JP2016222954A - 金属膜の成膜方法 - Google Patents
金属膜の成膜方法 Download PDFInfo
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 77
- 239000002184 metal Substances 0.000 title claims abstract description 77
- 238000000151 deposition Methods 0.000 title abstract description 14
- 238000010926 purge Methods 0.000 claims abstract description 44
- 229910001510 metal chloride Inorganic materials 0.000 claims abstract description 35
- 239000002994 raw material Substances 0.000 claims abstract description 30
- 239000000758 substrate Substances 0.000 claims abstract description 22
- 230000001965 increasing effect Effects 0.000 claims abstract description 8
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 138
- 229910052721 tungsten Inorganic materials 0.000 claims description 137
- 239000010937 tungsten Substances 0.000 claims description 137
- 238000000034 method Methods 0.000 claims description 73
- 230000008569 process Effects 0.000 claims description 27
- YOUIDGQAIILFBW-UHFFFAOYSA-J tetrachlorotungsten Chemical compound Cl[W](Cl)(Cl)Cl YOUIDGQAIILFBW-UHFFFAOYSA-J 0.000 claims description 20
- 230000015572 biosynthetic process Effects 0.000 claims description 16
- 238000003860 storage Methods 0.000 claims description 11
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract description 4
- 230000009467 reduction Effects 0.000 abstract description 3
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 327
- 238000000231 atomic layer deposition Methods 0.000 description 20
- 238000005530 etching Methods 0.000 description 19
- 238000012545 processing Methods 0.000 description 18
- 238000005755 formation reaction Methods 0.000 description 16
- 230000007246 mechanism Effects 0.000 description 15
- 239000004065 semiconductor Substances 0.000 description 13
- 239000012159 carrier gas Substances 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 12
- 238000005229 chemical vapour deposition Methods 0.000 description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 11
- 230000009471 action Effects 0.000 description 7
- 230000008021 deposition Effects 0.000 description 7
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 229910004298 SiO 2 Inorganic materials 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000001039 wet etching Methods 0.000 description 5
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 4
- 239000011737 fluorine Substances 0.000 description 4
- 229910052731 fluorine Inorganic materials 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- KPGXUAIFQMJJFB-UHFFFAOYSA-H tungsten hexachloride Chemical compound Cl[W](Cl)(Cl)(Cl)(Cl)Cl KPGXUAIFQMJJFB-UHFFFAOYSA-H 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000005240 physical vapour deposition Methods 0.000 description 3
- 238000006722 reduction reaction Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 230000003028 elevating effect Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 150000003658 tungsten compounds Chemical class 0.000 description 2
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910010037 TiAlN Inorganic materials 0.000 description 1
- 229910010282 TiON Inorganic materials 0.000 description 1
- 229910008482 TiSiN Inorganic materials 0.000 description 1
- 229910003091 WCl6 Inorganic materials 0.000 description 1
- 229910008807 WSiN Inorganic materials 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- QRXWMOHMRWLFEY-UHFFFAOYSA-N isoniazide Chemical compound NNC(=O)C1=CC=NC=C1 QRXWMOHMRWLFEY-UHFFFAOYSA-N 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- PDKHNCYLMVRIFV-UHFFFAOYSA-H molybdenum;hexachloride Chemical compound [Cl-].[Cl-].[Cl-].[Cl-].[Cl-].[Cl-].[Mo] PDKHNCYLMVRIFV-UHFFFAOYSA-H 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 229910021332 silicide Inorganic materials 0.000 description 1
