WO2011161791A1 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- WO2011161791A1 WO2011161791A1 PCT/JP2010/060728 JP2010060728W WO2011161791A1 WO 2011161791 A1 WO2011161791 A1 WO 2011161791A1 JP 2010060728 W JP2010060728 W JP 2010060728W WO 2011161791 A1 WO2011161791 A1 WO 2011161791A1
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- electron transit
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 56
- 239000000758 substrate Substances 0.000 claims abstract description 35
- 229910002704 AlGaN Inorganic materials 0.000 claims description 10
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 150000004767 nitrides Chemical class 0.000 claims description 2
- 229910052763 palladium Inorganic materials 0.000 claims description 2
- 229910052697 platinum Inorganic materials 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 164
- 238000000034 method Methods 0.000 description 18
- 238000004519 manufacturing process Methods 0.000 description 14
- 230000004888 barrier function Effects 0.000 description 13
- 239000011241 protective layer Substances 0.000 description 12
- 238000002488 metal-organic chemical vapour deposition Methods 0.000 description 6
- 238000005530 etching Methods 0.000 description 5
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 229910052581 Si3N4 Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 4
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- XCZXGTMEAKBVPV-UHFFFAOYSA-N trimethylgallium Chemical compound C[Ga](C)C XCZXGTMEAKBVPV-UHFFFAOYSA-N 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 238000001784 detoxification Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 125000000962 organic group Chemical group 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- -1 thickness Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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- 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
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/778—Field effect transistors with two-dimensional charge carrier gas channel, e.g. HEMT ; with two-dimensional charge-carrier layer formed at a heterojunction interface
- H01L29/7786—Field effect transistors with two-dimensional charge carrier gas channel, e.g. HEMT ; with two-dimensional charge-carrier layer formed at a heterojunction interface with direct single heterostructure, i.e. with wide bandgap layer formed on top of active layer, e.g. direct single heterostructure MIS-like HEMT
- H01L29/7787—Field effect transistors with two-dimensional charge carrier gas channel, e.g. HEMT ; with two-dimensional charge-carrier layer formed at a heterojunction interface with direct single heterostructure, i.e. with wide bandgap layer formed on top of active layer, e.g. direct single heterostructure MIS-like HEMT with wide bandgap charge-carrier supplying layer, e.g. direct single heterostructure MODFET
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- H01L27/0617—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body including a plurality of individual components in a non-repetitive configuration integrated circuits having a two-dimensional layout of components without a common active region comprising components of the field-effect type
- H01L27/0629—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body including a plurality of individual components in a non-repetitive configuration integrated circuits having a two-dimensional layout of components without a common active region comprising components of the field-effect type in combination with diodes, or resistors, or capacitors
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- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
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- H01L29/417—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions carrying the current to be rectified, amplified or switched
- H01L29/41725—Source or drain electrodes for field effect devices
- H01L29/41758—Source or drain electrodes for field effect devices for lateral devices with structured layout for source or drain region, i.e. the source or drain region having cellular, interdigitated or ring structure or being curved or angular
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- H01L29/66409—Unipolar field-effect transistors
- H01L29/66446—Unipolar field-effect transistors with an active layer made of a group 13/15 material, e.g. group 13/15 velocity modulation transistor [VMT], group 13/15 negative resistance FET [NERFET]
- H01L29/66462—Unipolar field-effect transistors with an active layer made of a group 13/15 material, e.g. group 13/15 velocity modulation transistor [VMT], group 13/15 negative resistance FET [NERFET] with a heterojunction interface channel or gate, e.g. HFET, HIGFET, SISFET, HJFET, HEMT
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- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/778—Field effect transistors with two-dimensional charge carrier gas channel, e.g. HEMT ; with two-dimensional charge-carrier layer formed at a heterojunction interface
- H01L29/7786—Field effect transistors with two-dimensional charge carrier gas channel, e.g. HEMT ; with two-dimensional charge-carrier layer formed at a heterojunction interface with direct single heterostructure, i.e. with wide bandgap layer formed on top of active layer, e.g. direct single heterostructure MIS-like HEMT
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/86—Types of semiconductor device ; Multistep manufacturing processes therefor controllable only by variation of the electric current supplied, or only the electric potential applied, to one or more of the electrodes carrying the current to be rectified, amplified, oscillated or switched
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- H01L27/0203—Particular design considerations for integrated circuits
- H01L27/0207—Geometrical layout of the components, e.g. computer aided design; custom LSI, semi-custom LSI, standard cell technique
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Definitions
- the present invention relates to a semiconductor device.
