JP2012080111A - 保護層および低損傷陥凹部を備える窒化物ベースのトランジスタならびにその製作方法 - Google Patents
保護層および低損傷陥凹部を備える窒化物ベースのトランジスタならびにその製作方法 Download PDFInfo
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- 239000011241 protective layer Substances 0.000 title claims abstract description 142
- 150000004767 nitrides Chemical class 0.000 title claims abstract description 69
- 238000004519 manufacturing process Methods 0.000 title claims description 22
- 239000010410 layer Substances 0.000 claims abstract description 305
- 230000004888 barrier function Effects 0.000 claims abstract description 120
- 239000004065 semiconductor Substances 0.000 claims abstract description 32
- 229910052751 metal Inorganic materials 0.000 claims abstract description 25
- 239000002184 metal Substances 0.000 claims abstract description 25
- 238000000137 annealing Methods 0.000 claims abstract description 15
- 229910002601 GaN Inorganic materials 0.000 claims description 43
- 238000002161 passivation Methods 0.000 claims description 41
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 claims description 37
- 238000000034 method Methods 0.000 claims description 37
- 239000000758 substrate Substances 0.000 claims description 27
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims description 23
- 238000005530 etching Methods 0.000 claims description 23
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 16
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 10
- RNQKDQAVIXDKAG-UHFFFAOYSA-N aluminum gallium Chemical compound [Al].[Ga] RNQKDQAVIXDKAG-UHFFFAOYSA-N 0.000 claims description 10
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 10
- AJGDITRVXRPLBY-UHFFFAOYSA-N aluminum indium Chemical compound [Al].[In] AJGDITRVXRPLBY-UHFFFAOYSA-N 0.000 claims description 8
- 235000012239 silicon dioxide Nutrition 0.000 claims description 8
- 239000000377 silicon dioxide Substances 0.000 claims description 8
- 239000002356 single layer Substances 0.000 claims description 6
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 claims description 5
- 229910052738 indium Inorganic materials 0.000 claims description 5
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 5
- 238000001039 wet etching Methods 0.000 claims description 2
- -1 AlGaN Chemical compound 0.000 claims 1
- 239000000463 material Substances 0.000 description 29
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 15
- 230000015572 biosynthetic process Effects 0.000 description 14
- 229910010271 silicon carbide Inorganic materials 0.000 description 14
- 238000010586 diagram Methods 0.000 description 11
- 229910004298 SiO 2 Inorganic materials 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 230000007704 transition Effects 0.000 description 6
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 238000005229 chemical vapour deposition Methods 0.000 description 5
- 238000000151 deposition Methods 0.000 description 5
- 229920002120 photoresistant polymer Polymers 0.000 description 5
- 238000005240 physical vapour deposition Methods 0.000 description 5
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 229910052681 coesite Inorganic materials 0.000 description 4
- 229910052906 cristobalite Inorganic materials 0.000 description 4
- 238000001020 plasma etching Methods 0.000 description 4
