a relatively large voltage drop occurs due to a potential barrier between the silicon substrate and the nitride semiconductor, and the driving voltage of the light emitting diode becomes relatively high.
- Patent Document 1 discloses a technique for solving the above-mentioned drawbacks in a silicon substrate.
- an A 1 N (aluminum nitride) layer serving as a buffer layer, an n-type InGaN (gallium indium nitride) layer having the same conductivity type as a silicon substrate are provided on an n-type silicon substrate.
- An n-type GaN (gallium nitride) layer, an active layer composed of InGaN, and a p-type GaN layer are sequentially grown by epitaxy.
- In and Ga of the InGaN layer and Al of the A1N layer diffuse into the silicon substrate, and the Ga, In, A1 and S1 are formed on the surface region of the silicon substrate.
- An alloy layer i.e., a gold compound region, consisting of i. This alloy layer has the function of lowering the potential barrier at the semiconductor junction between silicon and A 1 N. As a result, it is possible to lower the drive voltage when a predetermined current flows through the light emitting diode, and reduce power loss As a result, the efficiency of the light emitting diode is improved.
- A1N layer and the n-type InGaN layer diffuse into the n-type silicon substrate.
- Group III elements such as Al, In, and Ga function as p-type impurities with respect to silicon, so that a p-type region is formed on the surface of the n-type silicon substrate, and pn is formed in the silicon substrate. Bonding occurs.
- This pn junction produces a forward voltage drop of about 0.6 V.
- the potential barrier between the silicon substrate and the nitride semiconductor is relatively large, and the voltage drop of the light emitting diode, that is, the driving voltage is about 1.2 times higher than that of the light emitting diode using the sapphire substrate.
- a transparent electrode made of, for example, a mixture of indium oxide and tin oxide is provided on the surface of a semiconductor region having a light emitting function, and a bonding pad for connecting a wire or the like to a substantially center on the surface of the transparent electrode.
- the transparent electrode is a thin conductor film having a thickness of, for example, about 10 nm, the metal material of the bonding pad electrode diffuses into the transparent electrode or both the transparent electrode and the semiconductor region, and the semiconductor region and the bonding pad electrode are in contact with each other. A short-circuit barrier is formed between the two.
- the Schottky barrier has a function of blocking a forward current of the light emitting diode, a current flowing in a portion of the semiconductor region below the bonding pad electrode is suppressed, and a current in an outer peripheral portion of the semiconductor region increases. Is done.
- the forward drive voltage of the light emitting diode is increased by using the n-type silicon substrate, the power loss in the silicon substrate and the semiconductor region is also increased, and the amount of heat generated is also increased.
- the characteristics of the Schottky barrier deteriorate, the leakage current passing through the Schottky barrier increases, and conversely, the current on the outer peripheral side decreases.
- the bonding pad is light-impermeable, Even if the amount of light emitted inside the center of the region increases, the amount of light extracted outside hardly increases.
- the current in the outer peripheral portion of the semiconductor region decreases, the amount of light emitted inside the outer peripheral portion of the semiconductor region decreases, and the amount of light extracted outside via the transparent electrode also decreases. For this reason, it was not possible to obtain a light emitting diode having high light emitting efficiency using an n-type silicon substrate.
- a light emitting diode in which a current block layer made of an insulating material is provided between the bonding pad electrode and the semiconductor region in order to limit the current below the bonding pad electrode is known. A special process for forming the current block layer is required, which inevitably increases the cost of the light emitting diode. Disclosure of the invention
- An object of the present invention is to reduce a voltage drop and a driving voltage of a nitride semiconductor device using a silicon substrate.
- a buffer region including at least one n-type nitride semiconductor layer disposed on the alloy layer;
- a first electrode connected to the main semiconductor region
- a second electrode connected to the other main surface of the p-type silicon substrate
- the present invention relates to a nitride-based semiconductor device, comprising:
- the main part of the semiconductor element means an active part or an active part of the semiconductor element.
- the semiconductor element may have another electrode in addition to the first and second electrodes.
- the main semiconductor It is desirable to include at least the active layer and the p-type nitride semiconductor layer in the body region.
- the main semiconductor region includes at least a p-type base region and an n-type emitter region.
- the main semiconductor region includes at least a p-type body region and an n-type source region.
- the alloy layer desirably has a function of generating electrons and holes at or near the interface with the p-type silicon substrate and recombining the electrons and holes.
- the alloy layer is an alloy layer of gallium, aluminum, aluminum and silicon.