- HEMT high electron mobility transistor
- AlGaN layer and a GaN layer are formed by crystal growth above a substrate, and the GaN layer functions as an electron transit layer.
- the band gap of GaN is 3.4 eV, which is larger than the band gap of Si (1.1 eV) and the band gap of GaAs (1.4 eV).
- the GaN-based HEMT has a high withstand voltage and is promising as a high withstand voltage power device for automobiles and the like.
- a body diode inevitably exists in a Si-based field effect transistor.
- the body diode is connected to the transistor so as to be in antiparallel, and functions as a freewheeling diode in a full bridge circuit system used for a high power supply.
- a body diode does not necessarily exist in a GaN-based HEMT. Therefore, a structure in which a pn junction diode in which a p-type layer and an n-type layer are stacked in the thickness direction of the substrate is connected to a GaN-based HEMT has been proposed.
- the operation of the diode is likely to be delayed. And with a delay, before a diode operate
- An object of the present invention is to provide a semiconductor device that can appropriately operate a diode connected to a transistor.
- a substrate a transistor including a first electron transit layer and an electron supply layer stacked in the thickness direction of the substrate, and the first electron transit layer above the substrate And a second electron transit layer formed in parallel with the electron supply layer, an anode electrode that is Schottky joined to the second electron transit layer, a cathode electrode that is ohmic joined to the second electron transit layer, Is provided.
- the anode electrode is connected to the source of the transistor, and the cathode electrode is connected to the drain of the transistor.
- FIG. 1A is a cross-sectional view showing the structure of the semiconductor device according to the first embodiment.
- FIG. 1B is a plan view showing the positional relationship of the electrodes in the first embodiment.
- FIG. 2 is a schematic diagram showing the positional relationship of the electrodes in three dimensions.
- FIG. 3A is a cross-sectional view illustrating the method for manufacturing the semiconductor device according to the first embodiment.
- FIG. 3B is a cross-sectional view illustrating a method for manufacturing the semiconductor device following FIG. 3A.
- FIG. 3C is a cross-sectional view illustrating a method for manufacturing the semiconductor device following FIG. 3B.
- FIG. 3D is a cross-sectional view illustrating a method for manufacturing the semiconductor device following FIG. 3C.
- FIG. 3E is a cross-sectional view showing a method for manufacturing the semiconductor device following FIG. 3D.
- FIG. 4 is a diagram showing the configuration of the MOCVD apparatus.
- FIG. 5A is a cross-sectional view showing the structure of the semiconductor device according to the second embodiment.
- FIG. 5B is a plan view showing the positional relationship of the electrodes in the second embodiment.
- FIG. 6A is a cross-sectional view illustrating the method for manufacturing the semiconductor device according to the second embodiment.
- 6B is a cross-sectional view illustrating a method for manufacturing the semiconductor device, following FIG. 6A.
- 6C is a cross-sectional view illustrating a method for manufacturing the semiconductor device, following FIG. 6B.
- FIG. 6A is a cross-sectional view showing the structure of the semiconductor device according to the second embodiment.
- FIG. 5B is a plan view showing the positional relationship of the electrodes in the second embodiment.
- FIG. 6A is a cross-sectional view illustrating the
- FIG. 6D is a cross-sectional view showing a method for manufacturing the semiconductor device, following FIG. 6C.
- FIG. 6E is a cross-sectional view illustrating a method for manufacturing the semiconductor device, following FIG. 6D.