- 229910052682 stishovite Inorganic materials 0.000 description 4
- 229910052905 tridymite Inorganic materials 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000009616 inductively coupled plasma Methods 0.000 description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 230000006911 nucleation Effects 0.000 description 3
- 238000010899 nucleation Methods 0.000 description 3
- 229910052594 sapphire Inorganic materials 0.000 description 3
- 239000010980 sapphire Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 238000004544 sputter deposition Methods 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- 238000002488 metal-organic chemical vapour deposition Methods 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- 229910005889 NiSix Inorganic materials 0.000 description 1
- 229910004205 SiNX Inorganic materials 0.000 description 1
- 229910008807 WSiN Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910021431 alpha silicon carbide Inorganic materials 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002248 hydride vapour-phase epitaxy Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 238000000623 plasma-assisted chemical vapour deposition Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- HYXGAEYDKFCVMU-UHFFFAOYSA-N scandium oxide Chemical compound O=[Sc]O[Sc]=O HYXGAEYDKFCVMU-UHFFFAOYSA-N 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 230000005533 two-dimensional electron gas Effects 0.000 description 1
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Abstract
【解決手段】パターニングされたオーム性接触金属領域が、バリア層上に形成され、第1および第2のオーム性接触を形成するためにアニールされる。アニールは、保護層をゲート領域上に載せたままで実施される。バリア層のゲート領域上に、ゲート接点も形成される。ゲート領域内に保護層を有するトランジスタも形成され、バリア層の成長させたままのシート抵抗と実質的に同じシート抵抗をもつバリア層を有するトランジスタも同様である。
【選択図】図1C
Description
窒化物ベースのトランジスタの製作における1つの段階は、そうしたトランジスタ用のオーム性接触の形成である。オーム性接触の形成には一般に、高アニール温度(例えば900℃)が必要とされてきた。そうした高アニール温度は、材料および/またはデバイスに損傷を与えることがある。
本発明の諸実施形態では、トランジスタなどの半導体デバイス中で、ゲート漏れ電流を低減させ、かつ/または高品質のショットキー接点を形成するために、保護層および/または低損傷陥凹部の製作技術を利用する。保護層を使用することにより、デバイスのオーム性接触のアニール中に、トランジスタのゲート領域内で半導体が受ける損傷を低減することができる。したがって、オーム性接触の形成に起因するゲート領域の品質低下が低減された、高品質のゲート接点およびオーム性接触を形成することができる。
Claims (35)
- 基板上にある、窒化物ベースのチャネル層と、
前記窒化物ベースのチャネル層上にあり、窒化物ベースの半導体バリア層の成長させたままのシート抵抗と実質的に同じシート抵抗を有する、窒化物ベースの半導体バリア層と、
前記バリア層上にある、複数のオーム性接触と、
前記バリア層上にある、ゲート接点とを備えることを特徴とする高電子移動度トランジスタ。 - 前記オーム性接触に隣接すると共にそれから離隔され、また前記ゲート接点が中を貫通して延びる、前記バリア層上に配設された保護層をさらに備えることを特徴とする請求項1に記載の高電子移動度トランジスタ。
- 前記保護層上にあり、前記オーム性接触と前記保護層の間の隙間を実質的に埋める、パッシベーション層をさらに備えることを特徴とする請求項2に記載の高電子移動度トランジスタ。
- 前記パッシベーション層は、前記保護層上にもあり、前記ゲート接点は、前記保護層および前記パッシベーション層を貫通して延びることを特徴とする請求項3に記載の高電子移動度トランジスタ。
- 前記ゲート接点の少なくとも一部分は直接前記保護層上にあり、前記ゲート接点の一部分は、直接前記バリア層上にあることを特徴とする請求項3に記載の高電子移動度トランジスタ。
- 前記オーム性接触と前記ゲート接点の間の隙間を実質的に埋める、前記バリア層上のパッシベーション層をさらに備えることを特徴とする請求項1に記載の高電子移動度トランジスタ。
- 前記窒化物ベースのチャネル層は、III族窒化物層を含み、
前記窒化物ベースの半導体バリア層は、III族窒化物層を含むことを特徴とする請求項1に記載の高電子移動度トランジスタ。 - 前記チャネル層は、前記バリア層よりも低いバンドギャップを有することを特徴とする請求項1に記載の高電子移動度トランジスタ。
- 前記チャネル層は、約20Åを超える厚さを有する非ドープ層を含むことを特徴とする請求項1に記載の高電子移動度トランジスタ。
- 前記チャネル層は、超格子および/またはIII族窒化物層の組合せを有することを特徴とする請求項1に記載の高電子移動度トランジスタ。
- 前記チャネル層は、窒化アルミニウムガリウム(AlGaN)、窒化ガリウム(GaN)、窒化インジウムガリウム(InGaN)、および/または窒化アルミニウムインジウムガリウム(AlInGaN)を含み、
前記バリア層は、窒化アルミニウム(AlN)、窒化アルミニウムインジウム(AlInN)、AlGaN、GaN、InGaN、および/またはAlInGaNを含むことを特徴とする請求項1に記載の高電子移動度トランジスタ。 - 前記バリア層は、AlxGa1−xN(ただし0<x<1)を含むことを特徴とする請求項1に記載の高電子移動度トランジスタ。