- the buffer region includes a first buffer layer made of a nitride semiconductor containing at least aluminum and formed on the alloy layer, and at least a gallium formed on the first buffer layer. And a second buffer layer made of an n-type nitride semiconductor containing a semiconductor.
- the first buffer layer in the buffer area is the first buffer layer in the buffer area
- the first buffer layer in the buffer region is an aluminum nitride layer having a thickness of 211111 to 6111111.
- the second buffer layer in the buffer area includes:
- the second buffer layer in the buffer region is made of an n-type nitride semiconductor containing indium and gallium.
- the buffer region further has a multi-layer buffer region on the second buffer layer, and the multi-layer buffer region is a nitride containing A 1 (aluminum) in a first ratio.
- a plurality of first layers comprising a semiconductor; and a plurality of second layers comprising a nitride semiconductor not containing A 1 or containing a second proportion smaller than the first proportion, wherein the first It is preferable that the layers and the second layers are alternately stacked.
- the main semiconductor region is a region for forming a light emitting diode, and has at least an active layer and a p-type nitride semiconductor layer disposed on the active layer.
- the anode electrode is electrically connected to the p-type nitride semiconductor layer, and the second electrode is a cathode electrode.
- the first electrode includes a light-transmitting conductive film electrically connected to the p-type nitride semiconductor layer and a connection metal layer formed on a part of the surface of the conductive film. Preferably.
- connection metal layer is desirably made of a material capable of forming a Schottky barrier between the connection metal layer and the p-type nitride semiconductor layer.
- the nitride-based semiconductor element further includes an n-type auxiliary nitride semiconductor layer disposed between the p-type nitride semiconductor layer and the conductive film.
- the main semiconductor region is a region for forming a transistor, has at least a p-type base region and an n-type emitter region, and the first electrode is electrically connected to the n-type emitter region.
- -It is desirable to have a source electrode.
- the main semiconductor region is a region for forming an insulated gate field effect transistor, and has at least a p-type body region and an n-type source region arranged adjacent to the p-type body region.
- the first electrode is a source electrode electrically connected to the n-type source region
- the second electrode is a drain electrode, and preferably has a gate electrode.
- the method for manufacturing a nitride-based semiconductor device according to the present invention includes a step of preparing a p-type silicon substrate having conductivity;
- the method for manufacturing a nitride-based semiconductor device includes a step of preparing a p-type silicon substrate having conductivity
- an alloy layer containing at least gallium, aluminum, and silicon between the P-type silicon substrate and the first buffer layer.
- a p-type silicon substrate is used despite having a buffer region including an n-type nitride semiconductor layer. Therefore, even if elements of group III such as G a and A 1 contained in the buffer region diffuse into the p-type silicon substrate, these elements are p-type impurities with respect to silicon. p n junction does not occur in the mold silicon substrate.
- the alloy layer has a function of generating electrons and holes at the interface with the p-type silicon substrate and recombining the electrons and holes. As a result, the potential barrier at the heterojunction between the p-type silicon substrate and the n-type buffer region is reduced, and the driving voltage of the semiconductor device can be easily reduced significantly.
- the buffer region is provided, a main semiconductor region with good crystallinity can be obtained.
- a light-transmitting conductive film in which the first electrode of the light-emitting diode is electrically connected to the p-type nitride semiconductor layer and a part of a surface of the conductive film
- the connection metal layer is formed on the semiconductor layer
- a short-circuit barrier is generated between the connection metal layer and the semiconductor region as described above, and the short-circuit barrier is in the order of the light emitting diode. It has the function to block the direction current.
- the power loss and heat generation of the light emitting diode are large, the function of blocking the forward current of the light emitting diode due to the Schottky barrier is reduced.
- FIG. 1 is a sectional view schematically showing a light emitting diode according to Example 1 of the present invention.
- FIG. 2 is a characteristic diagram showing a relationship between forward voltage and current of the light emitting diode of FIG. 1 and a conventional light emitting diode.
- FIG. 3 shows the effect of reducing the driving voltage of the light emitting diode in Fig. 1 in a conventional light emitting diode.
- FIG. 3 is an energy band diagram shown in comparison with an energy band.
- FIG. 4 is a sectional view schematically showing a light emitting diode according to the second embodiment of the present invention.
- FIG. 5 is a sectional view schematically showing a light emitting diode according to the third embodiment of the present invention.
- FIG. 6 is a sectional view schematically showing a light emitting diode according to Example 4 of the present invention.
- FIG. 7 is a sectional view schematically showing a light emitting diode according to Embodiment 5 of the present invention.
- FIG. 8 is a sectional view schematically showing a transistor according to Example 6 of the present invention.