- FIG. 7A is a cross-sectional view showing a modification of the first embodiment.
- FIG. 7B is a cross-sectional view showing a modification of the second embodiment.
- FIG. 1A is a cross-sectional view showing the structure of the semiconductor device according to the first embodiment
- FIG. 1B is a plan view showing the positional relationship of the electrodes in the first embodiment
- FIG. 2 is a schematic diagram showing the positional relationship of the electrodes in three dimensions.
- FIG. 1A shows a cross section taken along line II in FIG. 1B.
- a buffer layer 2 an electron transit layer 3 (second electron transit layer), an insulating layer 4, an electron transit layer 5 (first electron transit) are formed on a substrate 1.
- Layer the electron supply layer 6, the cap layer 7, and the insulating layer 8 are formed in this order.
- the substrate 1 is, for example, an n-type Si substrate.
- the electron transit layer 3 for example, a GaN layer is formed, and the thickness thereof is, for example, 10 nm to 5000 nm.
- the insulating layer 4 for example, an AlN layer is formed, and the thickness thereof is, for example, 10 nm to 5000 nm.
- the electron transit layer 5 for example, a GaN layer is formed, and the thickness thereof is, for example, 10 nm to 5000 nm.
- the electron supply layer 6 for example, an Al 0.25 Ga 0.75 N layer is formed, and the thickness thereof is, for example, 1 nm to 100 nm.
- the cap layer 7, for example, an n-type GaN layer is formed, and the thickness thereof is, for example, 1 nm to 100 nm.
- the cap layer 7 is doped with Si, for example.
- the insulating layer 8 for example, a silicon nitride layer is formed.
- An opening 10 g for the gate electrode is formed in the insulating layer 8, and an opening 10 s for the source electrode and an opening 10 d for the drain electrode are formed in the insulating layer 8 and the cap layer 7.
- an opening 9 a for the anode electrode and an opening 9 k for the cathode electrode are formed in the electron supply layer 6, the electron transit layer 5, and the insulating layer 4.
- the opening 9a is connected to the opening 10s, and the opening 9k is connected to the opening 10d.
- an insulating layer 11 that covers the electron supply layer 6, the electron transit layer 5, and the insulating layer 4 is formed on the side surfaces of the opening 9a and the opening 9k.
- the opening 10g is located closer to the opening 10s than the opening 10d.
- An anode electrode 12a that is in Schottky contact with the electron transit layer 3 is formed at the bottom of the opening 9a.
- the anode electrode 12a for example, a stacked body of a Ni film in contact with the electron transit layer 3 and an Au film positioned thereon is formed.
- a source electrode 13s located on the anode electrode 12a and in ohmic contact with the electron supply layer 6 is formed in the opening 9a and the opening 10s.
- the source electrode 13s for example, a stacked body of a Ta film in contact with the anode electrode 12a and the electron supply layer 6 and an Al film located thereon is formed.
- a cathode / drain electrode 13d that is in ohmic contact with the electron transit layer 3 and the electron supply layer 6 is formed in the opening 9k and the opening 10d.
- a cathode / drain electrode 13d for example, a stacked body of a Ta film in contact with the electron transit layer 3 and the electron supply layer 6 and an Al film positioned thereon is formed.
- a gate electrode 13g is formed in the opening 10g.
- the gate electrode 13g for example, a stacked body of a Ni film in contact with the cap layer 7 and an Au film located thereon is formed.
- a surface protective layer 14 covering the gate electrode 13g, the source electrode 13s, and the cathode / drain electrode 13d is formed on the insulating layer 8.
- the surface protective layer 14 for example, a silicon nitride layer is formed.
- the gate electrode 13g, the source electrode 13s, and the cathode / drain electrode 13d are arranged in a comb shape.
- the gate electrode 13g is connected to the gate pad 15g
- the source electrode 13s is connected to the source pad 15s
- the cathode / drain electrode 13d is connected to the drain pad 15d.
