JP6671262B2 - 窒化膜の形成方法および形成装置 - Google Patents
窒化膜の形成方法および形成装置 Download PDFInfo
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- JP6671262B2 JP6671262B2 JP2016150985A JP2016150985A JP6671262B2 JP 6671262 B2 JP6671262 B2 JP 6671262B2 JP 2016150985 A JP2016150985 A JP 2016150985A JP 2016150985 A JP2016150985 A JP 2016150985A JP 6671262 B2 JP6671262 B2 JP 6671262B2
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- gas
- film
- nitride film
- forming
- etching
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- 150000004767 nitrides Chemical class 0.000 title claims description 98
- 238000000034 method Methods 0.000 title claims description 66
- 239000007789 gas Substances 0.000 claims description 404
- 238000005530 etching Methods 0.000 claims description 98
- 238000005121 nitriding Methods 0.000 claims description 66
- 239000000758 substrate Substances 0.000 claims description 45
- 239000000460 chlorine Substances 0.000 claims description 43
- 230000007246 mechanism Effects 0.000 claims description 41
- 230000015572 biosynthetic process Effects 0.000 claims description 40
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 33
- 229910052801 chlorine Inorganic materials 0.000 claims description 33
- 238000011534 incubation Methods 0.000 claims description 30
- 239000000463 material Substances 0.000 claims description 23
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 13
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 11
- 150000002430 hydrocarbons Chemical class 0.000 claims description 10
- 238000003860 storage Methods 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 claims description 8
- 230000008021 deposition Effects 0.000 claims description 7
- 239000004215 Carbon black (E152) Substances 0.000 claims description 6
- 229930195733 hydrocarbon Natural products 0.000 claims description 6
- 238000001179 sorption measurement Methods 0.000 claims description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 5
- 229910052731 fluorine Inorganic materials 0.000 claims description 5
- 230000001590 oxidative effect Effects 0.000 claims description 5
- VXEGSRKPIUDPQT-UHFFFAOYSA-N 4-[4-(4-methoxyphenyl)piperazin-1-yl]aniline Chemical compound C1=CC(OC)=CC=C1N1CCN(C=2C=CC(N)=CC=2)CC1 VXEGSRKPIUDPQT-UHFFFAOYSA-N 0.000 claims description 4
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 4
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 4
- KOPOQZFJUQMUML-UHFFFAOYSA-N chlorosilane Chemical compound Cl[SiH3] KOPOQZFJUQMUML-UHFFFAOYSA-N 0.000 claims description 4
- MROCJMGDEKINLD-UHFFFAOYSA-N dichlorosilane Chemical compound Cl[SiH2]Cl MROCJMGDEKINLD-UHFFFAOYSA-N 0.000 claims description 4
- PZPGRFITIJYNEJ-UHFFFAOYSA-N disilane Chemical compound [SiH3][SiH3] PZPGRFITIJYNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000011737 fluorine Substances 0.000 claims description 4
