JP7433132B2 - 成膜方法及び成膜装置 - Google Patents
成膜方法及び成膜装置 Download PDFInfo
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- JP7433132B2 JP7433132B2 JP2020087635A JP2020087635A JP7433132B2 JP 7433132 B2 JP7433132 B2 JP 7433132B2 JP 2020087635 A JP2020087635 A JP 2020087635A JP 2020087635 A JP2020087635 A JP 2020087635A JP 7433132 B2 JP7433132 B2 JP 7433132B2
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- 238000000034 method Methods 0.000 title claims description 58
- 239000007789 gas Substances 0.000 claims description 237
- 238000012545 processing Methods 0.000 claims description 98
- 239000000758 substrate Substances 0.000 claims description 74
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 68
- 229910052750 molybdenum Inorganic materials 0.000 claims description 67
- 239000011733 molybdenum Substances 0.000 claims description 67
- 229910015275 MoF 6 Inorganic materials 0.000 claims description 22
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 22
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 10
- 125000004433 nitrogen atom Chemical group N* 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 7
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- 239000010408 film Substances 0.000 description 199
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 44
- 238000003860 storage Methods 0.000 description 31
- 230000015572 biosynthetic process Effects 0.000 description 17
- 238000012546 transfer Methods 0.000 description 17
- 230000008569 process Effects 0.000 description 15
- 239000012159 carrier gas Substances 0.000 description 11
- 230000032258 transport Effects 0.000 description 11
- 230000007723 transport mechanism Effects 0.000 description 10
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- 229910052814 silicon oxide Inorganic materials 0.000 description 9
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 8
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 8
- 239000001257 hydrogen Substances 0.000 description 8
- 229910052739 hydrogen Inorganic materials 0.000 description 8
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 230000007246 mechanism Effects 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 238000000231 atomic layer deposition Methods 0.000 description 6
- 238000010926 purge Methods 0.000 description 6
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 6
- 229910052721 tungsten Inorganic materials 0.000 description 6
- 239000010937 tungsten Substances 0.000 description 6
- 230000004888 barrier function Effects 0.000 description 5
- 238000011144 upstream manufacturing Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000007781 pre-processing Methods 0.000 description 3
- 238000002203 pretreatment Methods 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003028 elevating effect Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910052782 aluminium 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
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- CNRRZWMERIANGJ-UHFFFAOYSA-N chloro hypochlorite;molybdenum Chemical compound [Mo].ClOCl CNRRZWMERIANGJ-UHFFFAOYSA-N 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 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
- 239000007787 solid Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 description 1