- the surface protective layer 14 is formed with openings that expose the gate pad 15g, the source pad 15s, and the drain pad 15d, respectively.
- GaN-based HEMT including the gate electrode 13g, the source electrode 13s, the cathode / drain electrode 13d, the electron supply layer 6, and the electron transit layer 5.
- a Schottky barrier diode including the anode electrode 12a, the cathode / drain electrode 13d, and the electron transit layer 3 and connected in antiparallel to the HEMT.
- the Schottky barrier diode functions as a free wheel diode.
- the cathode electrode of the Schottky barrier diode is integrated with the drain electrode of the HEMT, and the anode electrode is in direct contact with the source electrode. Therefore, the Schottky barrier diode operates before a large current flows through the HEMT, and an increase in power consumption can be suppressed.
- a large positive voltage is applied to the cathode / drain electrode 13d, electrons move from the anode electrode 12a to the cathode / drain electrode 13d via the electron transit layer 3, and the cathode / drain electrode 13d to the anode electrode 12a. Current flows toward That is, the Schottky barrier diode functions as a protection diode. Therefore, it is possible to prevent HEMT failure.
- 3A to 3E are cross-sectional views showing a method of manufacturing the semiconductor device according to the first embodiment in the order of steps.
- a buffer layer 2, an electron transit layer 3, an insulating layer 4, an electron transit layer 5, an electron supply layer 6, and a cap layer 7 are disposed on the substrate 1 in this order, for example, organic chemical vapor. It is formed by phase deposition (MOCVD: metal-organic-chemical-vapor-deposition) method.
- MOCVD metal-organic-chemical-vapor-deposition
- FIG. 4 is a diagram showing the configuration of the MOCVD apparatus.
- a high frequency coil 41 is disposed around the quartz reaction tube 40, and a carbon susceptor 42 for placing the substrate 101 is disposed inside the reaction tube 40.
- Two gas introduction pipes 44 and 45 are connected to the upstream end of the reaction tube 40 (the left end portion in FIG. 4), and the source gas of the compound is supplied.
- NH 3 gas is introduced from the gas introduction pipe 44 as the N source gas
- organic group III compound raw materials such as trimethylaluminum (TMA) and trimethylgallium (TMA) are introduced from the gas introduction pipe 45 as the source gas of the group III element. Is done.
- TMA trimethylaluminum
- TMA trimethylgallium
- Crystal growth is performed on the substrate 101, and excess gas is discharged from the gas discharge pipe 46 to the detoxification tower.
- the gas discharge pipe 46 is connected to a vacuum pump, and the discharge port of the vacuum pump is connected to a detoxification tower.
- Conditions for forming an Al 0.25 Ga 0.75 N layer as the electron supply layer 6 are set as follows, for example. Trimethylgallium (TMG) flow rate: 0-50 sccm, Trimethylaluminum (TMA) flow rate: 0-50 sccm, Ammonia (NH3) flow rate: 20 slm, Pressure: 100 Torr, Temperature: 1100 ° C.
- TMG Trimethylgallium
- TMA Trimethylaluminum
- NH3 Ammonia
- an insulating layer 8 is formed on the cap layer 7.
- the insulating layer 8 can be formed by, for example, a plasma CVD method.
- an opening 10 g, a source electrode opening, and a drain electrode opening are formed in the insulating layer 8.
- selective etching using SF 6 gas is performed using a resist pattern as a mask.
- openings 10 s and 10 d are formed in the cap layer 7.
- selective etching using Cl 2 gas is performed using a resist pattern as a mask.
- the openings 9a and 9k are formed. Also in the formation of the openings 9a and 9k, for example, selective etching using Cl 2 gas is performed using a resist pattern as a mask.
- the insulating layer 11 is formed on the side surfaces of the openings 9a and 9k, the gate electrode 13g is formed in the opening 10g, and the anode electrode 12a is formed on the bottom of the opening 9a.
- the insulating layer 11 is formed before the anode electrode 12a.
