JP7383168B2 - 縦型電界効果トランジスタおよびその形成方法 - Google Patents
縦型電界効果トランジスタおよびその形成方法 Download PDFInfo
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- JP7383168B2 JP7383168B2 JP2022549450A JP2022549450A JP7383168B2 JP 7383168 B2 JP7383168 B2 JP 7383168B2 JP 2022549450 A JP2022549450 A JP 2022549450A JP 2022549450 A JP2022549450 A JP 2022549450A JP 7383168 B2 JP7383168 B2 JP 7383168B2
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- 230000005669 field effect Effects 0.000 title claims description 51
- 238000000034 method Methods 0.000 title claims description 12
- 230000015572 biosynthetic process Effects 0.000 title description 2
- 239000004065 semiconductor Substances 0.000 claims description 148
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 230000005684 electric field Effects 0.000 description 7
- 239000000758 substrate Substances 0.000 description 7
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 5
- 239000002800 charge carrier Substances 0.000 description 4
- 229910010271 silicon carbide Inorganic materials 0.000 description 4
- 229910002601 GaN Inorganic materials 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
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Description
第2の半導体フィン10とドリフト領域2の間には、シールド構造4が、例えばp型ドーピングされた範囲4の形態で形成されている。シールド構造4は、ソースコンタクト7に電気的に接続されていてもよい。シールド構造4は、第2の半導体フィン10および第2の半導体フィン10の周りに延びているゲート誘電体9を、遮断動作中に発生し得る電界に対してシールドする。シールド構造4は、電流フローが第2の半導体フィン10を通って水平に生じ、かつ第1の半導体フィン11内で初めて垂直に進むことを可能にする。
図4Aは、様々な実施形態に基づく1つの縦型電界効果トランジスタ20の概略的な透視図を示し、図4Bは、図4Aの概略的な断面図を示している。図4Aで図解された縦型電界効果トランジスタ20は、図2A~図2Dで図解し、上で詳細に説明されている縦型電界効果トランジスタ20と同一であり得る。
図3で説明されたように、電流は、様々な実施形態において第1の半導体フィン11を通ってのみ下へ導かれる。一実施形態では、第1の半導体フィン11が、第2の半導体フィン10に比べてより高くn型ドーピングされた第1の区域50およびより低くn型ドーピングされた第2の区域51を有し得る(図5A)。第1の区域50は、シールド構造4の横隣りに形成されていてもよい。第1の区域50は、シールド構造と同じ厚さを有することができ(図5A)、またはシールド構造とは違う厚さを有することができる。別の一実施形態では、第1の半導体フィン11全体が、(第2の半導体フィン10のドーピングに比べて)より高いn型ドーピングを有し得る(図5B)。
Claims (11)
- ドリフト領域(2)と、
前記ドリフト領域(2)の上または上方にあり、前記ドリフト領域(2)と導電性につながれた第1の半導体フィン(11)と、
前記ドリフト領域(2)の上または上方にある多数の第2の半導体フィン(10)であって、前記ドリフト領域(2)と導電性につながらないように形成されており、前記第1の半導体フィン(11)の少なくとも1つの側壁の横隣りに配置されており、前記第1の半導体フィン(11)と導電性につながれている、第2の半導体フィン(10)と、
前記多数の第2の半導体フィン(10)と導電性につながれているソース/ドレイン電極(7)と、
を有する縦型電界効果トランジスタ(20)。 - 前記第1の半導体フィン(11)が、第1の側壁および前記第1の側壁に向かい合う第2の側壁を有し、かつ前記多数の第2の半導体フィン(10)が、前記第1の半導体フィン(11)の前記第1の側壁および前記第2の側壁の横隣りに配置されており、前記第1の側壁および前記第2の側壁と導電性につながれている、請求項1に記載の縦型電界効果トランジスタ(20)。