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- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76801—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing
- H01L21/76822—Modification of the material of dielectric layers, e.g. grading, after-treatment to improve the stability of the layers, to increase their density etc.
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Description
まず、一実施形態に係る成膜方法に用いる処理システムについて、図1を用いて説明する。図1は、一実施形態に係る成膜方法に用いる処理システムを示す平面模式図である。
次に、一実施形態に係る成膜方法に用いる処理室111~114の少なくともいずれかを形成する成膜装置10の構成の一例について図2を用いて説明する。図2は、一実施形態に係る成膜方法に用いる成膜装置10の縦断面図である。
次に、上記のように構成された成膜システムを用いて行われる、モリブデン膜の成膜方法について、図3~図5を用いて説明する。図3は、一実施形態に係る成膜方法の各工程の流れを示すフローチャートである。図4は、一実施形態に係る成膜方法の各工程での基板の状態を模式的に示した断面図である。図5は、一実施形態に係るアルミナ層の表面がN終端される状態を模式的に示した図である。図3の処理は、成膜装置10の制御部6が制御する。
成膜装置10がモリブデン膜を成膜するまでの流れについて、図6を用いて説明する。図6は、一実施形態に係るモリブデン膜を成膜する際のガス供給シーケンスを示す図である。
前処理(トリートメント処理)が実行され、窒素原子によりアルミナ層の表面がN終端されると、アルミナ層の表面に直接モリブデン膜を形成することができる。次に、前処理の後に、成膜装置10がALD法により、N終端されたアルミナ層の表面にモリブデン膜を形成する流れについて、図6のステップS31~S34に分けて説明する。
次に、本実施形態に係る成膜方法の作用及び効果について説明する。図7は、一実施形態に係る成膜方法による下地膜へのダイレクト成膜の実験結果を参考例と比較して示す図である。
<条件1:本実施形態>
・下地膜 アルミナ(Al2O3)
・トリートメント(前処理)あり
基板温度 :580℃
圧力 :50Torr(6.67kPa)
トリートメント時間 :1800秒
ガス :NH3ガス
・Mo膜の成膜
基板温度 :580℃
圧力 :50Torr(6.67kPa)
MoF6ガス :2.3sccm/1サイクル(500サイクル)
キャリアガス(Ar):1000~20000sccm
H2ガス :1000~10000sccm
時間:
MoF6ガス :2秒
パージ(Ar):0.05~15秒
H2ガス :0.05~15秒
パージ(Ar):0.05~15秒
サイクル数 :500サイクル
<条件2:本実施形態>
・下地膜 アルミナ(Al2O3)
・トリートメント(前処理)あり
基板温度 :530℃
圧力 :50Torr(6.67kPa)
トリートメント時間 :1800秒
ガス :NH3ガス
・Mo膜の成膜
基板温度 :530℃
それ以外は条件1と同じ
<条件3:本実施形態>
・下地膜 アルミナ(Al2O3)
・トリートメント(前処理)あり
基板温度 :460℃
圧力 :7Torr(0.933kPa)
トリートメント時間 :600秒
ガス :NH3ガス
・Mo膜の成膜
基板温度 :460℃
それ以外は条件1と同じ
<条件4:参考例>
・下地膜 アルミナ(Al2O3)
・トリートメント(前処理)なし(なお、成膜前に下地膜を800℃でアニール)
・Mo膜の成膜
基板温度 :530℃
それ以外は条件1と同じ
<条件5:参考例>
・下地膜 窒化チタン(TiN)
・トリートメント(前処理)なし
・W(タングステン)膜の成膜
基板温度 :450℃
圧力 :0.1~20Torr(13.33~2666Pa)
WF6ガス :100~500sccm(500サイクルの総流量)
キャリアガス(N2):1000~10000sccm
H2ガス :500~20000sccm
時間:
WF6ガス :0.05~15秒
パージ(N2):0.05~15秒
H2ガス :0.05~15秒
パージ(N2):0.05~15秒
次に、一実施形態に係る成膜方法によるダイレクト成膜の下地膜依存性について、図8を参照しながら説明する。図8は、一実施形態に係るダイレクト成膜の下地膜依存性の実験結果を示す図である。
最後に、一実施形態の変形例に係る成膜方法について、図10を参照しながら説明する。図10は、一実施形態の変形例に係る成膜方法の各工程での基板の状態を模式的に示した断面図である。
2 載置台
3 シャワーヘッド
4 排気部
5 ガス供給部
6 制御部
10 成膜装置
21 ヒータ
61a Mo含有ガス供給源
63a Arガス供給源
65a 水素含有ガス供給源
67a Arガス供給源
69a 窒素含有ガス供給源
111~114 処理室
120 真空搬送室
131,132 ロードロック室
140 大気搬送室
151~153 ロードポート
161~168 ゲートバルブ
170 制御部
W 基板
Claims (8)
- (a)酸化アルミニウム層が形成された基板を準備する工程と、
(b)加熱手段により530℃以上に加熱した前記基板に窒素を含むガスを供給することにより、前記酸化アルミニウム層の表面を窒素原子により終端する工程と、
(c)前記(b)の後、モリブデンを含む原料ガスと還元ガスとを複数回交互に供給し、前記酸化アルミニウム層の上にモリブデン膜を形成する工程と、
を有する成膜方法。 - 前記(c)においてALDにより前記モリブデン膜を形成する、
請求項1に記載の成膜方法。 - 前記(b)において前記窒素を含むガスにより前記酸化アルミニウム層の上に窒化アルミニウム膜を形成する、
請求項1又は2に記載の成膜方法。 - 前記(b)における前記窒素を含むガスは、NH3ガス、N2ガス、N2H4ガス及びCH3(NH)NH2ガスの少なくともいずれかを含む、
請求項1~3のいずれか一項に記載の成膜方法。 - 前記(b)において前記窒素を含むガスを供給する処理容器内の圧力を50torr以上に維持する、
請求項1~4のいずれか一項に記載の成膜方法。 - 前記(c)において1サイクル毎に2.3sccm以上の流量の前記原料ガスを供給する、
請求項1~5のいずれか一項に記載の成膜方法。 - 前記(c)における前記原料ガスは、MoF6ガスであり、前記還元ガスはH2ガスである、
請求項1~6のいずれか一項に記載の成膜方法。 - 酸化アルミニウム層が形成された基板を配置する載置台と、
加熱手段により530℃以上に加熱した前記基板に窒素を含むガスを供給することにより、前記酸化アルミニウム層の表面を窒素原子により終端した後、モリブデンを含む原料ガスと還元ガスとを複数回交互に供給し、前記酸化アルミニウム層の上にモリブデン膜を形成するガス供給部と、
を有する成膜装置。
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