- FIG. 9 is a sectional view schematically showing a field-effect transistor according to Embodiment 7 of the present invention.
- the light emitting diode as the nitride-based semiconductor device according to the first embodiment shown in FIG. 1 includes a p-type silicon substrate 1, an alloy layer 2, a buffer region 3, and a main part of the light emitting diode. It has a main semiconductor region 4 and first and second electrodes 5 and 6.
- the buffer region 3 includes a first buffer layer 11 epitaxially grown on a p-type silicon substrate 1 and an n-type second buffer layer 12.
- the main semiconductor region 4 includes an n-type nitride semiconductor layer 13, an active layer 14, and a p-type nitride semiconductor layer 15 epitaxially grown on the puffer region 3. Light emitted from the active layer 14 is extracted to the outside from the main surface of the main semiconductor region 4 where the first electrode 5 is disposed.
- the p-type silicon substrate 1 is a characteristic feature of the present invention, and despite the fact that the n-type second buffer layer 12 is disposed thereon, the opposite is true. It has conductivity type.
- the silicon substrate 1 is doped with a group 3 element such as B (poron) which functions as a p-type impurity at a concentration of, for example, about 5 ⁇ 10 18 cm—3 to 5 ⁇ 10 19 cm— 3. Have been. Therefore, the silicon substrate 1 is a conductive substrate having a low resistivity of about 0.0001 ⁇ ⁇ o ⁇ to 0.01 ⁇ ⁇ cm, and a current path between the first and second electrodes 6 and 7. It becomes.
- the silicon substrate 1 has a thickness that can function as a mechanical support substrate such as the buffer region 3 and the main semiconductor region 4 thereon, for example, 350 nm.
- the alloy layer 2 on the p-type silicon substrate 1 is an alloy layer of silicon (Si), gallium (Ga), indium (In), and aluminum (A1). Electrons and holes are generated at the interface between the alloy layer 2 and the silicon substrate 1 and at the interface between the alloy layer 2 and the buffer region 3, and recombination of electrons and holes occurs. Therefore, the alloy layer 2 can be called a potential barrier reduction layer, and has a function of lowering a potential barrier generated between the silicon substrate 1 and the buffer region 3. In order to sufficiently obtain the effect of reducing the potential barrier, it is desirable that the alloy layer 2 has an average thickness of 5 nm or more. Note that the alloy layer 2 may have a uniform thickness or a non-uniform thickness. Details of the formation of the alloy layer 2 will be described later.
- the buffer region 3 is disposed on the alloy layer 2 and includes a first buffer layer 11 made of a nitride semiconductor containing A1 (aluminum) at a first ratio, and a first buffer layer 11 containing no A1 or the first buffer layer 11 containing no A1. It is formed in combination with a second buffer layer 12 made of an n-type nitride semiconductor containing a second ratio smaller than 1.
- the first buffer layer 11 is, for example,
- the first buffer layer 11 in the embodiment of FIG. 1 is formed to a thickness of about 3 nm.
- the first buffer layer 11 can be doped with an n-type impurity such as silicon (Si).
- B (boron) can be added to the first buffer layer 11.
- the M is at least one element selected from In (indium) and B (boron),
- the X and y are 0 ⁇ X ⁇ 1,
- the first buffer layer 11 containing A 1 It is desirable that the material is formed of a material whose difference from the lattice constant between the second silicon substrate 1 and the p-type silicon substrate is smaller than the difference between the lattice constant between the second buffer layer 12 and the p-type silicon substrate.
- the first buffer layer 11 has a difference in thermal expansion coefficient between the first buffer layer 11 and the p-type silicon substrate 1 because the second buffer layer 12 or the main semiconductor regions 4 to 4c and the p-type silicon substrate It is desirable in terms of characteristics that the material be smaller than the difference in thermal expansion coefficient between the two.
- the first buffer layer 11 has a function of delaying the start of diffusion of In and Ga contained in the second buffer layer 12 into the silicon substrate 1. To obtain these functions, the first buffer layer 11 preferably has a thickness of 2 nm to 60 nm.
- the second buffer layer 12 of the buffer region 3 is formed of an n-type nitride semiconductor containing at least gallium (Ga), for example,
- the second buffer layer 1 2 of this embodiment having a thickness of 3 0 nm n-type nitride gas re um indium (I n .. 5 G a .. 5 N). Note that B (boron) can be added to the second buffer layer 12.
