JP2016529712A - 閾値電圧がマッチングした集積回路およびこれを作製するための方法 - Google Patents
閾値電圧がマッチングした集積回路およびこれを作製するための方法 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims description 18
- 230000004888 barrier function Effects 0.000 claims abstract description 66
- 239000000758 substrate Substances 0.000 claims abstract description 13
- 238000002955 isolation Methods 0.000 claims abstract description 11
- 238000005530 etching Methods 0.000 claims description 7
- 238000000151 deposition Methods 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229920002120 photoresistant polymer Polymers 0.000 claims description 2
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 13
- 229910002601 GaN Inorganic materials 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 7
- 150000004767 nitrides Chemical class 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- RNQKDQAVIXDKAG-UHFFFAOYSA-N aluminum gallium Chemical compound [Al].[Ga] RNQKDQAVIXDKAG-UHFFFAOYSA-N 0.000 description 3
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 238000005468 ion implantation Methods 0.000 description 2
- 229910052594 sapphire Inorganic materials 0.000 description 2
- 239000010980 sapphire Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 230000005533 two-dimensional electron gas Effects 0.000 description 2
- -1 AlGaN Chemical compound 0.000 description 1
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 1
- AUCDRFABNLOFRE-UHFFFAOYSA-N alumane;indium Chemical compound [AlH3].[In] AUCDRFABNLOFRE-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
Description
1.本発明の分野:
本発明は、一般的には集積回路およびデバイスに、およびより特には、エンハンスメントモードおよびデプレーション(depletion)モードデバイスの閾値電圧をマッチングさせること、および窒化ガリウム(GaN)デバイスの出力キャパシタンスを低減させることに関する。
GaN半導体デバイスは、高周波で切り替わる、大電流を搬送する、および高電圧を維持する(support high voltages)その能力のために、ますます所望される。これらのデバイスの発展は、一般的には、高出力/高周波用途を目的としてきた。これらのタイプの用途のために作製されたデバイスは、高電子移動度を示す一般的デバイス構造に基づき、ヘテロ接合電界効果トランジスタ(HFET)、高電子移動度トランジスタ(HEMT)または変調ドープ電界効果トランジスタ(MODFET)と広く称される。これらのタイプのデバイスは、典型的には、例えば30V〜2000ボルトなどの高電圧に耐え、一方で、例えば100kHz〜100GHzなどの高周波で操作することができる。
以下に記載される実施形態は、エンハンスメントモードデバイスおよびデプレーションモードデバイスを有する集積回路を提供することにより、上記で検討された問題および他の問題に対処し、前記集積回路は、ゲートの下の窒化アルミニウムガリウム(AlGaN)バリア層中に、2つのデバイスを分離する分離領域およびより薄い領域またはゲートコンタクト凹部を含み、これを使用してエンハンスメントモードおよびデプレーションモードデバイスの閾値電圧VThを変調することができ、これにより、閾値電圧の絶対値がおよそ等しくなる。
本開示の上記のおよび他の特徴、目的、および利点は、同類の参照記号が本願を通じて対応して同定する図面と合わせる場合に、以下に記載の詳細な説明からより明らかにされるであろう:
以下の詳細な説明において、特定の実施形態が参照される。これらの実施形態は、十分に詳細に説明され、当業者がそれらを実施することを可能にする。他の実施形態を用いてもよいこと、および種々の構造的、論理的および電気的変更がなされ得ることが理解されなければならない。以下の詳細な説明において開示される特徴の組み合わせは、最も広い意味における教示を実行するために必要でなくてもよく、その代わりに単に教示されて、本願の教示の代表的な例を特に説明する。
Claims (17)
- 以下:
基板;
前記基板にわたって形成された少なくとも1つのバッファー層;
前記少なくとも1つのバッファー層にわたって形成されたGaNチャネル層;
前記GaNチャネル層にわたって形成されたバリア層;
第1のトランジスタデバイスのための前記バリア層の第1の一部分を、第2のトランジスタデバイスのための前記バリア層の第2の一部分と分離する分離領域であって、前記バリア層の前記第1のおよび第2の一部分は、それぞれ個別にゲートコンタクト凹部を有する、分離領域;
前記第1のトランジスタデバイスのための前記バリア層の前記第1の一部分の前記ゲートコンタクト凹部に少なくとも部分的に位置された第1のゲートコンタクト;および
前記第2のトランジスタデバイスのための前記バリア層の前記第2の一部分の前記ゲートコンタクト凹部に少なくとも部分的に位置された第2のゲートコンタクト、
を含む、集積回路。 - 前記第1のゲートコンタクトが、前記第1のトランジスタデバイスのための前記バリア層の前記第1の一部分の前記ゲートコンタクト凹部の全幅に伸びている、請求項1に記載の集積回路。
- 前記第2のゲートコンタクトが、前記第2のトランジスタデバイスのための前記バリア層の前記第2の一部分の前記ゲートコンタクト凹部の全幅に伸びている、請求項1に記載の集積回路。
- 以下:
前記バリア層の前記第1の一部分上の第1のソースおよびドレインコンタクト;および
前記バリア層の前記第2の一部分上の第2のソースおよびドレインコンタクト、
をさらに含む、請求項1に記載の集積回路。 - 前記第1のおよび第2のゲートコンタクトおよび前記バリア層の前記第1のおよび第2の一部分にわたって位置された誘電体層をさらに含む、請求項4に記載の集積回路。
