JP6719416B2 - 凹部の埋め込み方法および処理装置 - Google Patents
凹部の埋め込み方法および処理装置 Download PDFInfo
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- JP6719416B2 JP6719416B2 JP2017066858A JP2017066858A JP6719416B2 JP 6719416 B2 JP6719416 B2 JP 6719416B2 JP 2017066858 A JP2017066858 A JP 2017066858A JP 2017066858 A JP2017066858 A JP 2017066858A JP 6719416 B2 JP6719416 B2 JP 6719416B2
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- gas
- recess
- film
- germanium
- etching
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- 238000000034 method Methods 0.000 title claims description 53
- 229910052732 germanium Inorganic materials 0.000 claims description 134
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 134
- 238000005530 etching Methods 0.000 claims description 87
- 230000007246 mechanism Effects 0.000 claims description 47
- 239000000758 substrate Substances 0.000 claims description 21
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 18
- 229910052710 silicon Inorganic materials 0.000 claims description 18
- 239000010703 silicon Substances 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000003860 storage Methods 0.000 claims description 10
- 230000005284 excitation Effects 0.000 claims description 8
- 229910000078 germane Inorganic materials 0.000 claims description 6
- GMEFXBFKMIZRMO-UHFFFAOYSA-N aminogermanium Chemical compound [Ge]N GMEFXBFKMIZRMO-UHFFFAOYSA-N 0.000 claims description 4
- 230000005281 excited state Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 196
- 235000012431 wafers Nutrition 0.000 description 53
- 229910021417 amorphous silicon Inorganic materials 0.000 description 18
- 239000002994 raw material Substances 0.000 description 17
- 239000011261 inert gas Substances 0.000 description 15
- 230000008569 process Effects 0.000 description 15
- 239000006185 dispersion Substances 0.000 description 12
- 239000004065 semiconductor Substances 0.000 description 12
- 229910004298 SiO 2 Inorganic materials 0.000 description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- 230000015572 biosynthetic process Effects 0.000 description 9
- 239000010453 quartz Substances 0.000 description 8
- 150000001875 compounds Chemical class 0.000 description 7
- 239000010410 layer Substances 0.000 description 7
- 238000005192 partition Methods 0.000 description 7
- 238000005229 chemical vapour deposition Methods 0.000 description 6
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 5
- QUZPNFFHZPRKJD-UHFFFAOYSA-N germane Chemical compound [GeH4] QUZPNFFHZPRKJD-UHFFFAOYSA-N 0.000 description 4
- 229910052986 germanium hydride Inorganic materials 0.000 description 4
- FZHAPNGMFPVSLP-UHFFFAOYSA-N silanamine Chemical compound [SiH3]N FZHAPNGMFPVSLP-UHFFFAOYSA-N 0.000 description 4
- 229910000077 silane Inorganic materials 0.000 description 4
- 239000011800 void material Substances 0.000 description 4
- 239000002826 coolant Substances 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- -1 silane compound Chemical class 0.000 description 3
- CGRVKSPUKAFTBN-UHFFFAOYSA-N N-silylbutan-1-amine Chemical compound CCCCN[SiH3] CGRVKSPUKAFTBN-UHFFFAOYSA-N 0.000 description 2
- GWFYHOXZOBEFTG-UHFFFAOYSA-N [GeH3]N Chemical class [GeH3]N GWFYHOXZOBEFTG-UHFFFAOYSA-N 0.000 description 2
- AWFPGKLDLMAPMK-UHFFFAOYSA-N dimethylaminosilicon Chemical compound CN(C)[Si] AWFPGKLDLMAPMK-UHFFFAOYSA-N 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- PZPGRFITIJYNEJ-UHFFFAOYSA-N disilane Chemical compound [SiH3][SiH3] PZPGRFITIJYNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000003028 elevating effect Effects 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 239000000919 ceramic 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
