JP2021144993A - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 173
- 150000004767 nitrides Chemical class 0.000 claims abstract description 93
- 230000004888 barrier function Effects 0.000 claims abstract description 52
- 239000000203 mixture Substances 0.000 claims abstract description 47
- 239000012535 impurity Substances 0.000 claims description 6
- 239000010410 layer Substances 0.000 description 310
- 239000007789 gas Substances 0.000 description 47
- 239000000758 substrate Substances 0.000 description 36
- 238000004519 manufacturing process Methods 0.000 description 18
- 238000002161 passivation Methods 0.000 description 16
- 230000015572 biosynthetic process Effects 0.000 description 15
- 238000000034 method Methods 0.000 description 14
- 230000001681 protective effect Effects 0.000 description 13
- 229910002704 AlGaN Inorganic materials 0.000 description 12
- 230000003746 surface roughness Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 10
- 239000003990 capacitor Substances 0.000 description 8
- XCZXGTMEAKBVPV-UHFFFAOYSA-N trimethylgallium Chemical compound C[Ga](C)C XCZXGTMEAKBVPV-UHFFFAOYSA-N 0.000 description 8
- 239000002184 metal Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 description 7
- 238000001312 dry etching Methods 0.000 description 6
- 238000000926 separation method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 229920002120 photoresistant polymer Polymers 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000012159 carrier gas Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 3
- 238000000231 atomic layer deposition Methods 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 3
- 238000005530 etching Methods 0.000 description 3
- 239000012299 nitrogen atmosphere Substances 0.000 description 3
- 229910000679 solder Inorganic materials 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 229910052735 hafnium Inorganic materials 0.000 description 2
- 238000000206 photolithography Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
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- 229910052715 tantalum Inorganic materials 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 230000005533 two-dimensional electron gas Effects 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
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- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000005468 ion implantation Methods 0.000 description 1
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
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- 229910000077 silane Inorganic materials 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
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Abstract
Description
先ず、量子閉じ込め構造トランジスタの概要について説明する。図1は、量子閉じ込め構造トランジスタを含む参考例に係る半導体装置を示す断面図である。