- M is at least one element selected from In (indium) and B (boron),
- a and b are 0 ⁇ a ⁇ 1
- the composition of the first and second buffer layers 111 changes during the epitaxial growth process due to interdiffusion with adjacent regions. Accordingly, the components of the first and second buffer layers 11.1.2 here indicate these main components.
- the second buffer layer 12 containing G a and I n has a buffer function for forming the main semiconductor region 4 thereon, and also has G a and I n on the silicon substrate 1 during the epitaxial growth process. Has the function of supplying.
- the thickness of the second buffer layer 12 is desirably set to 1 nm or more to supply G a In to the silicon substrate 1 as necessary and sufficient. It is desirable to set the thickness to 500 nm or less in order to prevent 12 cracks.
- the main semiconductor region 4 for the well-known double heterostructure light emitting diode is composed of an n-type nitride semiconductor layer 13, an active layer 14, and a p-type nitride layer sequentially disposed on the second buffer layer 12.
- the n-type nitride semiconductor layer 13 of the main semiconductor region 4 has, for example,
- the ⁇ -type nitride semiconductor layer 13 may be called an ⁇ -type cladding layer of the light emitting diode.
- the active layer 14 is, for example,
- the active layer 14 is formed of gallium indium nitride (InGaN).
- FIG. 1 schematically shows the active layer 14 as a single layer, it actually has a well-known multiple quantum well structure. Needless to say, the active layer 14 can be composed of one layer.
- the active layer 14 is not doped with impurities for determining conductivity type, but may be doped with p-type or n-type impurities.
- Type nitride semiconductor layer 15 has a thickness of 500! ! ! ! ! ! The type
- Type nitride semiconductor layer 15 is sometimes called a ⁇ cladding layer.
- the active layer 14 and the type nitride semiconductor layer 15 constituting the main semiconductor region 4 are formed on the silicon substrate 1 via the buffer region 3, Is relatively good.
- the first electrode 5 functioning as the anode electrode is connected to a part of the surface of the p-type nitride semiconductor layer 15, and the second electrode 6 functioning as the cathode electrode is connected to the lower surface of the p-type silicon substrate 1 ing.
- a contact p-type nitride semiconductor layer is additionally provided on the p-type nitride semiconductor layer 15, and the first electrode 5 is connected here. be able to.
- a p-type silicon substrate 1 having a principal plane defined by the (111) plane in the crystal orientation indicated by the Miller index is prepared.
- the well-known hydrogen termination is performed on the silicon substrate 1 with an HF-based etching solution.
- the substrate 1 is charged into a well-known OMVPE (Organic Metallic Vapor Phase Epitaxy), that is, a reaction chamber of a metal organic chemical vapor deposition apparatus, and the temperature is raised to, for example, 170.
- OMVPE Organic Metallic Vapor Phase Epitaxy
- thermal cleaning is performed at 110 ° C for 10 minutes to remove the oxide film on the surface of the substrate 1, and then the temperature is lowered to 110 ° C, for example, to stabilize.
- an aluminum nitride layer (A 1 N layer) is formed to a thickness of, for example, 3 nm as the first buffer layer 11 of the buffer region 3 by the OMVPE method.
- TMA trimethylaluminum gas
- NH 3 ammonia gas
- TMI trimethylindium gas
- TMG trimethylgallium gas
- a second buffer layer 12 of I no.sG a 0.5N is formed.
- Silane gas is used to introduce silicon as an n-type impurity.
- G a and In of the second buffer layer 12 are diffusible substances, a first buffer layer 11 made of A 1 N is provided, and the first buffer layer 11 Have a diffusion delay function of G a and I n, G a and I n pass through the first buffer layer 11 to the silicon substrate 1 during formation of the second buffer layer 12. Difficult to spread. Therefore, the crystallinity does not deteriorate during the epitaxial growth of the second buffer layer 12.
- n-type nitride semiconductor layer 13 composed of n-type GaN in the main semiconductor region 4
- supply of TMG, TMI, and SiH to the reaction chamber of the OMV PE apparatus was stopped.
- the temperature of the substrate 1 was raised to 110 ° C.
- the TMG 4. 3 umo 1 / in, silane (S i H 4) 1.
- S nmol Zm in, the ammonia proportion of 5 3. 6 mm ol / min into the reaction chamber .
- an n-type nitride semiconductor layer 13 made of n-type GaN having a thickness of 2 nm is obtained.
- the n-type non-net concentration of the nitride semiconductor layer 1 3 is 3 X 1 0 1 8 c m_ 3 For example, lower than the impurity concentration of the substrate 1.
- the n-type nitride semiconductor layer 13 of the main semiconductor region 4 is It has good crystallinity inheriting the crystallinity of the second layer 12.