- 239000005049 silicon tetrachloride Substances 0.000 claims description 4
- LXEXBJXDGVGRAR-UHFFFAOYSA-N trichloro(trichlorosilyl)silane Chemical compound Cl[Si](Cl)(Cl)[Si](Cl)(Cl)Cl LXEXBJXDGVGRAR-UHFFFAOYSA-N 0.000 claims description 4
- ZDHXKXAHOVTTAH-UHFFFAOYSA-N trichlorosilane Chemical compound Cl[SiH](Cl)Cl ZDHXKXAHOVTTAH-UHFFFAOYSA-N 0.000 claims description 4
- 239000005052 trichlorosilane Substances 0.000 claims description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 3
- 150000002429 hydrazines Chemical class 0.000 claims description 3
- 229910000040 hydrogen fluoride Inorganic materials 0.000 claims description 3
- 238000002203 pretreatment Methods 0.000 claims description 3
- -1 silane compound Chemical class 0.000 claims description 3
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 3
- 229910000077 silane Inorganic materials 0.000 claims 2
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- 229910052799 carbon Inorganic materials 0.000 description 4
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
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- HDZGCSFEDULWCS-UHFFFAOYSA-N monomethylhydrazine Chemical compound CNN HDZGCSFEDULWCS-UHFFFAOYSA-N 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
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- 229910001220 stainless steel Inorganic materials 0.000 description 2
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- 229910008045 Si-Si Inorganic materials 0.000 description 1
- 229910003902 SiCl 4 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910006411 Si—Si Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- SLLGVCUQYRMELA-UHFFFAOYSA-N chlorosilicon Chemical compound Cl[Si] SLLGVCUQYRMELA-UHFFFAOYSA-N 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
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- 239000002052 molecular layer Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
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- 238000007781 pre-processing Methods 0.000 description 1
- FZHAPNGMFPVSLP-UHFFFAOYSA-N silanamine Chemical class [SiH3]N FZHAPNGMFPVSLP-UHFFFAOYSA-N 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/0226—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process
- H01L21/02263—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase
- H01L21/02271—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition
- H01L21/0228—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition deposition by cyclic CVD, e.g. ALD, ALE, pulsed CVD
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- C23C16/0227—Pretreatment of the material to be coated by cleaning or etching
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- C23C16/301—AIII BV compounds, where A is Al, Ga, In or Tl and B is N, P, As, Sb or Bi
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Description
