JP7323476B2 - 半導体装置の製造方法 - Google Patents
半導体装置の製造方法 Download PDFInfo
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- JP7323476B2 JP7323476B2 JP2020026568A JP2020026568A JP7323476B2 JP 7323476 B2 JP7323476 B2 JP 7323476B2 JP 2020026568 A JP2020026568 A JP 2020026568A JP 2020026568 A JP2020026568 A JP 2020026568A JP 7323476 B2 JP7323476 B2 JP 7323476B2
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- nitride layer
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- 239000004065 semiconductor Substances 0.000 title claims description 41
- 238000004519 manufacturing process Methods 0.000 title claims description 29
- 150000004767 nitrides Chemical class 0.000 claims description 109
- 238000005530 etching Methods 0.000 claims description 52
- 229920006395 saturated elastomer Polymers 0.000 claims description 43
- 239000002245 particle Substances 0.000 claims description 34
- 125000001246 bromo group Chemical group Br* 0.000 claims description 28
- 150000002259 gallium compounds Chemical class 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 24
- 125000001309 chloro group Chemical group Cl* 0.000 claims description 23
- XOYLJNJLGBYDTH-UHFFFAOYSA-M chlorogallium Chemical compound [Ga]Cl XOYLJNJLGBYDTH-UHFFFAOYSA-M 0.000 claims description 15
- 239000000758 substrate Substances 0.000 claims description 15
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 claims description 14
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 13
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 12
- 229910052801 chlorine Inorganic materials 0.000 claims description 12
- 239000000460 chlorine Substances 0.000 claims description 12
- 150000003377 silicon compounds Chemical class 0.000 claims description 10
- SRVXDMYFQIODQI-UHFFFAOYSA-K gallium(iii) bromide Chemical compound Br[Ga](Br)Br SRVXDMYFQIODQI-UHFFFAOYSA-K 0.000 claims description 9
- 229910005258 GaBr3 Inorganic materials 0.000 claims description 8
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical group [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052733 gallium Inorganic materials 0.000 claims description 7
- UPWPDUACHOATKO-UHFFFAOYSA-K gallium trichloride Chemical compound Cl[Ga](Cl)Cl UPWPDUACHOATKO-UHFFFAOYSA-K 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- 229910005267 GaCl3 Inorganic materials 0.000 claims description 5
- 229910003676 SiBr4 Inorganic materials 0.000 claims description 5
- AIFMYMZGQVTROK-UHFFFAOYSA-N silicon tetrabromide Chemical compound Br[Si](Br)(Br)Br AIFMYMZGQVTROK-UHFFFAOYSA-N 0.000 claims description 5
- 230000003472 neutralizing effect Effects 0.000 claims description 4
- 229910003910 SiCl4 Inorganic materials 0.000 claims description 3
- FDNAPBUWERUEDA-UHFFFAOYSA-N silicon tetrachloride Chemical compound Cl[Si](Cl)(Cl)Cl FDNAPBUWERUEDA-UHFFFAOYSA-N 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 64
- 230000001681 protective effect Effects 0.000 description 40
- 229920002120 photoresistant polymer Polymers 0.000 description 25
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 9
- 150000001875 compounds Chemical class 0.000 description 9
- 229910052731 fluorine Inorganic materials 0.000 description 9
- 239000011737 fluorine Substances 0.000 description 9
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000007740 vapor deposition Methods 0.000 description 6
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 5
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 5
- 229910052794 bromium Inorganic materials 0.000 description 5
- 230000006837 decompression Effects 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 229910002601 GaN Inorganic materials 0.000 description 4
- 229910052581 Si3N4 Inorganic materials 0.000 description 4