第1実施形態について説明する。第1実施形態は、量子閉じ込め構造の高電子移動度トランジスタ(high electron mobility transistor:HEMT)を含む半導体装置に関する。図4は、第1実施形態に係る半導体装置を示す断面図である。
基板101とバッファ層102との間に窒化物半導体層が含まれていてもよい。図11は、第1実施形態の変形例に係る半導体装置を示す断面図である。
第2実施形態について説明する。第2実施形態は、量子閉じ込め構造のHEMTを含む半導体装置に関する。図12は、第2実施形態に係る半導体装置を示す断面図である。
第3実施形態について説明する。第3実施形態は、量子閉じ込め構造のHEMTを含む半導体装置に関する。図17は、第3実施形態に係る半導体装置を示す断面図である。
次に、第4実施形態について説明する。第4実施形態は、HEMTのディスクリートパッケージに関する。図21は、第4実施形態に係るディスクリートパッケージを示す図である。
次に、第5実施形態について説明する。第5実施形態は、HEMTを備えたPFC(Power Factor Correction)回路に関する。図22は、第5実施形態に係るPFC回路を示す結線図である。
次に、第6実施形態について説明する。第6実施形態は、サーバ電源に好適な、HEMTを備えた電源装置に関する。図23は、第6実施形態に係る電源装置を示す結線図である。
次に、第7実施形態について説明する。第7実施形態は、HEMTを備えた増幅器に関する。図24は、第7実施形態に係る増幅器を示す結線図である。
(付記1)
第1窒化物半導体の下地と、
前記下地の上方に設けられた第2窒化物半導体のバッファ層と、
前記バッファ層の上方に設けられ、開口部が形成された第3窒化物半導体のチャネル層と、
前記チャネル層の上方に設けられた第4窒化物半導体のバリア層と、
前記開口部内に設けられ、前記バッファ層及び前記チャネル層と接触し、導電性を備えた第5窒化物半導体のコンタクト層と、
を有し、
前記第2窒化物半導体のAl組成は、前記第3窒化物半導体のAl組成以上であり、
前記第1窒化物半導体及び前記第4窒化物半導体のAl組成は、前記第2窒化物半導体のAl組成より高いことを特徴とする半導体装置。
(付記2)
前記下地の表面が(0001)面であることを特徴とする付記1に記載の半導体装置。
(付記3)
前記第2窒化物半導体の前記コンタクト層と接する面での組成は、Alx1Ga1−x1N(0.00≦x1≦0.20)で表されることを特徴とする付記1又は2に記載の半導体装置。
(付記4)
前記第3窒化物半導体及び前記第5窒化物半導体は、Gaを含むことを特徴とする付記1乃至3のいずれか1項に記載の半導体装置。
(付記5)
前記第3窒化物半導体及び前記第5窒化物半導体は、GaNであることを特徴とする付記1乃至4のいずれか1項に記載の半導体装置。
(付記6)
前記第4窒化物半導体の組成は、Iny2Alx2Ga1−x2−y2N(0.00≦x2≦1.00、0.00≦y2≦0.20)で表されることを特徴とする付記1乃至5のいずれか1項に記載の半導体装置。
(付記7)
前記チャネル層の厚さが50nm以下であることを特徴とする付記1乃至6のいずれか1項に記載の半導体装置。
(付記8)
前記第5窒化物半導体は、1×1017cm−3〜5×1020cm−3の濃度でn型不純物を含有することを特徴とする付記1乃至7のいずれか1項に記載の半導体装置。
(付記9)
前記第5窒化物半導体は、n型不純物としてSi、Ge若しくはO又はこれらの任意の組み合わせを含有することを特徴とする付記1乃至8のいずれか1項に記載の半導体装置。
(付記10)
前記コンタクト層上に設けられた電極を有することを特徴とする付記1乃至9のいずれか1項に記載の半導体装置。
(付記11)
前記下地は、
基板と、
前記基板上に設けられた第6窒化物半導体の第3層と、
を有することを特徴とする付記1乃至10のいずれか1項に記載の半導体装置。
(付記12)
前記バッファ層の前記コンタクト層の下の部分は、前記チャネル層の下の部分より薄いことを特徴とする付記1乃至11のいずれか1項に記載の半導体装置。
(付記13)
付記1乃至12のいずれか1項に記載の半導体装置を有することを特徴とする増幅器。
(付記14)
付記1乃至12のいずれか1項に記載の半導体装置を有することを特徴とする電源装置。
101:基板
102、302:バッファ層
103:チャネル層
104:バリア層
106:ソース電極
107:ドレイン電極
109:ゲート電極
112d:コンタクト層
112s:コンタクト層
191:中間層
205:キャップ層
302A:第1層
302B:第2層
Claims (7)
- 第1窒化物半導体の下地と、
前記下地の上方に設けられた第2窒化物半導体のバッファ層と、
前記バッファ層の上方に設けられ、開口部が形成された第3窒化物半導体のチャネル層と、
前記チャネル層の上方に設けられた第4窒化物半導体のバリア層と、
前記開口部内に設けられ、前記バッファ層及び前記チャネル層と接触し、導電性を備えた第5窒化物半導体のコンタクト層と、
を有し、
前記第2窒化物半導体のAl組成は、前記第3窒化物半導体のAl組成以上であり、
前記第1窒化物半導体及び前記第4窒化物半導体のAl組成は、前記第2窒化物半導体のAl組成より高いことを特徴とする半導体装置。 - 前記下地の表面が(0001)面であることを特徴とする請求項1に記載の半導体装置。
- 前記第2窒化物半導体の前記コンタクト層と接する面での組成は、Alx1Ga1−x1N(0.00≦x1≦0.20)で表されることを特徴とする請求項1又は2に記載の半導体装置。
- 前記第3窒化物半導体及び前記第5窒化物半導体は、GaNであることを特徴とする請求項1乃至3のいずれか1項に記載の半導体装置。
- 前記第4窒化物半導体の組成は、Iny2Alx2Ga1−x2−y2N(0.00≦x2≦1.00、0.00≦y2≦0.20)で表されることを特徴とする請求項1乃至4のいずれか1項に記載の半導体装置。
- 前記チャネル層の厚さが50nm以下であることを特徴とする請求項1乃至5のいずれか1項に記載の半導体装置。
- 前記第5窒化物半導体は、1×1017cm−3〜5×1020cm−3の濃度でn型不純物を含有することを特徴とする請求項1乃至6のいずれか1項に記載の半導体装置。
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