- 前記多数の第2の半導体フィン(10)と前記ドリフト領域(2)の間に形成されているシールド構造(4)をさらに有する、請求項1または2に記載の縦型電界効果トランジスタ(20)。
- 前記シールド構造(4)が前記ソース/ドレイン電極(7)と導電性につながれている、請求項3に記載の縦型電界効果トランジスタ(20)。
- 前記第1の半導体フィン(11)が、前記シールド構造(4)の横隣りに形成されている第1の区域(50)を有し、かつ前記第2の半導体フィン(10)の横隣りに配置されている第2の区域(51)を有し、前記第1の区域(50)が前記第2の区域(51)より強くドーピングされて形成されている、請求項3または4に記載の縦型電界効果トランジスタ(20)。
- 前記シールド構造(4)がそれぞれ、第2の半導体フィンの底が垂直方向において前記第1の半導体フィンの底より上に配置されているように、前記第2の半導体フィン(10)の方向に延びる、請求項3~5のいずれか一項に記載の縦型電界効果トランジスタ(20)。
- 前記第2の半導体フィン(10)がそれぞれ、前記ドリフト領域(2)に最も近い第1の区域を有し、かつ前記第1の区域の上に第2の区域を有し、どの第2の半導体フィン(10)も、前記第1の区域では第1の横方向の広がりを有し、かつ前記第2の区域では、前記第1の横方向の広がりより小さい第2の横方向の広がりを有する、請求項3~6のいずれか一項に記載の縦型電界効果トランジスタ(20)。
- 前記多数の第2の半導体フィン(10)と導電性につながれている結合構造(60)をさらに有し、前記結合構造(60)が、前記第1の半導体フィン(11)の前記少なくとも1つの側壁から離隔されている、請求項1~7のいずれか一項に記載の縦型電界効果トランジスタ(20)。
- 前記ソース/ドレイン電極(7)と前記第2の半導体フィン(10)の各々との間に形成されている接続領域(3)をさらに有し、前記接続領域(3)が、前記第2の半導体フィン(10)より高い導電率を有する、請求項1~8のいずれか一項に記載の縦型電界効果トランジスタ(20)。
- 前記接続領域(3)が、それぞれ1つの第2の半導体フィン(10)の方向に延びて前記第2の半導体フィン(10)のそれぞれ1つと導電性につながれている多数の第1の区域(61)を有し、かつ前記第1の区域(61)の横隣りに配置されており、前記多数の第1の区域(61)と前記ソース/ドレイン電極(7)とを相互につなぐ第2の区域(62)を有する、請求項9に記載の縦型電界効果トランジスタ(20)。
- 縦型電界効果トランジスタ(20)を形成するための方法(700)であって、
ドリフト領域(2)を形成するステップ(710)と、
前記ドリフト領域(2)の上または上方にあり、前記ドリフト領域(2)と導電性につながれた第1の半導体フィン(11)を形成するステップ(720)と、
前記ドリフト領域(2)の上または上方にある多数の第2の半導体フィン(10)を形成するステップ(730)であって、前記多数の第2の半導体フィン(10)が、前記ドリフト領域(2)と導電性につながらないように形成され、前記多数の第2の半導体フィン(10)が、前記第1の半導体フィンの少なくとも1つの側壁の横隣りに配置されて、前記第1の半導体フィンと導電性につながれるステップと、
前記多数の第2の半導体フィン(10)と導電性につながれるソース/ドレイン電極(7)を形成するステップ(740)と、
を有する方法(700)。
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US20160172482A1 (en) | 2014-12-10 | 2016-06-16 | Alpha And Omega Semiconductor Incorporated | Integrating enhancement mode depleted accumulation/inversion channel devices with mosfets |
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US20070004149A1 (en) | 2003-10-30 | 2007-01-04 | Helmut Tews | Method for producing a vertical field effect transistor |
US20160071974A1 (en) | 2014-09-08 | 2016-03-10 | Infineon Technologies Ag | Semiconductor device with control structure including buried portions and method of manufacturing |
US20160172482A1 (en) | 2014-12-10 | 2016-06-16 | Alpha And Omega Semiconductor Incorporated | Integrating enhancement mode depleted accumulation/inversion channel devices with mosfets |
JP2019207906A (ja) | 2018-05-28 | 2019-12-05 | 株式会社日立製作所 | 半導体装置及びその製造方法、電力変換装置、3相モータシステム、自動車、並びに鉄道車両 |
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