- G a and I n of the second buffer layer 12 are slightly reduced in the first buffer layer 11 made of A 1 N in the latter half of the formation of the n-type nitride semiconductor layer 13. 4007849
- the alloy layer 2 shown in FIG. 1 has not yet been formed.
- Ga and In can be diffused into the substrate 1 during formation of the n-type nitride semiconductor layer 13.
- an active layer 14 having a known multiple quantum well structure is formed on the n-type nitride semiconductor layer 13 functioning as an n-type cladding layer.
- the active layer 14 having a multiple quantum well structure is shown as a single layer for simplicity of illustration, but it is actually composed of a plurality of barrier layers and a plurality of well layers. For example, four layers are alternately arranged.
- the active layer 14 having a multiple quantum well structure is obtained by repeating the formation of the barrier layer and the well layer, for example, four times.
- the active layer 14 inherits the crystallinity of the underlying n-type nitride semiconductor layer 13 and has good crystallinity.
- the active layer 14 can be doped with, for example, a p-type impurity.
- Ga and In of the second buffer layer 12 diffuse into the substrate 1 through the first buffer layer 11 from the middle of the formation period of the active layer 14, and the first buffer layer 1 A1 of 1 also diffuses into the substrate 1.
- an alloy layer 2 of Si, Ga, In, and A1 shown in FIG. The formation period of the alloy layer 2 can be adjusted by the thickness of the first buffer layer 11. All of Ga, In, and A 1 diffused into the substrate 1 do not become the alloy layer 2, and a p-type impurity diffusion region 16 including all or part of Ga, In, and Al is formed deeper than the alloy layer 2.
- the substrate 1 is p-type, the conductivity type does not reverse.
- a p-type nitride semiconductor layer 15 made of p-type GaN having a thickness of about 500 nm is formed on the active layer 14.
- Magnesium (Mg) is introduced at a concentration of, for example, 3X10i 8 cm- 3 , and functions as a p-type impurity.
- the first and second electrodes 5 are formed by a well-known vacuum evaporation method to complete the light emitting diode.
- a characteristic line A in FIG. 2 indicates a current flowing through the light emitting diode when the first electrode 5 applies a ⁇ and the second electrode 6 applies a negative forward voltage to the light emitting diode according to the first embodiment. Is shown.
- the characteristic line B in FIG. 2 shows the current of the light-emitting diode when a forward voltage is applied to the conventional light-emitting diode in which the substrate 1 is an n-type silicon substrate as in Patent Document 1 described above.
- the drive voltage required to pass a current of 20 mA to the light-emitting diode is 3.36 V for the characteristic line A and 3.98 V for the characteristic line B. Therefore, the drive voltage for flowing a current of 20 mA can be reduced by 0.62 V by a very simple method of changing the conductivity type of the substrate 1 from the conventional n-type to the p-type.
- Figure 3 is an energy band diagram for explaining the reason why the forward drive voltage of the light emitting diode can be reduced.
- Ec indicates the conduction band
- Ev indicates the valence band
- ⁇ f indicates the Fermi level.
- FIG. 3A shows an energy band state when an n-type GaN layer is directly epitaxially grown on an n-type Si substrate (n-Si).
- n-Si n-type Si substrate
- FIG. 3B shows an energy band state between the substrate and the InGaN layer when the first buffer layer 11 made of AlN in FIG. 1 in Patent Document 1 is made negligibly thin. It is shown.
- Fig. 3 (B) an alloy layer is formed on the surface of the n-type silicon substrate (n-Si), which suppresses the potential barrier of height ⁇ ⁇ shown in Fig. 3 (A). ing. Only 4007849
- Ga diffusion region is a p-type semi-conductor region, pn junction in silicon substrate (n-S i) occurs, has occurred potential barrier height BH 2 is.
- FIG. 3 (C) shows an energy band state when a p-type silicon substrate (p-Si) is used according to the present embodiment, similarly to FIG. 3 (B).
- p-Si p-type silicon substrate
- a pn junction is not formed even if the p-type impurities Ga, In, and A1 diffuse into the p-type silicon substrate 1.
- n-GalnN layer! Single S i the potential barrier there height BH 3 Ru between the layers, the height BH 3 of this potential barrier to and interposed alloy layer lower than the height BH 2 shown in FIG. 3 (B) Therefore, the voltage drop here is extremely small.