- 229910003902 SiCl 4 Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 4
- 238000000206 photolithography Methods 0.000 description 4
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 4
- 125000004429 atom Chemical group 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000006911 nucleation Effects 0.000 description 3
- 238000010899 nucleation Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 229910003691 SiBr Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010894 electron beam technology Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 238000001020 plasma etching Methods 0.000 description 2
- 238000000623 plasma-assisted chemical vapour deposition Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 229910002704 AlGaN Inorganic materials 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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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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Description
最初に本開示の実施態様を列記して説明する。以下の説明では、同一又は対応する要素には同一の符号を付し、それらについて同じ説明は繰り返さない。
本実施形態は、窒化物半導体を主構成材料とするGaN-HEMTを含む半導体装置の製造方法に関する。図1~図7は、実施形態に係る半導体装置の製造方法を示す断面図である。
10:基板
12:核形成層
14:電子走行層
16:電子供給層
18:キャップ層
18A:上面
20:積層構造
22:ソース電極
23:金属
24:ドレイン電極
26:保護膜
26A:上面
26X:開口
28:ゲート電極
30:絶縁膜
30X:開口
50:フォトレジスト
50X:開口
51:フォトレジスト
51X:開口
52:フォトレジスト
52X:開口
61:シリコン化合物
62:ガリウム化合物
100:エッチング装置
101:ウェハ
110:処理容器
111:プラズマ生成室
112:処理室
113:載置台
114:支持体
121:第1側壁
122:第2側壁
123:底部
124:蓋部
131:電極板
141:孔
142:排気管
143:圧力調整器
144:減圧ポンプ
151:管
152:流量制御器
153:ガスソース
161:コイル
170:遮蔽部材
171:開口
181:高周波電源
182:バイアス電源
183:直流電源
201:エッチャント
202:紫外線
203:矢印
Claims (11)
- 基板と、前記基板の上のガリウムを含む第1窒化物層と、前記第1窒化物層の上のシリコンを含む第2窒化物層とを含む半導体装置の製造方法であって、
塩素原子又は臭素原子を含むガスのエッチャントを発生させる工程と、
前記エッチャントにより前記第1窒化物層に対して前記第2窒化物層を選択的に除去する工程と、
を有し、
前記エッチャントを発生させる工程において、前記エッチャントは前記ガスのプラズマ化により発生され、
前記第2窒化物層を選択的に除去する工程において、前記プラズマ化の際に発生する紫外線が前記第2窒化物層と前記第1窒化物層とへ照射されることが妨げられ、
前記第2窒化物層を選択的に除去する工程は、シリコン原子と前記ガスに含まれる塩素原子又は臭素原子とを含むシリコン化合物の第1飽和蒸気圧より低く、ガリウム原子と前記ガスに含まれる塩素原子又は臭素原子とを含むガリウム化合物の第2飽和蒸気圧より高い第1圧力の第1雰囲気下で前記第2窒化物層をエッチングする工程を有する半導体装置の製造方法。 - 前記ガスが塩素原子を含む時、
前記ガリウム化合物はGaCl3である請求項1に記載の半導体装置の製造方法。 - 前記ガスが臭素原子を含む時、
前記ガリウム化合物はGaBr3である請求項1に記載の半導体装置の製造方法。 - 前記第2窒化物層を選択的に除去する工程において、前記第1圧力を0.1Pa以上10Pa以下とする請求項1から請求項3のいずれか1項に記載の半導体装置の製造方法。
- 前記エッチャントを発生させる工程は、
前記ガスのプラズマ化により帯電した粒子を発生させる工程と、
前記粒子を電気的に中性化する工程と、
を有する請求項1から請求項4のいずれか1項に記載の半導体装置の製造方法。 - 前記エッチャントを発生させる工程は、フィルタにより前記電気的に中性化された粒子の移動方向を制御する工程を有する請求項5に記載の半導体装置の製造方法。
- 前記第2窒化物層を選択的に除去する工程において、前記第2窒化物層のエッチングに続けて前記第1窒化物層の前記第2窒化物層側の面に前記ガリウム化合物が生成され、
前記第2窒化物層を選択的に除去する工程は、前記第2飽和蒸気圧より低い第2圧力の第2雰囲気下で前記ガリウム化合物を除去する工程を有する請求項1から請求項6のいずれか1項に記載の半導体装置の製造方法。 - 前記第2窒化物層を選択的に除去する工程は、前記第2窒化物層に前記第1窒化物層が露出する開口を形成する工程を有する請求項1から請求項7のいずれか1項に記載の半導体装置の製造方法。
- 前記開口内に前記第1窒化物層に接触する電極を形成する工程を有する請求項8に記載の半導体装置の製造方法。
- 前記第1窒化物層の厚さは、前記第2窒化物層を選択的に除去する工程より前において100nm以下である請求項1から請求項9のいずれか1項に記載の半導体装置の製造方法。
- 基板の上に、ガリウムを含む第1窒化物層を形成する工程と、
前記第1窒化物層の上に、シリコンを含む第2窒化物層を形成する工程と、
塩素原子又は臭素原子を含むガスのエッチャントを発生させる工程と、
前記エッチャントにより前記第1窒化物層に対して前記第2窒化物層を選択的に除去して、前記第2窒化物層に前記第1窒化物層が露出する開口を形成する工程と、
前記開口内に前記第1窒化物層に接触する電極を形成する工程と、
を有し、
前記エッチャントを発生させる工程は、
前記ガスのプラズマ化により帯電した粒子を発生させる工程と、
前記粒子を電気的に中性化する工程と、
フィルタにより前記電気的に中性化された粒子の移動方向を制御する工程と、
を有し、
前記第2窒化物層を選択的に除去する工程において、前記プラズマ化の際に発生する紫外線が前記第2窒化物層と前記第1窒化物層とへ照射されることが前記フィルタにより妨げられ、
前記第2窒化物層を選択的に除去する工程は、
シリコン原子と前記ガスに含まれる塩素原子又は臭素原子とを含むSiCl4又はSiBr4の第1飽和蒸気圧より低く、ガリウム原子と前記ガスに含まれる塩素原子又は臭素原子とを含むGaCl3又はGaBr3の第2飽和蒸気圧より高い第1圧力の第1雰囲気下で前記第2窒化物層をエッチングする工程と、
前記第2窒化物層のエッチングに続けて前記第1窒化物層の前記第2窒化物層側の面に前記GaCl3又はGaBr3が生成され、前記第2飽和蒸気圧より低い第2圧力の第2雰囲気下で前記GaCl3又はGaBr3を除去する工程と、
を有する半導体装置の製造方法。
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JP2005317684A (ja) | 2004-04-27 | 2005-11-10 | Eudyna Devices Inc | ドライエッチング方法および半導体装置 |
JP2013131651A (ja) | 2011-12-21 | 2013-07-04 | Fujitsu Semiconductor Ltd | 半導体装置の製造方法 |
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