- VXGHASBVNMHGDI-UHFFFAOYSA-N digermane Chemical compound [Ge][Ge] VXGHASBVNMHGDI-UHFFFAOYSA-N 0.000 description 1
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000011553 magnetic fluid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 150000004756 silanes Chemical class 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
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Description
最初に、本発明に係る凹部の埋め込み方法の一実施形態について、図1のフロー図および図2の工程断面図に基づいて説明する。
図3は本発明の一実施形態に係る凹部の埋め込み方法の実施に用いることができる処理装置の一例を示す縦断面図、図4は図3に示す処理装置の水平断面図である。
次に、以上のように構成される処理装置により上述したような凹部の埋め込み方法を実施する際の処理動作について説明する。以下の処理動作は制御部50における記憶部の記憶媒体に記憶された処理レシピに基づいて実行される。
・ウエハ枚数:150枚
・アモルファスシリコン膜成膜
温度:400℃以下
圧力:2.0Torr(266.6Pa)
SiH4ガス流量:1000sccm
・Ge膜埋め込み
温度:300℃
圧力:0.1〜1Torr(13.3〜133.3Pa)
GeH4ガス流量:700sccm
・エッチング
温度:300℃
圧力:0.1〜0.5Torr(13.3〜66.5Pa)
RFパワー:100〜500W
NH3ガス流量:500〜50000sccm
H2ガス流量:200〜20000sccm
次に実験例1について説明する。
図5および図6は、実験例1におけるサンプルウエハの断面を示すSEM写真である。図5は、絶縁膜に形成された凹部をGe膜で完全に埋め込んだ(Full Filling)サンプルウエハの断面を示すSEM写真である。図6は、絶縁膜に形成された凹部をGe膜で半分程度埋め込んだ(Half Filling)サンプルウエハの断面を示すSEM写真である。
次に実験例2について説明する。
図7は、実験例1におけるエッチング処理前(Initial)のブランケットサンプルの断面を示すSEM写真である。実験例2では、図7に示すような、Si基体上に、熱酸化SiO2膜、およびゲルマニウム膜またはシリコン膜が同順に形成されたブランケットサンプル(以下、サンプルと記載)を準備し(サンプルA,B)、これらのサンプルに対し図3および図4の処理装置を用いてゲルマニウム膜のエッチング処理を行った。
エッチング条件としては、以下の通りである。
温度:300℃
圧力:0.2Torr(26.6Pa)
NH3ガス流量:5slm(5000sccm)
H2ガス流量:2slm(2000sccm)
RFパワー:500W
処理時間:30min
留意点として、エッチング処理の際のガス流量は、NH3ガスは、5slm(5000sccm)であるが、H2ガスの場合は、2slm(2000sccm)である。
図8は、実験例1におけるNH3ガスによるエッチング処理後(Post Treatment)のサンプルA、Bの断面を示すSEM写真である。具体的には、図8(a)がサンプルA、図8(b)がサンプルBのエッチング処理後の断面を示すSEM写真である。
図9は、実験例1におけるH2ガスによるエッチング処理後(Post Treatment)のサンプルA、Bの断面を示すSEM写真である。具体的には、図9(a)がサンプルA、図9(b)がサンプルBのエッチング処理後の断面を示すSEM写真である。
以上、本発明の実施形態について説明したが、この発明は、上記の実施形態に限定されることはなく、その趣旨を逸脱しない範囲で種々変形可能である。
5;ウエハボート
14;Si原料ガス供給機構
15;エッチングガス供給機構
16;Ge原料ガス供給機構
30;プラズマ生成機構
33;プラズマ電極
35;高周波電源
41;排気装置
42;加熱機構
100;成膜装置
200;半導体基体
201;絶縁膜
202;凹部
203;アモルファスシリコン膜
204;第1ゲルマニウム膜
205;第2ゲルマニウム膜
W;半導体ウエハ(被処理基板)
Claims (9)
- 凹部が形成された絶縁膜を表面に有する被処理基板に対し、前記凹部にゲルマニウム膜を埋め込む凹部の埋め込み方法であって、
被処理基板にゲルマニウム原料ガスを供給して前記凹部を埋め込むように第1ゲルマニウム膜を成膜する工程と、
次いで、励起されたH2ガスまたはNH3ガスを含むエッチングガスにより、前記第1ゲルマニウム膜をエッチングする工程と、
次いで、ゲルマニウム原料ガスを供給して前記凹部を埋め込むように、前記第1ゲルマニウム膜上に第2ゲルマニウム膜を成膜する工程と
を有することを特徴とする凹部の埋め込み方法。 - 前記エッチングガスは、プラズマ化された状態で供給されることを特徴とする請求項1に記載の凹部の埋め込み方法。
- 前記第1ゲルマニウム膜を成膜する工程に先立って、前記絶縁膜の表面にシリコン膜を成膜する工程をさらに有することを特徴とする請求項1または請求項2に記載の凹部の埋め込み方法。
- 前記ゲルマニウム原料ガスは、ゲルマン系ガスまたはアミノゲルマン系ガスであることを特徴とする請求項1から請求項3のいずれか1項に記載の凹部の埋め込み方法。
- 前記第1ゲルマニウム膜をエッチングする工程は、前記被処理基板の温度を200〜400℃の範囲内にして行われることを特徴とする請求項1から請求項4のいずれか1項に記載の凹部の埋め込み方法。
- 前記第1ゲルマニウム膜をエッチングする工程は、圧力が6.7〜133Paの範囲内にして行われることを特徴とする請求項1から請求項5のいずれか1項に記載の凹部の埋め込み方法。
- 凹部が形成された絶縁膜を表面に有する被処理基板に対し、前記凹部にゲルマニウム膜を埋め込む処理装置であって、
前記被処理基板を収容する処理容器と、
前記処理容器内に所定のガスを供給するガス供給部と、
前記所定のガスを励起する励起機構と、
前記処理容器内を加熱する加熱機構と、
前記処理容器内を排気して減圧状態とする排気機構と、
前記ガス供給部、前記励起機構、前記加熱機構、および前記排気機構を制御する制御部と
を具備し、
前記制御部は、
前記排気機構により前記処理容器内を所定の減圧状態に制御し、前記加熱機構により前記処理容器内を所定温度に制御し、
前記ガス供給部から前記処理容器内にゲルマニウム原料ガスを供給させて、前記凹部を埋め込むように第1ゲルマニウム膜を成膜させ、
次いで、前記ガス供給部からH2ガスまたはNH3ガスを含むエッチングガスを供給させ、前記エッチングガスを前記励起機構で励起させ、
次いで、前記励起された状態のエッチングガスにより、前記処理容器内で前記第1ゲルマニウム膜をエッチングさせ、
次いで、前記ガス供給部から前記処理容器内にゲルマニウム原料ガスを供給させて、前記凹部を埋め込むように、前記第1ゲルマニウム膜上に第2ゲルマニウム膜を成膜させることを特徴とする処理装置。 - 前記励起機構は、プラズマ生成機構であることを特徴とする請求項7に記載の処理装置。
- コンピュータ上で動作し、処理装置を制御するためのプログラムが記憶された記憶媒体であって、前記プログラムは、実行時に、請求項1から請求項6のいずれかの凹部の埋め込み方法が行われるように、コンピュータに前記処理装置を制御させることを特徴とする記憶媒体。
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