- the crystallinity of the main semiconductor region 4 can be kept good, and the driving voltage of the light emitting diode can be easily greatly reduced. That is, the p-type silicon substrate 1 is used in spite of having the n-type buffer region 3. For this reason, even if the elements belonging to Group 3 such as Al, Ga, and In contained in the buffer region 3 diffuse into the p-type silicon substrate 1, these elements are p-type impurities with respect to silicon. Therefore, no pn junction occurs in the p-type silicon substrate 1. Therefore, what corresponds to the voltage drop due to the pn junction in the silicon substrate generated in Patent Document 1 does not occur in the p-type silicon substrate 1 according to the present invention.
- the alloy layer 2 has a function of generating electrons and holes at the interface with the p-type silicon substrate 1 and recombining the electrons and holes, the p-type silicon substrate 1 and the n-type buffer The potential barrier at the heterojunction with region 3 is reduced. Therefore, according to this embodiment, a drastic reduction in the driving voltage of the light emitting diode can be easily achieved.
- Example 2 Since the buffer region 3 is provided, the main semiconductor region 4 having good crystallinity can be obtained.
- Example 2
- FIG. 4 a light emitting diode according to a second embodiment shown in FIG. 4 will be described.
- Fig. 4 In FIGS. 5 to 9 to be described later, substantially the same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.
- the light emitting diode shown in FIG. 4 has the same structure as FIG. 1 except that a buffer region 20 having a multilayer structure is added to the buffer region 3 shown in FIG.
- the modified buffer region 3a in FIG. 4 is configured by arranging a multilayer buffer region 20 on the first and second buffer layers 11 and 12 formed in the same manner as in FIG. ing.
- the multi-layer buffer area 2.0 in FIG. 4 is composed of a plurality of first layers 21 and a plurality of second layers 22 which are repeatedly and alternately arranged.
- the plurality of first layers 21 are made of a nitride semiconductor containing A1 (aluminum) in a first ratio.
- the plurality of second layers 22 are made of a nitride semiconductor that does not contain A 1 or contains a second proportion smaller than the first proportion.
- the first layer 21 is, for example,
- M is at least one element selected from In (indium) and B (boron),
- the X and y are 0 ⁇ X ⁇ 1,
- the first layer 21 is made of A 1 N, and does not contain a conductivity type determining impurity.
- the first layer 21 can be doped with an n-type impurity such as silicon (Si).
- the second layer 22 is, for example,
- M is at least one element selected from In (indium) and B (boron), 4007849
- a and b are 0 ⁇ a ⁇ 1
- the second layer 22 is desirably formed of the same nitride semiconductor as the second buffer layer 12, and is made of n-type GaN in this embodiment.
- the thickness of the second layer 22 is preferably set to 10 ⁇ m or more, which is a thickness that does not generate a quantum mechanical energy level.
- TMG was flowed at a rate of 50 / zmolZmin to separate the second layer 22 of GaN having a thickness of 25 nm into an epitaxy.
- Growing kishal. The steps of forming the first and second layers 21 and 22 are repeated 20 times to obtain a buffer region 20 having a multilayer structure.
- FIG. 4 for simplicity of illustration, only the first and second layers 21 and 22 are each shown in only four layers.
- the first and second layers 21 and 22 are formed identically with the first and second buffer layers 11 and 12, and the first and second buffer layers 11 and 12 are formed. It can be considered as a part of the buffer region 20 having a multilayer structure.
- the light emitting diode of Example 3 shown in FIG. 5 is different from the light emitting diode of FIG. 1 in that the n-type nitride semiconductor layer 13 is omitted and the p-type nitride of p-type GaN shown in FIG.
- the second layer 12 of the buffer region 3 has the same function as the n-type nitride semiconductor region 13 of FIG. 1 for a double heterostructure. The same effect as the light emitting diode of FIG. 1 can be obtained by the light emitting diode shown in FIG. Example 4
- the light emitting diode of Example 4 shown in FIG. 6 has a deformed first electrode 5a, and is otherwise the same as FIG.
- the first electrode 5a in FIG. 6 includes a light-transmitting conductive film 51 formed on almost the entire surface of the main semiconductor region 4, that is, the surface of the p-type nitride semiconductor layer 15, and this conductive film. And a connection metal layer 52, which can also be called a bonding pad electrode, formed substantially at the center on the surface of 51.
- Optical transparent conductive film 5 1, a mixture of oxide Injumu (I n 2 0 3) and tin oxide (S n O 2), or oxidation Injumu (I n 2 O 3), or tin oxide (S n 0 2 ) And has a function of transmitting light generated in the active layer 14.
- the light-transmitting conductive film 51 has a thickness of about 10 nm and is in ohmic contact with the p-type nitride semiconductor layer 15.