- One of the gate electrode 13g and the anode electrode 12a may be formed first, or both may be formed simultaneously.
- the gate electrode 13g and the anode electrode 12a can be formed by, for example, a lift-off method.
- a source electrode 13s is formed in the openings 9a and 10s, and a cathode / drain electrode 13d is formed in the openings 9k and 10d.
- One of the source electrode 13s and the cathode / drain electrode 13d may be formed first, or both may be formed simultaneously.
- the source electrode 13s and the cathode / drain electrode 13d can be formed by, for example, a lift-off method.
- a surface protective layer 14 covering the gate electrode 13g, the source electrode 13s, and the cathode / drain electrode 13d is formed on the insulating layer 8.
- the surface protective layer 14 can be formed by, for example, a plasma CVD method.
- the back surface of the substrate is polished so that the substrate has a predetermined thickness. Further, an opening for exposing the gate pad, an opening for exposing the source pad, and an opening for exposing the drain pad are formed in the surface protective layer 14.
- the semiconductor device according to the first embodiment can be completed.
- FIG. 5A is a cross-sectional view showing the structure of the semiconductor device according to the second embodiment
- FIG. 5B is a plan view showing the positional relationship of the electrodes in the second embodiment.
- FIG. 5A shows a cross section taken along the line II in FIG. 5B.
- a buffer layer 22, an electron transit layer 23 (first electron transit layer), an electron supply layer 24, a cap layer 25, an insulating layer 26, and an electron are formed on a substrate 21.
- a traveling layer 27 (second electron traveling layer) and an insulating layer 28 are formed in this order.
- the substrate 21 is, for example, an n-type Si substrate.
- an Al 0.25 Ga 0.75 N layer is formed, and the thickness thereof is, for example, 1 nm to 100 nm.
- the cap layer 25 for example, an n-type GaN layer is formed, and the thickness thereof is, for example, 1 nm to 100 nm.
- the cap layer 25 is doped with, for example, Si.
- the electron transit layer 27 for example, a GaN layer is formed, and the thickness thereof is, for example, 10 nm to 5000 nm.
- the insulating layer 28 for example, a silicon nitride layer is formed.
- an opening 30s for a source electrode, an opening 30d for a drain electrode, an opening 29a for an anode electrode, and an opening 29k for a cathode electrode are formed.
- the opening 30s and the opening 30d are also formed in the electron transit layer 27, the insulating layer 26, and the cap layer 25.
- the opening 30s and the opening 29a are connected to each other, and it is not necessary to clarify the boundary between them.
- the opening 30d and the opening 29k are connected to each other, and it is not necessary to clarify the boundary between them.
- a recess 10g for the gate electrode is formed in the cap layer 25. The recess 30g is located closer to the opening 30s than the opening 30d.
- a gate electrode 33g is formed in the recess 30g.
- the gate electrode 33g for example, a stacked body of a Ni film located at the bottom of the recess 30g and an Au film located thereon is formed. Openings connected to the opening 29a and the opening 30s are formed at positions where the electron transit layer 27 and the insulating layer 26 are aligned with the recess 10g in plan view, and an insulating layer covering the gate electrode 33g is formed in the opening. 31 is formed.
- the insulating layer 31 for example, an AlN layer is formed.
- An anode electrode 32 a that is in Schottky contact with the electron transit layer 27 is formed in the opening 29 a and on the insulating layer 31.
- anode electrode 32a for example, a stacked body of a Ni film in contact with the electron transit layer 27 and an Au film positioned thereon is formed. Further, a source electrode 33 s that is in contact with the anode electrode 32 a and is in ohmic contact with the electron supply layer 24 is formed in the opening 29 a and the opening 30 s. As the source electrode 33s, for example, a stacked body of a Ta film in contact with the anode electrode 32a and the electron supply layer 24 and an Al film positioned thereon is formed. Furthermore, a cathode / drain electrode 33d that is in ohmic contact with the electron transit layer 27 and the electron supply layer 24 is formed in the opening 29k and the opening 30d. As the cathode / drain electrode 33d, for example, a stacked body of a Ta film in contact with the electron transit layer 27 and the electron supply layer 24 and an Al film positioned thereon is formed.