一般的に、サーマルALDまたはCVDによりSiN膜を形成する際には、被処理基板を処理容器内に収容し、被処理基板を所定温度に加熱した状態で、Si原料ガスとしてDCSガスおよび窒化ガスとしてNH3ガスをシーケンシャルに所定回数繰り返すことにより、または同時に供給することにより、被処理基板の表面に所定膜厚のSiN膜を形成する。
次に、本発明の窒化膜の形成方法について説明する。ここでは、窒化膜としてSiN膜を形成する場合を例にとって説明する。
図3は、窒化膜の形成方法の第1の実施形態を示すフロー図である。
このガス系は、基本的にO2ガスによりSiO2膜を保護し、F2ガスによりSi(SiN)を削る。F2ガスのみでSiNが十分に削れない場合は、HFを添加することでエッチング性能を向上させてもよい。また、SiO2膜の保護を強化するために、CxHy等の炭化水素系化合物(好ましくは構造中にCの二重結合あるいは三重結合を有するもの)を導入してもよい。O2ガスの代わりに他の酸化性ガス、例えば、O3、NO、N2O等を用いることもできる。また、CxHyとしては、C2H2、C2H4、C3H6、C5H8等を用いることができる。
このガス系は、SiO2膜上にカーボンによりデポ相を形成して保護し、FyでSi(SiN)を削り、HxでSiNの窒化部をNHx↑として削る。このガス系の例としては、CF4、CHF3、CH2F2、CHF3等を挙げることができる。なお、このガス系には、CH3FやCH2F2等の可燃性ガスも存在するが、可燃性ガスは通常の供給系では供給が困難である。
このガス系は、上記(2)と同様に、SiO2膜上にカーボンによりデポ相を形成して保護し、FyでSi(SiN)を削り、炭化水素中のHでSiNの窒化部をNHx↑として削る。このガス系の例としては、NF3、NF2CH3、NF(CH3)2、NF2(CH2CH3),NH(CH2CH3)2、NFCH(CH3)2等を挙げることができる。
図7は、本実施形態に係る窒化膜の形成方法の第2の実施形態を示すフロー図である。
次に、上記第1および第2の実施形態における選択的な膜形成の適用例について説明する。
近時、デバイスの微細化にともない、例えばエッチングのプロセスマージンが益々小さくなっており、エッチング誤差が生じやすくなっている。例えば、図10(a)のような、SiO2膜211とSiN膜212の積層構造210をエッチングにより形成する場合、図10(b)のように、SiN膜212が予定よりも余分にエッチングされることがある。そのような場合に、図10(c)に示すように、本実施形態の選択的なSiN膜の形成方法により、SiN膜212に選択的SiN膜213を成膜することにより、極めて簡便に修復することができる。
次に、本発明の窒化膜の形成方法を実施するための成膜装置の例について説明する。
本例では成膜装置として縦型バッチ式成膜装置の例を示す。
図13は本発明に係る窒化膜の形成方法を実施するための成膜装置の第1の例を示す縦断面図、図14は図13に示す成膜装置の水平断面図である。
DCSガス流量:500〜2000sccm
NH3ガス流量:1000〜10000sccm
エッチングガス流量:1〜10000sccm
N2ガス(パージガス)流量:50〜5000sccm
1回当たりのDCSガス供給時間:3〜60sec
1回当たりのNH3ガス供給時間:5〜60sec
1回当たりのエッチングガス供給時間:10〜600sec
1回当たりのパージ時間:1〜30sec
本例では成膜装置として水平バッチ式成膜装置の例を示す。
図15は本発明に係る窒化膜の形成方法を実施するための成膜装置の第2の例を概略的に示す水平断面図である。
処理容器61内の搬入出口63に対応する部分は搬入出部65となっており、この搬入出部65において、ターンテーブル62上へのウエハWの搬入およびターンテーブル62上のウエハWの搬出が行われる。
DCSガス流量:500〜2000sccm
NH3ガス流量:1000〜10000sccm
エッチングガス流量:10〜10000sccm
N2ガス(不活性ガス)流量:50〜10000sccm
本例では成膜装置として枚葉式成膜装置の例を示す。
図16は本発明に係る窒化膜の形成方法を実施するための成膜装置の第3の例を概略的に示す水平断面図である。
DCSガス流量:10〜2000sccm
NH3ガス流量:1000〜5000sccm
エッチングガス流量:1〜10000sccm
N2ガス(パージガス)流量:50〜5000sccm
1回当たりのDCSガス供給時間:0.1〜60sec
1回当たりのNH3ガス供給時間:0.1〜60sec
1回当たりのエッチングガス供給時間:10〜600sec
1回当たりのパージ時間:0.1〜60sec
以上、本発明の実施形態について説明したが、本発明は、上記の実施形態に限定されず、その思想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;窒化ガス供給機構
15;Si原料ガス供給機構
16;エッチングガス供給機構
26;パージガス供給機構
41;排気装置
42;加熱装置
62;ターンテーブル
65;搬入出部
71;第1処理エリア(Si原料ガス供給エリア)
72;第2処理エリア(エッチングガス供給エリア)
73;第3処理エリア(窒化エリア)
100,101,102;成膜装置
112;基板載置台
113;加熱ヒータ
114;Si原料ガス配管
115;エッチングガス配管
116;窒化ガス配管
117;パージガス配管
118;排気管
201;半導体基体
202;第1の下地膜
203;第2の下地膜
204;Cl2ガス
205;SiN膜
211;SiO2膜
212;SiN膜
213;選択的SiN膜
221;ゲート電極
222;スペーサ
223;熱酸化膜
224;選択的SiN膜
W;半導体ウエハ
Claims (24)
- 窒化膜に対し相対的にインキュベーションタイムが長い材料からなる第1の下地膜と、相対的にインキュベーションタイムが短い材料からなる第2の下地膜とを有する被処理基板を準備する第1工程と、
前記被処理基板を所定温度に加熱しつつ、前記被処理基板に対し、原料ガスおよび窒化ガスを用いて、ALDまたはCVDにより窒化膜を成膜する第2工程と、
エッチングガスを供給して、前記第1の下地膜上の窒化物をエッチング除去し、前記第1の下地膜の膜面を露出させる第3工程と、
前記第1工程の後、前記第2工程に先立って、前記被処理基板を所定温度に加熱しつつ塩素含有ガスを供給し、前記第1の下地膜と前記第2の下地膜の表面に塩素含有ガスを吸着させる前処理を行う第4工程と