- connection metal layer 52 is made of a metal such as Ni (nickel), Au (gold), and A1 (aluminum), and is formed to a thickness that allows bonding of wires (not shown). .
- the connection metal layer 52 is desirably made of a material that can form a Schottky barrier with the p-type nitride semiconductor layer 15. Since the connecting metal layer 52 is thicker than the conductive film 51, the light generated in the main semiconductor region 4 is not substantially transmitted.
- the metal of the connecting metal layer 52 is formed on the surface of the conductive film 51 or the conductive film 51 and the surface of the main semiconductor region 4 at the time of forming the connecting metal layer 52 or in a subsequent step. Partially diffuses and creates a short-circuit between the connection metal layer 52 and the main semiconductor region 4. A key barrier is formed.
- the conductive film 51 and the main semiconductor Current flows into region 4. Since the connection metal layer 52 is in short-circuit contact with the main semiconductor region 4, the current is suppressed by the Schottky barrier, and the short-circuit between the connection metal layer 52 and the main semiconductor region 4 is suppressed. Current hardly flows through one barrier. Therefore, the current component flowing from the conductive film 51 to the outer peripheral portion of the main semiconductor region 4 occupies most of the current between the first and second electrodes 5 a and 6. Light generated based on the current flowing through the outer peripheral portion of the main semiconductor region 4 is extracted above the light-transmitting conductive film 51 without being hindered by the light-impermeable connection metal layer 52.
- the Schottky barrier degrades with increasing temperature, and the leakage current through the Schottky barrier increases. Since the light emitting diode of the fourth embodiment in FIG. 6 is configured using the p-type silicon substrate 1 like the light emitting diode of the first embodiment in FIG. 1, the light emitting diode in the forward direction is similar to the first embodiment.
- the driving voltage is relatively small, and the power loss and heat generation are smaller than those using a conventional n-type silicon substrate. Therefore, the deterioration of the Schottky barrier between the connection metal layer 52 and the main semiconductor region 4 due to the heat generated in the silicon substrate 1 and the main semiconductor region 4 is suppressed, and the electric current passing through the Schottky barrier is suppressed. Flow is reduced.
- the outer peripheral portion of the main semiconductor region 4 for the entire current is The ratio of the flowing current increases, and the luminous efficiency is higher than that of the luminescence diode using the conventional n-type silicon substrate. If the heat generated by the main semiconductor region 4 and the silicon substrate 1 in FIG. 4 can flow to the outer peripheral side, and the luminous efficiency increases.
- the modified configuration of the first electrode 5a in FIG. 6 can be applied to the light emitting diodes of the second and third embodiments shown in FIGS. Example 5
- the light-emitting diode of Example 5 shown in FIG. 7 is located between the first electrode 5a and the main semiconductor region 4 of the light-emitting diode of Example 4 in FIG.
- An ⁇ -type trapping nitride semiconductor layer 53 composed of an ⁇ -type nitride semiconductor doped with ⁇ -type impurities is added to the nitride semiconductor represented by, and the other configuration is the same as that of FIG.
- the ⁇ -type trapping nitride semiconductor layer 53 is preferably made of ⁇ -type GaN.
- One main surface of the n-type auxiliary nitride semiconductor layer 53 added in FIG. 7 is in contact with the p-type nitride semiconductor layer 15 and the other main surface is in contact with the light-transmitting conductive film 51.
- the resistance value of ohmic contact between the conductive film 51 and the n-type auxiliary nitride semiconductor layer 53 is because each of the light-transmitting conductive films 51 has the same characteristics as the 11-type semiconductor. Is extremely low, the power loss here is small, the forward drive voltage is further reduced, and the luminous efficiency is improved.
- the thickness of the n-type auxiliary nitride semiconductor layer 53 is reduced. It is desirable that the thickness be 1 to 30 nm, more preferably 5 to 10 nm. Further, the thickness of the n-type auxiliary nitride semiconductor layer 53 is desirably a thickness at which a quantum mechanical tunnel effect can be obtained.
- the p-type nitride semiconductor layer 15 When a forward voltage is applied between the first and second electrodes 5a and 6 in FIG. 7, the p-type nitride semiconductor layer 15 from the conductive film 51 through the n-type trapping nitride semiconductor layer 53 The current flows into.
- the n-type auxiliary nitride semiconductor layer 53 By forming the n-type auxiliary nitride semiconductor layer 53, the amount of reduction in the barrier of ohmic contact between the n-type auxiliary nitride semiconductor layer 53 and the conductive film 51 is reduced by the n-type auxiliary nitride semiconductor layer 53 and the p-type auxiliary nitride semiconductor.