- a surface protective layer 34 covering the source electrode 33s and the cathode / drain electrode 33d is formed on the insulating layer 2.
- the surface protective layer 34 for example, a silicon nitride layer is formed.
- the gate electrode 33g, the source electrode 33s, and the cathode / drain electrode 33d are arranged in a comb shape.
- the gate electrode 33g is connected to the gate pad
- the source electrode 33s is connected to the source pad
- the cathode / drain electrode 33d is connected to the drain pad.
- the surface protective layer 34 is formed with openings that expose the gate pad, source pad, and drain pad, respectively.
- GaN-based HEMT including the gate electrode 33g, the source electrode 33s, the cathode / drain electrode 33d, the electron supply layer 24, and the electron transit layer 23.
- a Schottky barrier diode that includes the anode electrode 32a, the cathode / drain electrode 33d, and the electron transit layer 27, and is connected in antiparallel to the HEMT.
- the Schottky barrier diode functions as a free wheel diode.
- the cathode electrode of the Schottky barrier diode is integrated with the drain electrode of the HEMT, and the anode electrode is in direct contact with the source electrode. Therefore, the Schottky barrier diode operates before a large current flows through the HEMT, and an increase in power consumption can be suppressed.
- a large positive voltage is applied to the cathode / drain electrode 33d, electrons move from the anode electrode 32a to the cathode / drain electrode 33d via the electron transit layer 27, and the cathode / drain electrode 33d to the anode electrode 32a. Current flows toward That is, the Schottky barrier diode functions as a protection diode. Therefore, it is possible to prevent HEMT failure.
- 6A to 6E are cross-sectional views illustrating a method of manufacturing the semiconductor device according to the second embodiment in the order of steps.
- a buffer layer 22, an electron transit layer 23, an electron supply layer 24, a cap layer 25, an insulating layer 26, and an electron transit layer 27 are formed on the substrate 21 in this order, for example, by MOCVD.
- the insulating layer 28 is formed on the electron transit layer 27.
- the insulating layer 28 can be formed by, for example, a plasma CVD method.
- openings 30 s, 30 d, 29 a, and 29 k are formed in the insulating layer 28.
- selective etching using SF 6 gas is performed using a resist pattern as a mask.
- the openings 30g, 30s, and 30d are formed.
- an opening connected to the opening 30 g is also formed in the electron transit layer 27 and the insulating layer 26.
- selective etching using Cl 2 gas is performed using a resist pattern as a mask.
- a gate electrode 33g is formed in the recess 30g.
- the insulating layer 31 is formed on the gate electrode 33g.
- an anode electrode 32 a is formed on the insulating layer 31.
- the gate electrode 33g and the anode electrode 32a can be formed by, for example, a lift-off method.
- the source electrode 33s is formed in the openings 29a and 30s, and the cathode / drain electrode 33d is formed in the openings 29k and 30d.
- One of the source electrode 33s and the cathode / drain electrode 33d may be formed first, or both may be formed simultaneously.
- the source electrode 33s and the cathode / drain electrode 33d can be formed by, for example, a lift-off method.
- a surface protective layer 34 covering the source electrode 33 s and the cathode / drain electrode 33 d is formed on the insulating layer 28.
- the surface protective layer 34 can be formed by, for example, a plasma CVD method.
- the back surface of the substrate is polished so that the substrate has a predetermined thickness. Further, an opening for exposing the gate pad, an opening for exposing the source pad, and an opening for exposing the drain pad are formed in the surface protective layer 34.
- the semiconductor device according to the second embodiment can be completed.
- the material, thickness, impurity concentration, etc. of the substrate and each layer are not particularly limited.
- a sapphire substrate, a SiC substrate, a GaN substrate, or the like may be used as the substrate in addition to the Si substrate.
