JP7085608B2 - 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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- JP7085608B2 JP7085608B2 JP2020206510A JP2020206510A JP7085608B2 JP 7085608 B2 JP7085608 B2 JP 7085608B2 JP 2020206510 A JP2020206510 A JP 2020206510A JP 2020206510 A JP2020206510 A JP 2020206510A JP 7085608 B2 JP7085608 B2 JP 7085608B2
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- 239000004065 semiconductor Substances 0.000 title claims description 70
- 238000004519 manufacturing process Methods 0.000 title claims description 17
- 238000005530 etching Methods 0.000 claims description 95
- 239000007789 gas Substances 0.000 claims description 66
- 239000000463 material Substances 0.000 claims description 57
- 238000000034 method Methods 0.000 claims description 50
- 150000001875 compounds Chemical class 0.000 claims description 34
- 238000001039 wet etching Methods 0.000 claims description 23
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 8
- 239000001307 helium Substances 0.000 claims description 6
- 229910052734 helium Inorganic materials 0.000 claims description 6
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 6
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 claims 2
- 239000010410 layer Substances 0.000 description 64
- 150000002500 ions Chemical class 0.000 description 38
- 238000001020 plasma etching Methods 0.000 description 35
- 239000000758 substrate Substances 0.000 description 32
- 239000007788 liquid Substances 0.000 description 27
- 239000001257 hydrogen Substances 0.000 description 18
- 229910052739 hydrogen Inorganic materials 0.000 description 18
- 150000002431 hydrogen Chemical class 0.000 description 11
- 239000000460 chlorine Substances 0.000 description 8
- 230000035515 penetration Effects 0.000 description 8
- 238000009616 inductively coupled plasma Methods 0.000 description 7
- 238000004364 calculation method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 4
- 229910052801 chlorine Inorganic materials 0.000 description 4
- 230000005596 ionic collisions Effects 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000003672 processing method Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000011819 refractory material Substances 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 2
- 229910052738 indium Inorganic materials 0.000 description 2
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 2
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 2
- 229920002120 photoresistant polymer Polymers 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
- 229910000530 Gallium indium arsenide Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910000577 Silicon-germanium Inorganic materials 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000000295 emission spectrum Methods 0.000 description 1
- -1 hydrogen ions Chemical class 0.000 description 1
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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Description
料のパターンを形成する方法において、プラズマを用いて半導体材料をエッチングする工程と、軽元素により生成されたプラズマを用いてエッチングされた半導体材料の側壁にダメージ層を形成する工程と、ダメージ層を除去する工程とにより半導体材料を加工するようにした。
さらに、半導体材料が化合物半導体材料の場合、本発明は、異方性加工ステップにおいて、塩素(Cl2)と水素(H2)を混合したガス、または塩素(Cl2)と水素(H2)とメタン(CH4)を混合したガスを用いる。
まず、図1に示したプラズマエッチング装置100の内部に試料107を搬入して試料台108上に載置する(S311)。この時の試料107のマスクパターンが形成されている部分の断面は、図7(a)に示すような形状をしている。
ガス供給部114からエッチング処理室104の内部にダメージ層形成用のガスを供給する(S321)。
ε0:真空誘電率 np:プラズマ密度 T:ガス温度、 e:電気素量
V:試料に係る電圧 d:原子半径 Te:電子温度 kB:ボルツマン定数
p:エッチング処理室内の圧力
である。
ε0=8.85×10-12(F/m) np=5.0×1016(/m3) T=363(K)
e=1.60×10-19(C) V=400(V) Te=3.0(eV)
kB=1.38×10-23(m2・kg/s2・K)
として、平均自由行程Lとシース長disを求めてみる。
さらに本実施例は、マイクロ波ECRプラズマエッチング装置を一実施例として説明したが、容量結合型プラズマや誘導結合型プラズマ等の他のプラズマ生成方式におけるプラズマ処理装置においても本実施例と同様の効果が得られる。
また、本実施例では、化合物半導体材料の下方に基板が配置され、化合物半導体材料の上方にマスクパターンが形成されている例で説明したが、本発明は、化合物半導体材料の上方が必ずしもマスクパターンである必要はなく、また、化合物半導体材料の下方が必ずしも基板である必要はない。
まず、図10に示したプラズマ処理装置1000のラジカル照射室1120の内部に試料107を搬入して基板試料台1121上に載置する(S531)。この時の試料107のマスクパターンが形成されている部分の断面は、図7(c)に示すような、ダメージ層423が形成された形状をしている。
例えば、フロントエンド工程において用いられる、Si、SiGe、Ge、SiN、SiO2等または、バックエンド工程の層間膜として用いられる、SiOC、SiON、SiOCN等のLow-k材料にも本発明は適用可能である。
101 マイクロ波電源
103 導波管
104 エッチング処理室
105 誘電体窓
106 電磁コイル
107 試料
108 試料台
110 高周波電源
112 マッチング回路
114 ガス供給部
115 ガス流量制御部
116 真空排気部
120 制御部
200 ウェットエッチング装置
201 処理液槽
202 供給パイプ
203 排出パイプ
204 供給液流量調整部
205 排出液流量調整部
206 エッチング処理液
210 制御部
220 基板積載具
222 基板積載具駆動部
1000 プラズマ処理装置
1100 プラズマ処理室
1110 プラズマ発生室
1120 ラジカル照射室
1121 基板試料台
1122 絶縁ブロック
1140 ガス供給ノズル
1150 真空排気ポンプ
1160 高周波電源
1170 制御部
Claims (6)
- プラズマを用いて半導体材料をエッチングする工程と、
軽元素により生成されたプラズマを用いて前記エッチングされた前記半導体材料の側壁にダメージ層を形成する工程と、
前記ダメージ層を除去する工程とを有することを特徴とする半導体装置の製造方法。 - 請求項1に記載の半導体装置の製造方法において、
前記ダメージ層を除去する工程は、ウェットエッチングにより行われることを特徴とする半導体装置の製造方法。 - 請求項1に記載の半導体装置の製造方法において、
前記半導体材料は、化合物半導体材料であることを特徴とする半導体装置の製造方法。 - 請求項3に記載の半導体装置の製造方法において、
前記エッチングする工程は、塩素ガスと水素ガスの混合ガス、または塩素ガスと水素ガスとメタンガスの混合ガスを用いて行われることを特徴とする半導体装置の製造方法。 - 請求項1に記載の半導体装置の製造方法において、
前記軽元素は、水素ガスまたはヘリウムガスであることを特徴とする半導体装置の製造方法。 - 請求項1に記載の半導体装置の製造方法において、
前記ダメージ層を除去する工程は、プラズマを用いて行われることを特徴とする半導体装置の製造方法。
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