- the height of the barrier is larger than that of the layer 15, the forward drive voltage can be reduced by these differences, and the luminous efficiency is improved.
- the structure of the first electrode 5a in FIG. 7 and the n-type auxiliary nitride semiconductor layer 53 can be applied to the embodiments 2 and 3 in
- the transistor of Example 6 shown in FIG. 8 has the same configuration as that of FIG. 1 except that the main semiconductor region 4 for the light emitting diode of FIG. 1 is replaced by the main semiconductor region 4b for the transistor. is there.
- the n-type nitride semiconductor region 13 composed of the n-type GaN of the main semiconductor region 4b and the lower structure are the same as those in FIG.
- the main semiconductor region 4b includes an n-type nitride semiconductor region 13 functioning as a collector region, and a base region 31 made of a p-type nitride semiconductor epitaxially grown thereon.
- an emitter region 32 epitaxially grown and made of an n-type nitride semiconductor.
- a base electrode 33 is connected to the base region 31, and an emitter electrode 34 as a first electrode is connected to the emitter region 32.
- the second electrode 6 on the lower surface of the p-type silicon substrate 1 functions as a collector electrode.
- the transistor in FIG. 8 is an npn transistor, when the transistor is turned on, the collector electrode 6 is set to the highest potential, and a current flows from the collector electrode 6 side to the emitter electrode 34 side. Also in this transistor, the voltage drop at the time of ON between the two electrodes 6 and 34 can be reduced as in FIG. Example 7
- the main semiconductor region 4 for the light emitting diode in FIG. 1 is replaced with a main semiconductor region 4c for the field effect transistor. They have the same configuration.
- the n-type nitride semiconductor region 13 made of the same n-type GaN as that of FIG. 1 is provided in the main semiconductor region 4c of FIG. In FIG. 9, the n-type nitride semiconductor region 13 functions as a drain region.
- a body region 41 made of a p-type nitride semiconductor is provided in the region 13 by introducing a p-type impurity, and an n-type impurity is introduced into the body region 41 by introducing an n-type impurity.
- a source region 42 made of a nitride semiconductor is provided.
- a good electrode 44 is disposed on the surface of the body region 41 between the source region 42 and the n-type nitride semiconductor region 13 as a drain region via an insulating film 43.
- a source electrode 45 as a first electrode is connected to the source region 42.
- the second electrode 6 on the lower surface of the p-type silicon substrate 1 functions as a drain electrode.
- the buffer region 3 in FIG. 8 can also be used as a collector region, and the buffer region 3 in FIG. 9 can also be used as a drain region.
- the second buffer layer 12 of the buffer areas 3 and 3a contains In, it can be a layer that does not contain In.
- the alloy layer 2 is formed using the heating in the epitaxial growth process of the buffer regions 3, 3a and the main semiconductor regions 4, 4, a, 4b, 4c. The alloy layer 2 can be formed in an independent step.
- the present invention can be applied to a rectifier diode having a pn junction or a Schottky diode having a Schottky barrier electrode. Further, the present invention can be applied to all semiconductor devices in which current flows in the thickness direction of the substrate 1.
- the present invention can be used for a semiconductor device such as a light emitting diode, a transistor, a field effect transistor, and a rectifier diode.
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JP4697397B2 (ja) * | 2005-02-16 | 2011-06-08 | サンケン電気株式会社 | 複合半導体装置 |
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JP2008091470A (ja) * | 2006-09-29 | 2008-04-17 | Showa Denko Kk | Iii族窒化物化合物半導体積層構造体の成膜方法 |
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JP2011501399A (ja) * | 2007-10-12 | 2011-01-06 | ラティス パワー (チアンシ) コーポレイション | シランを前駆物質として用いるn型半導体材料を製作する方法 |
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KR101376221B1 (ko) | 2011-12-08 | 2014-03-21 | 경북대학교 산학협력단 | 질화물 반도체 소자 및 그 소자의 제조 방법 |
JP2014086698A (ja) * | 2012-10-26 | 2014-05-12 | Furukawa Electric Co Ltd:The | 窒化物半導体装置の製造方法 |
Also Published As
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TWI240969B (en) | 2005-10-01 |
JPWO2004109782A1 (ja) | 2006-07-20 |
US7400000B2 (en) | 2008-07-15 |
TW200507112A (en) | 2005-02-16 |
JP3952210B2 (ja) | 2007-08-01 |
US20060094145A1 (en) | 2006-05-04 |
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