- a layer containing a p-type or n-type semiconductor may be used, and at least two kinds of semiconductors having different lattice constants such as GaN or AlGaN are contained. A thing may be used.
- an insulating layer that insulates the electron transit layer included in the Schottky barrier diode and the HEMT at least AlN, AlGaN, p-type GaN, Fe-doped GaN, Si oxide, Al oxide, Si nitride, or C You may use what contains 1 type.
- examples of the material of the anode electrode that is in Schottky contact with the electron transit layer include Ni, Pd, and Pt, and these may be used in combination.
- an insulating layer 41 made of AlN or AlGaN and an n-type GaN layer 42 may be stacked on the cap layer 7 made of n-type GaN.
- the cap layer 25 made of n-type GaN is located below the gate electrode 33g, and the insulating layer 51 made of AlN or AlGaN and the n-type GaN layer are placed on such a cap layer 25. 52 may be laminated.
- These semiconductor devices can be used for switching semiconductor elements, for example. Moreover, such a switching element can be used for a switching power supply or an electronic device. Further, these semiconductor devices can be used as components for a full-bridge power supply circuit such as a server power supply circuit.
- the diode connected to the transistor can be appropriately operated.
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Abstract
Description
先ず、第1の実施形態について説明する。図1Aは、第1の実施形態に係る半導体装置の構造を示す断面図であり、図1Bは、第1の実施形態における電極の位置関係を示す平面図である。また、図2は、電極の位置関係を立体的に示す模式図である。なお、図1Aは、図1B中のI-I線に沿った断面を示している。
トリメチルガリウム(TMG)の流量:0~50sccm、
トリメチルアルミニウム(TMA)の流量:0~50sccm、
アンモニア(NH3)の流量:20slm、
圧力:100Torr、
温度:1100℃。
先ず、第2の実施形態について説明する。図5Aは、第2の実施形態に係る半導体装置の構造を示す断面図であり、図5Bは、第2の実施形態における電極の位置関係を示す平面図である。なお、図5Aは、図5B中のI-I線に沿った断面を示している。
Claims (19)
- 基板と、
前記基板の厚さ方向に積層された第1の電子走行層及び電子供給層を備えたトランジスタと、
前記基板の上方に、前記第1の電子走行層及び前記電子供給層と並行に形成された第2の電子走行層と、
前記第2の電子走行層にショットキー接合するアノード電極と、
前記第2の電子走行層にオーミック接合するカソード電極と、
を有し、
前記アノード電極が前記トランジスタのソースに接続され、
前記カソード電極が前記トランジスタのドレインに接続されていることを特徴とする半導体装置。 - 前記トランジスタは、前記電子供給層上に形成されたn型GaN層を有することを特徴とする請求項1に記載の半導体装置。
- 前記トランジスタは、
前記n型GaN層上に形成され、AlN又はAlGaNからなる絶縁層と、
前記絶縁層上に形成された第2のn型GaN層と、
を有することを特徴とする請求項2に記載の半導体装置。 - 前記トランジスタは、前記基板と前記第2の電子走行層との間に位置していることを特徴とする請求項1に記載の半導体装置。
- 前記第2の電子走行層は、前記基板と前記トランジスタとの間に位置していることを特徴とする請求項1に記載の半導体装置。