- 前記バリア層は、複数の層を含むことを特徴とする請求項1に記載の高電子移動度トランジスタ。
- 前記基板上にバッファ層をさらに備え、前記窒化物ベースのチャネル層は、前記バッファ層上に配設されることを特徴とする請求項1に記載の高電子移動度トランジスタ。
- 前記保護層は、少なくとも前記オーム性接触と同程度の厚さを有することを特徴とする請求項2に記載の高電子移動度トランジスタ。
- 前記オーム性接触は、約1Ω−mm未満の接点抵抗を有することを特徴とする請求項1に記載の高電子移動度トランジスタ。
- 基板上にある、窒化物ベースのチャネル層と、
前記窒化物ベースのチャネル層上にある、窒化物ベースの半導体バリア層と、
前記バリア層上にある、保護層と、
前記バリア層上にあり、オーム性接触と前記保護層の間の隙間を設けるように、前記保護層に隣接すると共にそれから離隔される複数のオーム性接触と、
前記バリア層上にあり、前記保護層を貫通して延びるゲート接点とを備えることを特徴とする高電子移動度トランジスタ。 - 前記保護層上にあり、前記オーム性接触と前記保護層の間の前記隙間を実質的に埋める、パッシベーション層をさらに備えることを特徴とする請求項17に記載の高電子移動度トランジスタ。
- 前記窒化物ベースのチャネル層は、III族窒化物層を含み、
前記窒化物ベースの半導体バリア層は、III族窒化物層を含むことを特徴とする請求項17に記載の高電子移動度トランジスタ。 - 前記チャネル層は、前記バリア層よりも低いバンドギャップを有することを特徴とする請求項17に記載の高電子移動度トランジスタ。
- 前記チャネル層は、約20Åを超える厚さを有する非ドープ層を含むことを特徴とする請求項17に記載の高電子移動度トランジスタ。
- 前記チャネル層は、超格子および/またはIII族窒化物層の組合せを有することを特徴とする請求項17に記載の高電子移動度トランジスタ。
- 前記チャネル層は、窒化アルミニウムガリウム(AlGaN)、窒化ガリウム(GaN)、窒化インジウムガリウム(InGaN)、および/または窒化アルミニウムインジウムガリウム(AlInGaN)を含み、
前記バリア層は、窒化アルミニウム(AlN)、窒化アルミニウムインジウム(AlInN)、AlGaN、GaN、InGaN、および/またはAlInGaNを含むことを特徴とする請求項17に記載の高電子移動度トランジスタ。 - 前記バリア層は、AlxGa1−xN(ただし0<x<1)を含むことを特徴とする請求項17に記載の高電子移動度トランジスタ。
- 前記バリア層は、複数の層を含むことを特徴とする請求項17に記載の高電子移動度トランジスタ。
- 前記基板上にバッファ層をさらに備え、前記窒化物ベースのチャネル層は、前記バッファ層上に配設されることを特徴とする請求項17に記載の高電子移動度トランジスタ。
- 前記保護層は、少なくとも前記オーム性接触と同程度の厚さであることを特徴とする請求項17に記載の高電子移動度トランジスタ。
- 前記ゲート接点は、直接前記保護層上にあることを特徴とする請求項27に記載の高電子移動度トランジスタ。
- 前記保護層は、単層約2枚分の厚さを有することを特徴とする請求項17に記載の高電子移動度トランジスタ。
- 窒化物ベースの半導体チャネル層上に、窒化物ベースの半導体バリア層を形成すること、
前記窒化物ベースの半導体バリア層のゲート領域上に、保護層を形成すること、
前記バリア層上に、パターニングされた複数のオーム性接触金属領域を形成すること、
第1および第2のオーム性接触を形成するために、前記パターニングされたオーム性接触金属をアニールすること、
前記バリア層のゲート領域の一部分を露出させるために、低損傷エッチング技術を利用して、前記バリア層の前記ゲート領域内の前記保護層に陥凹部をエッチングすること、および
前記パッシベーション層の前記陥凹部中に、前記ゲート接点を形成することを含むことを特徴とするトランジスタの製作方法。 - 前記保護層は、パッシベーション層を含むことを特徴とする請求項30に記載の方法。
- 前記保護層は、窒化アルミニウム層、窒化ケイ素層、および/または二酸化ケイ素層を含むことを特徴とする請求項30に記載の方法。
- 前記低損傷エッチング技術は、強塩基を使用する湿式エッチングを含むことを特徴とする請求項30に記載の方法。
- 第1および第2のオーム性接触を形成するために、前記パターニングされたオーム性接触金属をアニールすることは、保護層を形成する前に実施されることを特徴とする請求項30に記載の方法。
- 第1および第2のオーム性接触を形成するために、前記パターニングされたオーム性接触金属をアニールすることは、保護層を形成した後に実施されることを特徴とする請求項30に記載の方法。
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- 2004-09-28 CN CNB2004800405318A patent/CN100468770C/zh active Active
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Also Published As
Publication number | Publication date |
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EP2492963A3 (en) | 2013-01-23 |
US20110140123A1 (en) | 2011-06-16 |
EP1704597B1 (en) | 2015-07-22 |
CN1906765A (zh) | 2007-01-31 |
US7045404B2 (en) | 2006-05-16 |
JP2007518265A (ja) | 2007-07-05 |
US20060255366A1 (en) | 2006-11-16 |
US7906799B2 (en) | 2011-03-15 |
KR20060127046A (ko) | 2006-12-11 |
KR101202497B1 (ko) | 2012-11-16 |
JP6050579B2 (ja) | 2016-12-21 |
EP2492963B1 (en) | 2021-03-10 |
EP2492963A2 (en) | 2012-08-29 |
US20050170574A1 (en) | 2005-08-04 |
TW200525760A (en) | 2005-08-01 |
CA2553669A1 (en) | 2005-08-18 |
KR20110075053A (ko) | 2011-07-05 |
CN100468770C (zh) | 2009-03-11 |
US11316028B2 (en) | 2022-04-26 |
WO2005076365A9 (en) | 2006-10-12 |
EP1704597A1 (en) | 2006-09-27 |
JP5156235B2 (ja) | 2013-03-06 |
KR101123459B1 (ko) | 2012-03-26 |
WO2005076365A1 (en) | 2005-08-18 |
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