を有し、
前記第4工程、前記第2工程、および前記第3工程を所定回繰り返して、前記第2の下地膜上に選択的に窒化膜を形成することを特徴とする窒化膜の形成方法。 - 前記窒化膜を成膜する工程をALDにより行う場合に、最初に成膜原料を供給することを特徴とする請求項1に記載の窒化膜の形成方法。
- 前記エッチングガスは、前記窒化膜をエッチングしやすく、前記第1の下地膜をエッチングし難いガスであることを特徴とする請求項1または請求項2に記載の窒化膜の形成方法。
- 前記第4工程に用いられる前記塩素含有ガスは、Cl2ガス、HClガス、BCl3ガスから選択された少なくとも1種の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項に記載の窒化膜の形成方法。
- 前記第1の下地膜がシリコン酸化膜であり、前記第2の下地膜がシリコン窒化膜であり、前記第1の下地膜および前記第2の下地膜の上に形成する窒化膜はシリコン窒化膜であ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項に記載の窒化膜の形成方法。
- 前記シリコン窒化膜を成膜する際に用いる前記原料ガスは、ジクロロシラン、モノクロロシラン、トリクロロシラン、シリコンテトラクロライド、ヘキサクロロジシラン、モノシラン、ジシラン、有機シラン系化合物のいずれかであることを特徴とする請求項5に記載の窒化膜の形成方法。
- 前記エッチングガスは、フッ素ガスおよび酸化性ガスを含むことを特徴とする請求項5または請求項6に記載の窒化膜の形成方法。
- 前記エッチングガスは、さらにフッ化水素ガスおよび/または炭化水素系化合物ガスを含むことを特徴とする請求項7に記載の窒化膜の形成方法。
- 前記エッチングガスは、CHxFy(ただし、xは0または1以上の整数、yは1以上の整数である。)で表されるガスであることを特徴とする請求項5または請求項6に記載の窒化膜の形成方法。
- 前記エッチングガスは、NFxRy(ただし、Rは炭化水素であり、xは1以上の整数、yは0または1以上の整数である。)で表されるガスであることを特徴とする請求項5または請求項6に記載の窒化膜の形成方法。
- 前記窒化膜を成膜する工程は、ALDの場合に400〜650℃、CVDの場合に600〜800℃で行うことを特徴とする請求項5から請求項10のいずれか1項に記載の窒化膜の形成方法。
- 前記第2工程と、前記第3工程は、同一装置内で連続的に実施することを特徴とする請求項1から請求項11のいずれか1項に記載の窒化膜の形成方法。
- 前記第2工程と、前記第3工程は、同じ温度で行われることを特徴とする請求項12に記載の窒化膜の形成方法。
- 前記窒化膜の成膜に用いられる前記窒化ガスは、アンモニアガス、またはヒドラジンガス、またはヒドラジンの誘導体のガスであることを特徴とする請求項1から請求項13のいずれか1項に記載の窒化膜の形成方法。
- 窒化膜に対し相対的にインキュベーションタイムが長い材料からなる第1の下地膜と、相対的にインキュベーションタイムが短い材料からなる第2の下地膜とを有する被処理基板において、前記第2の下地膜上に選択的に窒化膜を形成する窒化膜の形成装置であって、
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、原料ガス、窒化ガス、エッチングガスを供給するガス供給機構と、
前記処理容器内に収容された複数の被処理基板を加熱する加熱装置と、
前記処理容器内を排気する排気装置と、
前記処理容器内に前記被処理基板を配置させ、前記被処理基板を所定温度に加熱させつつ塩素含有ガスを供給させ、前記第1の下地膜と前記第2の下地膜の表面に塩素含有ガスを吸着させる前処理を行わせ、次いで、原料ガスおよび窒化ガスを前記処理容器内に供給させ、前記被処理基板上に、ALDまたはCVDにより前記窒化膜を成膜させ、次いで、エッチングガスを供給して、前記第1の下地膜上の窒化物をエッチング除去して、前記第1の下地膜の膜面を露出させ、前記前処理と、前記窒化膜の成膜と、前記第1の下地膜上の窒化物のエッチング除去とが所定回数繰り返されるように制御する制御部と
を有することを特徴とする窒化膜の形成装置。 - 前記前処理に用いられる前記塩素含有ガスは、Cl 2 ガス、HClガス、BCl 3 ガスから選択された少なくとも1種のガスであることを特徴とする請求項15に記載の窒化膜の形成装置。
- 前記第1の下地膜がシリコン酸化膜であり、前記第2の下地膜がシリコン窒化膜であり、前記第1の下地膜および前記第2の下地膜の上に形成する窒化膜はシリコン窒化膜であることを特徴とする請求項15または請求項16に記載の窒化膜の形成装置。
- 前記シリコン窒化膜を成膜する際に用いる前記原料ガスは、ジクロロシラン、モノクロロシラン、トリクロロシラン、シリコンテトラクロライド、ヘキサクロロジシラン、モノシラン、ジシラン、有機シラン系化合物のいずれかであることを特徴とする請求項17に記載の窒化膜の形成装置。
- 前記エッチングガスは、フッ素ガスおよび酸化性ガスを含むことを特徴とする請求項17または請求項18に記載の窒化膜の形成装置。
- 前記エッチングガスは、さらにフッ化水素ガスおよび/または炭化水素系化合物ガスを含むことを特徴とする請求項19に記載の窒化膜の形成方装置。
- 前記エッチングガスは、CHxFy(ただし、xは0または1以上の整数、yは1以上の整数である。)で表されるガスであることを特徴とする請求項17または請求項18に記載の窒化膜の形成装置。
- 前記エッチングガスは、NFxRy(ただし、Rは炭化水素であり、xは1以上の整数、yは0または1以上の整数である。)で表されるガスであることを特徴とする請求項17または請求項18に記載の窒化膜の形成装置。
- 前記窒化膜の成膜に用いられる前記窒化ガスは、アンモニアガス、またはヒドラジンガス、またはヒドラジンの誘導体のガスであることを特徴とする請求項15から請求項22のいずれか1項に記載の窒化膜の形成装置。
- コンピュータ上で動作し、窒化膜の形成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14のいずれかの窒化膜の形成方法が行われるように、コンピュータに前記窒化膜の形成装置を制御させることを特徴とする記憶媒体。
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Free format text: JAPANESE INTERMEDIATE CODE: R250 |