- 前記第2の電子走行層は、p型又はn型の半導体を含有することを特徴とする請求項1に記載の半導体装置。
- 前記第2の電子走行層は、互いに格子定数が相違する少なくとも2種類の半導体を含有することを特徴とする請求項1に記載の半導体装置。
- 前記第2の電子走行層は、GaN又はAlGaNを含有することを特徴とする請求項1に記載の半導体装置。
- 前記トランジスタと前記第2の電子走行層とを絶縁する絶縁層を有することを特徴とする請求項1に記載の半導体装置。
- 前記絶縁層は、AlN、AlGaN、p型GaN、FeドープGaN、Si酸化物、Al酸化物、Si窒化物、及びCからなる群から選択された少なくとも1種を含有することを特徴とする請求項5記載の半導体装置。
- 前記アノード電極は、Ni、Pd、及びPtからなる群から選択された少なくとも1種を含有することを特徴とする請求項1に記載の半導体装置。
- 基板と、
前記基板上に形成されたバッファ層と、
前記バッファ層上に形成された第2の電子走行層と、
前記第2の電子走行層上に形成された絶縁層と、
前記絶縁層上に形成された第1の電子走行層と、
前記第1の電子走行層上方に形成された電子供給層と、
前記電子供給層上に形成されたキャップ層と、
を有することを特徴とする半導体装置。 - 前記キャップ層、前記電子供給層、前記第1の電子走行層、及び前記絶縁層に、前記第2の電子走行層まで達するソース電極及びアノード電極用の開口部が形成され、
前記キャップ層、前記電子供給層、前記第1の電子走行層、及び前記絶縁層に前記第2の電子走行層まで達するドレイン電極及びカソード電極用の開口部が形成され、
前記ソース電極及び前記アノード電極用の開口部内に、前記第2の電子走行層にショットキー接合するアノード電極が形成され、
前記ドレイン電極及び前記カソード電極用の開口部内に、前記第2の電子走行層にオーミック接合するカソード電極が形成され、
前記アノード電極が前記電子供給層に接続され、
前記カソード電極が前記電子供給層に接続され、
前記アノード電極と前記カソード電極との間において、前記電子供給層上方にゲート電極が形成されていることを特徴とする請求項12に記載の半導体装置。 - 前記電子供給層上に形成されたn型GaN層を更に有することを特徴とする請求項12に記載の半導体装置。
- 前記n型GaN層上に形成され、AlN又はAlGaNからなる絶縁層と、
前記絶縁層上に形成された第2のn型GaN層と、
を更に有することを特徴とする請求項14に記載の半導体装置。 - 基板と、
前記基板上に形成されたバッファ層と、
前記バッファ層上に形成された第1の電子走行層と、
前記第1の電子走行層上方に形成された電子供給層と、
前記電子供給層上に形成されたキャップ層と、
前記キャップ層上に形成された絶縁層と、
前記絶縁層上に形成された第2の電子走行層と、
を有することを特徴とする半導体装置。 - 前記第2の電子走行層、前記絶縁層、前記キャップ層、及び前記電子供給層に、前記第1の電子走行層まで達するソース電極及びアノード電極用の開口部が形成され、
前記第2の電子走行層、前記絶縁層、前記キャップ層、及び前記電子供給層に、前記第1の電子走行層まで達するドレイン電極及びカソード電極用の開口部が形成され、
前記ソース電極及び前記アノード電極用の開口部内に、前記第2の電子走行層にショットキー接合するアノード電極が形成され、
前記ドレイン電極及び前記カソード電極用の開口部内に、前記第2の電子走行層にオーミック接合するカソード電極が形成され、
前記アノード電極が前記電子供給層に接続され、
前記カソード電極が前記電子供給層に接続され、
前記アノード電極と前記カソード電極との間において、前記電子供給層上方にゲート電極が形成されていることを特徴とする請求項16に記載の半導体装置。 - 前記電子供給層上に形成されたn型GaN層を更に有することを特徴とする請求項16に記載の半導体装置。
- 前記n型GaN層上に形成され、AlN又はAlGaNからなる絶縁層と、
前記絶縁層上に形成された第2のn型GaN層と、
を更に有することを特徴とする請求項18に記載の半導体装置。
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JP2007273795A (ja) * | 2006-03-31 | 2007-10-18 | Sanken Electric Co Ltd | 複合半導体装置 |
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CN103109369B (zh) | 2016-04-06 |
US20160005848A1 (en) | 2016-01-07 |
CN103109369A (zh) | 2013-05-15 |
US20130092952A1 (en) | 2013-04-18 |
US9190507B2 (en) | 2015-11-17 |
US10453948B2 (en) | 2019-10-22 |
JPWO2011161791A1 (ja) | 2013-08-19 |
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