JP2011216889A - 凹部バリア層を備えた高電子移動度トランジスタ - Google Patents
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- 230000004888 barrier function Effects 0.000 title claims abstract description 48
- 239000000758 substrate Substances 0.000 claims abstract description 21
- 239000004065 semiconductor Substances 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 21
- AUCDRFABNLOFRE-UHFFFAOYSA-N alumane;indium Chemical compound [AlH3].[In] AUCDRFABNLOFRE-UHFFFAOYSA-N 0.000 claims description 11
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 claims description 10
- 229910002601 GaN Inorganic materials 0.000 claims description 8
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims description 5
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 4
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 4
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 claims description 2
- 125000006850 spacer group Chemical group 0.000 abstract description 37
- 239000000463 material Substances 0.000 description 10
- 238000005530 etching Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- FFEARJCKVFRZRR-UHFFFAOYSA-N methionine Chemical compound CSCCC(N)C(O)=O FFEARJCKVFRZRR-UHFFFAOYSA-N 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
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- 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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- 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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Abstract
【解決手段】基板上104上にバッファ108層を形成し、バッファ層上にスペーサ層112を形成し、スペーサ層上にバリア層116を形成する。バリア層内に凹部を形成し、凹部を通して、少なくてもその一部が前記スペーサ層上に配置されるようにゲート構造140を形成する。
【選択図】図1
Description
本発明は、空軍研究所によって授与された契約番号FA8650−08−C−1443の下で政府支援によって行われた。米国政府は、本発明において特定の権利を有する。
Claims (20)
- 半導体基板上に半導体デバイスを形成する方法であって、
前記半導体基板上にバッファ層を形成するステップと、
前記バッファ層上に窒化アルミニウムスペーサ層を形成するステップと、
前記窒化アルミニウムスペーサ層上にインジウム窒化アルミニウムバリア層を形成するステップと、
前記インジウム窒化アルミニウムバリア層内に凹部を形成するステップと、
前記凹部を通して、少なくともその一部が前記窒化アルミニウムスペーサ層上に配置されるようにゲート構造を形成するステップと、
を備えることを特徴とする方法。 - 前記バッファ層は窒化ガリウムを含むことを特徴とする請求項1に記載に方法。
- 前記凹部は側壁を有し、前記ゲート構造を形成するステップはさらに、
前記凹部を通して配置される少なくともその一部が前記側壁と接触しないように前記ゲート構造を形成するステップを備えることを特徴とする請求項1に記載の方法。 - 前記ゲート構造を形成するステップはさらに、前記インジウム窒化アルミニウムバリア層に接触しないようにゲート構造を形成するステップを備えることを特徴とする請求項1に記載の方法。
- 前記バッファ層上に、ソース構造およびドレイ構造を形成するステップをさらに備えることを特徴とする請求項1に記載の方法。
- 前記ソース構造は、前記窒化アルミニウムスペーサ層および前記インジウム窒化アルミニウムバリア層と直接接触し、前記ドレイン構造は、前記窒化アルミニウムスペーサ層および前記インジウム窒化アルミニウムバリア層と直接接触していることを特徴とする請求項5に記載の方法。
- 前記半導体デバイスは、エンハンスメント型高電子移動度トランジスタ(HEMT)を備えることを特徴とする請求項1に記載の方法。
- 前記半導体基板上で前記エンハンスメント型HEMTと一体化されるようにデプレション型HEMTを形成するステップをさらに備えることを特徴とする請求項7に記載の方法。
- 前記ゲート構造は第1のゲート構造であり、前記デプレション型HEMTを形成するステップはさらに、
前記インジウム窒化アルミニウムバリア層上に第2のゲート構造を形成するステップを備えることを特徴とする請求項8に記載の方法。 - 前記エンハンスメント型HEMTが、第1のソース構造と第1のドレイン構造と前記第1のゲート構造と、を備えるように、前記バッファ層上に前記第1のソース構造と前記第1のドレイン構造を形成するステップと、
前記デプレション型HEMTが、第2のソース構造と第2のドレイン構造と前記第2のゲート構造と、を備えるように、前記バッファ層上に前記第2のソース構造と前記第2のドレイン構造を形成するステップと、
をさらに備えることを特徴とする請求項9に記載の方法。 - 前記第1のソース構造を前記第2のソース構造と一体化するステップをさらに備えることを特徴とする請求項10に記載の方法。
- 半導体基板と、
前記半導体基板上に形成された窒化ガリウム(GaN)層と、
前記GaN層上に形成された窒化アルミニウム(AlN)層と、
前記AlN層上に形成されたインジウム窒化アルミニウム(InAlN)層と、
を備え、前記InAlN層は、その層内に貫通穴を形成する凹部と、
前記凹部を通して、少なくともその一部が前記AlN層上に配置されたゲート構造と、
を有することを特徴とする高電子移動度トランジスタ(HEMT)。 - 前記凹部は側壁を有し、前記凹部を通して配置された前記ゲート構造の一部は前記側壁とは接触していないことを特徴とする請求項12に記載のHEMT。
- 前記GaN層上に形成されたソース構造と、
前記GaN層上のドレイン構造と、
をさらに備えることを特徴とする請求項12に記載のHEMT。 - 前記半導体基板は炭化ケイ素を含むことを特徴とする請求項12に記載のHEMT。
- 前記InAlN層上に形成された第2のゲート構造を備えるデプレション型HEMTと一体化されたエンハンスメント型HEMTを備えることを特徴とする請求項12に記載のHEMT。
- 窒化アルミニウムスペーサ層に形成され、凹部を有するインジウム窒化アルミニウムバリア層と、前記窒化アルミニウムスペーサ層と直接接触するように、少なくとも一部分が前記凹部を通して配置された第1のゲート構造と、を備えるエンハンスメント型高電子移動度トランジスタ(HEMT)と、
前記インジウム窒化アルミニウムバリア層上に配置された第2のゲート構造を備えるデプレション型HEMTと、
を備える半導体デバイス。 - 前記第1のゲート構造は、前記インジウム窒化アルミニウムバリア層と直接接触していないことを特徴とする請求項17に記載の半導体デバイス。
- 前記エンハンスメント型HEMTのソース構造が前記デプレション型HEMTのソース構造に隣接するか、あるいは一体化されるように前記エンハンスメント型HEMTと前記デプレション型HEMTを一体化することを特徴とする請求項17に記載の半導体デバイス。
- その上に前記窒化アルミニウムスペーサ層が形成される窒化ガリウムバッファ層をさらに備えることを特徴とする請求項17に記載の半導体デバイス。
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US12/751,762 US20110241020A1 (en) | 2010-03-31 | 2010-03-31 | High electron mobility transistor with recessed barrier layer |
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JP5756667B2 (ja) | 2015-07-29 |
US20110241020A1 (en) | 2011-10-06 |
TWI555093B (zh) | 2016-10-21 |
TW201145403A (en) | 2011-12-16 |
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