- 前記バリア層の前記第1のおよび第2の一部分にわたって位置された第1のおよび第2のフィールドプレートをさらに含む、請求項5に記載の集積回路。
- 前記第1のトランジスタデバイスが、エンハンスメントモードであり、前記第2のトランジスタデバイスが、デプレーションモードデバイスである、請求項6に記載の集積回路。
- 前記エンハンスメントモードデバイスの閾値電圧の絶対値が、前記デプレーションモードデバイスの閾値電圧の絶対値におよそ等しい、請求項7に記載の集積回路。
- 前記第1のゲートコンタクトが、前記第1のトランジスタデバイスのための前記バリア層の前記第1の一部分の前記ゲートコンタクト凹部の全幅に伸び、前記第2のゲートコンタクトが、前記第2のトランジスタデバイスのための前記バリア層の前記第2の一部分の前記ゲートコンタクト凹部の全幅に伸びている、請求項7に記載の集積回路。
- 前記個別のゲートコンタクト凹部が、前記個別の第1のおよび第2のゲートコンタクトにより覆われていない一部分をそれぞれ含む、請求項7に記載の集積回路。
- 前記バリア層が、第1の厚さを有し、前記バリア層の前記ゲートコンタクト凹部が、前記第1の厚さより小さい第2の厚さを有する、請求項1に記載の集積回路。
- 集積回路を作製するための方法であって、前記方法は、以下のステップ:
基板層上で少なくとも1つのバッファー層を形成するステップ;
前記少なくとも1つのバッファー層にわたってバリア層を形成するステップ;
前記バリア層上でフォトレジストを形成するステップ;
前記バリア層をエッチングして、第1のおよび第2のゲートコンタクト凹部を形成するステップ;
前記第1のおよび第2のゲートコンタクト凹部の一方において、第1のゲートコンタクトを形成するステップ;
前記バリア層にわたって誘電体層を堆積するステップ;
前記誘電体層および前記バリア層をエッチングして、前記誘電体層中に複数のコンタクト開口を形成するステップ;および
前記第1のおよび第2のゲートコンタクト凹部間で、前記バリア層中に分離領域を形成するステップ、
を含む、方法。 - 以下のステップ:
前記第1のおよび第2のゲートコンタクト凹部の一方にわたって前記誘電体層を堆積するステップ;および
ショットキー金属を堆積して、前記第1のおよび第2のゲートコンタクト凹部中で第2のゲートコンタクトを形成するステップ、
をさらに含む、請求項12に記載の方法。 - 前記複数のコンタクト開口中に抵抗コンタクト層を堆積して、第1のおよび第2のトランジスタデバイスのための個別のソースおよびドレインコンタクトを形成するステップをさらに含む、請求項13に記載の方法。
- 前記第1のトランジスタデバイスが、エンハンスメントモードであり、前記第2のトランジスタデバイスが、デプレーションモードデバイスである、請求項14に記載の方法。
- 前記第1のおよび第2のゲートコンタクト凹部を形成するための前記バリア層をエッチングするステップが、前記エンハンスメントモードデバイスの閾値電圧の絶対値が、前記デプレーションモードデバイスの閾値電圧の絶対値におよそ等しくなるような厚さを有する、前記第1のおよび第2のゲートコンタクト凹部のそれぞれを形成するステップを含む、請求項15に記載の方法。
- 前記第1のおよび第2のゲートコンタクト凹部の一方において、前記第1のゲートコンタクトを形成するステップが、前記ゲートコンタクト凹部において部分的にのみ前記第1のゲートコンタクトを形成するステップを含む、請求項16に記載の方法。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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US201361859803P | 2013-07-30 | 2013-07-30 | |
US61/859,803 | 2013-07-30 | ||
PCT/US2014/048828 WO2015017513A2 (en) | 2013-07-30 | 2014-07-30 | Integrated circuit with matching threshold voltages and method for making same |
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US9171911B2 (en) * | 2013-07-08 | 2015-10-27 | Efficient Power Conversion Corporation | Isolation structure in gallium nitride devices and integrated circuits |
WO2016157718A1 (ja) * | 2015-04-02 | 2016-10-06 | パナソニック株式会社 | 窒化物半導体装置 |
FR3051072B1 (fr) | 2016-05-04 | 2018-06-01 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Dispositif electronique de puissance a structure d'interconnexion electrique plane |
DE102016123934A1 (de) * | 2016-12-09 | 2018-06-14 | United Monolithic Semiconductors Gmbh | Verfahren zur Herstellung eines Transistors |
TWI660465B (zh) | 2017-07-28 | 2019-05-21 | 新唐科技股份有限公司 | 半導體元件及其製造方法 |
CN110429028B (zh) * | 2019-08-01 | 2021-11-19 | 福建省福联集成电路有限公司 | 一种晶体管器件增强型和耗尽型栅极集成制作方法及器件 |
WO2024092544A1 (en) * | 2022-11-02 | 2024-05-10 | Innoscience (Zhuhai) Technology Co., Ltd. | Nitride-based semiconductor device and method for manufacturing thereof |
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KR20160038035A (ko) | 2016-04-06 |
US9583480B2 (en) | 2017-02-28 |
US20150034962A1 (en) | 2015-02-05 |
KR102249390B1 (ko) | 2021-05-10 |
US20160111416A1 (en) | 2016-04-21 |
DE112014003545T5 (de) | 2016-05-04 |
CN105453273A (zh) | 2016-03-30 |
US9214399B2 (en) | 2015-12-15 |
JP6835581B2 (ja) | 2021-02-24 |
WO2015017513A2 (en) | 2015-02-05 |
TW201513364A (zh) | 2015-04-01 |
TWI615977B (zh) | 2018-02-21 |
CN105453273B (zh) | 2018-11-02 |
WO2015017513A3 (en) | 2015-11-05 |
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