JP2019047122A - 電界効果トランジスタ及び電界効果トランジスタを製造する方法 - Google Patents
電界効果トランジスタ及び電界効果トランジスタを製造する方法 Download PDFInfo
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- 230000005669 field effect Effects 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 claims abstract description 123
- 229910002601 GaN Inorganic materials 0.000 claims abstract description 99
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 14
- RNQKDQAVIXDKAG-UHFFFAOYSA-N aluminum gallium Chemical compound [Al].[Ga] RNQKDQAVIXDKAG-UHFFFAOYSA-N 0.000 claims description 10
- 239000010410 layer Substances 0.000 description 94
- 239000000758 substrate Substances 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical group C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000005530 etching 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
- 239000007943 implant Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
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Abstract
Description
窒化ガリウム層を有する縦型電界効果トランジスタは、高い逆電圧を、同時に低いオン抵抗のもとで可能にする。この種の電界効果トランジスタは、通常、窒化アルミニウムガリウム(AlGaN)層及び窒化ガリウム(GaN)層を有する。電気抵抗を最小化するためには、高導電性の中間層を、電界効果トランジスタの窒化アルミニウムガリウム層と窒化ガリウム層との間の境界面にチャネルとして使用することができる。相互接続なしでは、この種のチャネルは、導電性(常時閉)である。ゲート電圧を印加することにより、電流通流を中断することができる。しかしながら、安全上の理由から、特に自動車分野への適用に対しては、駆動制御なしで非導電性(常時開)であるチャネルの実施形態が必要である。
本発明は、請求項1の特徴を有する縦型電界効果トランジスタ、及び、請求項8の特徴を有する電界効果トランジスタを製造する方法を提供する。
ドープされていない窒化ガリウム層とその上に存在する窒化アルミニウムガリウム層との間の境界面に、p型ドープされた窒化ガリウム層を直接成長させることは、常時開動作を提供するために従来技術から公知であり、当該導電性AlGaN/GaN中間層の移動度を低減させることに結び付けることが可能である。それに対して、本発明は、p型ドープされた窒化ガリウム構造体が、ドープされていない窒化ガリウム層内に埋め込まれる、電界効果トランジスタを提供している。これにより、ドープされていない窒化ガリウム層の境界面を少なくすることができるようになると共に、このことは、常時開動作を可能にさせ、さらに、ゲート端子の下方で局所的な電界強度の上昇を回避することもできるようになる。
図1には、本発明の第1の実施形態による縦型電界効果トランジスタ1aにおける概略的断面図が示されている。この電界効果トランジスタは、HEMTとして構成されており、第1の接触接続側14と、対向する第2の接触接続側15とを有しており、これらの接触接続側の間には、複数の層が形成されおり、それらの層は、以下においてより詳細に説明する。
Claims (10)
- 縦型電界効果トランジスタ(1a〜1d)であって、
前記電界効果トランジスタ(1a〜1d)の第1の接触接続側(14)に配置されているゲート端子(2)及びソース端子(3)と、
前記電界効果トランジスタ(1a〜1d)の前記第1の接触接続側(14)に対向する第2の接触接続側(15)に配置されているドレイン端子(4)と、
前記第1の接触接続側(14)と前記第2の接触接続側(15)との間に存在する、ドープされていない窒化ガリウム層(5)と、
を備えている縦型電界効果トランジスタ(1a〜1d)において、
前記ドープされていない窒化ガリウム層(5)内に、p型ドープされた窒化ガリウム構造体(6a〜6d)が埋め込まれていることを特徴とする、縦型電界効果トランジスタ(1a〜1d)。 - 前記ゲート端子(2)は、多結晶シリコンから成る層(7)を有している、請求項1に記載の電界効果トランジスタ(1a〜1d)。
- 前記多結晶シリコンから成る層(7)は、トレンチ溝(12)内に配置されている、請求項2に記載の電界効果トランジスタ(1a〜1d)。
- 前記ドープされていない窒化ガリウム層(5)の、前記第1の接触接続側(14)に面する側に、窒化アルミニウムガリウム層(8)が形成されており、前記窒化アルミニウムガリウム層(8)上には、さらにゲート誘電体層(9)が形成されており、前記ゲート誘電体層(9)は、前記ゲート端子(2)と前記ソース端子(3)との間に延在している、請求項1乃至3のいずれか一項に記載の電界効果トランジスタ(1a〜1d)。
- 前記ドープされていない窒化ガリウム層(5)の、前記第2の接触接続側(15)に面する側に、n型ドープされた窒化ガリウム層(10)が形成されている、請求項1乃至4のいずれか一項に記載の電界効果トランジスタ(1a〜1d)。
- 前記埋め込まれたp型ドープされた窒化ガリウム構造体(6a〜6d)は、少なくとも部分的に、前記n型ドープされた窒化ガリウム層(10)内に延在している、請求項5に記載の電界効果トランジスタ(1a〜1d)。
- 前記埋め込まれたp型ドープされた窒化ガリウム構造体(6a〜6d)は、前記ドープされていない窒化ガリウム層(5)を貫通して少なくとも1つのチャネル(11)を取り囲み、当該少なくとも1つのチャネル(11)によって、ゲート電圧の印加の際に、前記ドレイン端子(4)への電流通流が可能になる、請求項1乃至6のいずれか一項に記載の電界効果トランジスタ(1a〜1d)。
- 請求項1乃至7のいずれか一項に記載の縦型電界効果トランジスタ(1a〜1d)を製造する方法であって、
p型ドープされた窒化ガリウム構造体(6a〜6d)が埋め込まれたドープされていない窒化ガリウム層(5)を形成するステップと、
前記ドープされていない窒化ガリウム層(5)の第1の側に、ゲート端子(2)及びソース端子(3)を形成するステップと、
前記ドープされていない窒化ガリウム層(5)の前記第1の側に対向する第2の側に、ドレイン端子(4)を配置するステップと、
を含む方法。 - 前記ドープされていない窒化ガリウム層(5)内にトレンチ溝(12)が形成され、該トレンチ溝(12)内に、多結晶シリコンから成るゲート端子(2)の層(7)が形成される、請求項8に記載の方法。
- 前記ドープされていない窒化ガリウム層(5)は、n型ドープされた窒化ガリウム層(10)上に配置され、前記埋め込まれたp型ドープされた窒化ガリウム構造体(6a〜6d)は、少なくとも部分的に、前記n型ドープされた窒化ガリウム層(10)内に形成される、請求項8又は9に記載の方法。
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WO2020184511A1 (ja) | 2019-03-14 | 2020-09-17 | Biodata Bank株式会社 | 温度センサユニット及び体内温度計 |
JP2023513840A (ja) * | 2020-02-18 | 2023-04-03 | ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | 縦型電界効果トランジスタ、それを製造するための方法、および縦型電界効果トランジスタを有するデバイス |
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DE102019212645A1 (de) * | 2019-08-23 | 2021-02-25 | Robert Bosch Gmbh | Vertikaler feldeffekttransistor und verfahren zum herstellen desselben |
DE102019212641A1 (de) * | 2019-08-23 | 2021-02-25 | Robert Bosch Gmbh | Vertikaler feldeffekttransistor und verfahren zum ausbilden desselben |
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JP2023513840A (ja) * | 2020-02-18 | 2023-04-03 | ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | 縦型電界効果トランジスタ、それを製造するための方法、および縦型電界効果トランジスタを有するデバイス |
JP7555420B2 (ja) | 2020-02-18 | 2024-09-24 | ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | 縦型電界効果トランジスタ、それを製造するための方法、および縦型電界効果トランジスタを有するデバイス |
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