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- OEIMLTQPLAGXMX-UHFFFAOYSA-I tantalum(v) chloride Chemical compound Cl[Ta](Cl)(Cl)(Cl)Cl OEIMLTQPLAGXMX-UHFFFAOYSA-I 0.000 description 1
- NXHILIPIEUBEPD-UHFFFAOYSA-H tungsten hexafluoride Chemical compound F[W](F)(F)(F)(F)F NXHILIPIEUBEPD-UHFFFAOYSA-H 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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Abstract
Description
図1は本発明に係る金属膜の成膜方法の実施に用いられるタングステン膜の成膜装置の一例を示す断面図である。
次に、以上のように構成された成膜装置100を用いて行われるタングステン膜の成膜方法の実施形態について説明する。
最初に成膜方法の概要について説明する。
本実施形態に係る成膜方法は、複雑形状部分と平坦形状部分を有するウエハに対してタングステン膜を成膜する場合に適用される。なお、複雑形状部分とは、相対的にアスペクト比が高い凹部が形成された部分をいい、平坦形状部分とは、凹部が形成されていないか、または相対的にアスペクト比が低い凹部が形成された部分をいう。
塩化タングステンガスであるWCl6ガスと還元ガスであるH2ガスを用いてALD法によりタングステン膜を成膜する場合、図3に示すように、WCl6ガスの吸着と、還元ガスであるH2ガスによるWCl6の還元とを繰り返すが、吸着されたWCl6を還元してタングステンを生成する反応は以下の(1)式のようになり、HClを生成する。
WCl6(ad)+3H2(g)→W(s)+6HCl ・・・(1)
この反応により生成されたHClは、強いエッチング性を有するため、以下の(2)の反応により成膜されたタングステン膜をエッチングする。
W(s)+5WCl6(g)→6WClx ・・・(2)
TiN(s)+WCl6(g)→TiCl4(g)+WClx(g)・・・(3)
下地膜203として他のチタン系材料膜およびタングステン化合物膜を用いた場合も同様に塩化タングステンガスであるWCl6ガスによりエッチングされるから、第1のタングステン膜205から成膜することが好ましい。
次に、図1の成膜装置を用いた場合の具体的なシーケンスについて説明する。
まず、所定の構造を有するウエハWを、搬入出口11を介してチャンバー1内に搬入し、ヒーター21により所定温度に加熱されたサセプタ2上に載置し、サセプタ2を処理位置まで上昇させ、チャンバー1内を所定の真空度まで真空引きするとともに、開閉バルブ104、95a、95b、99を閉じ、開閉バルブ102、103、96a,96bを開けて、エバック配管101を介して成膜原料タンク91内も同様に真空引きした後、開閉バルブ76および開閉バルブ78を開け、開閉バルブ73,74,75,77,79を閉じて、第1N2ガス供給源54および第2N2ガス供給源55から、第1連続N2ガス供給ライン66および第2連続N2ガス供給ライン68を経てN2ガスをチャンバー1内に供給して圧力を上昇させ、サセプタ2上のウエハWの温度を安定させる。
以下に、第1のタングステン膜205および第2のタングステン膜206の好ましい成膜条件について示す。
i)ALD
圧力:20〜100Torr(2666〜13330Pa)
温度:300℃以上(より好ましくは450〜600℃)
WCl6ガス流量:0.1〜10sccm(mL/min)
(キャリアガス流量:1〜1000sccm(mL/min))
WCl6ガス分圧(既述):1Torr(133.3Pa)以下(より好ましくは0.1Torr(13.33Pa)以下)
メインH2ガス流量:10〜5000sccm(mL/min)
連続供給N2ガス流量:10〜10000sccm(mL/min)
(第1および第2連続N2ガス供給ライン66,68)
フラッシュパージN2ガス流量:100〜100000sccm(mL/min)
(第1および第2フラッシュパージライン67,69)
ステップS1の時間(1回あたり):0.01〜5sec
ステップS3の時間(1回あたり):0.1〜5sec
ステップS2、S4の時間(パージ)(1回あたり):0.1〜5sec
ステップS1の添加H2ガス供給時間(1回あたり):0.01〜0.3sec
成膜原料タンクの加温温度:130〜190℃
ii)CVD
圧力:20〜100Torr(2666〜13330Pa)
温度:300℃以上(好ましくは450〜600℃)
WCl6ガス流量:0.1〜10sccm(mL/min)
(キャリアガス流量:1〜1000sccm(mL/min))
WCl6ガス分圧(既述):1Torr(133.3Pa)以下(好ましくは0.1Torr(13.33Pa)以下)
メインH2ガス流量:10〜5000sccm(mL/min)
N2ガス流量:10〜10000sccm(mL/min)
圧力:5〜50Torr(666.5〜6665Pa)
温度:300℃以上(好ましくは450〜600℃)
WCl6ガス流量:3〜60sccm(mL/min)
(キャリアガス流量:100〜2000sccm(mL/min))
WCl6ガス分圧:0.5〜10Torr(66.7〜1333Pa)
メインH2ガス流量:2000〜8000sccm(mL/min)
添加H2ガス流量(既述):100〜500sccm(mL/min)
連続供給N2ガス流量:100〜500sccm(mL/min)
(第1および第2連続N2ガス供給ライン66,68)
フラッシュパージN2ガス流量:500〜3000sccm(mL/min)
(第1および第2フラッシュパージライン67,69)
ステップS1の時間(1回あたり):0.01〜5sec
ステップS3の時間(1回あたり):0.1〜5sec
ステップS2、S4の時間(パージ)(1回あたり):0.1〜5sec
ステップS1の添加H2ガス供給時間(1回あたり):0.01〜0.3sec
成膜原料タンクの加温温度:130〜170℃
以上、本発明の実施形態について説明したが、本発明は上記実施形態に限定されることなく種々変形可能である。例えば、上記実施形態では、金属塩化物として塩化タングステンを用いてタングステン膜を成膜する場合について示したが、金属塩化物ガスと還元ガスをシーケンシャルに供給して金属膜を成膜する場合であれば適用可能であり、例えば塩化モリブデンガスと還元ガスを用いてモリブデン膜を成膜する場合や、塩化タンタルガスと還元ガスを用いてタンタル膜を成膜する場合に適用することができる。
2;サセプタ
3;シャワーヘッド
4;排気部
5;ガス供給機構
6;制御部
51;WCl6ガス供給機構
52;第1H2ガス供給源
53;第2H2ガス供給源
54;第1N2ガス供給源
55;第2N2ガス供給源
61;WCl6ガス供給ライン
62;第1H2ガス供給ライン
63;第2H2ガス供給ライン
66;第1連続N2ガス供給ライン
67;第1フラッシュパージライン
68;第2連続N2ガス供給ライン
69;第2フラッシュパージライン
73,74,75,76,77,78,79,102,103;開閉バルブ
91;成膜原料タンク
100;成膜装置
101;エバック配管
203;下地膜
204;タングステン膜
205;第1のタングステン膜
206;第2のタングステン膜
207;初期タングステン膜
209;トップコートタングステン膜
W;半導体ウエハ
Claims (13)
- 減圧雰囲気下に保持されたチャンバー内に配置された、複雑形状部分と平坦形状部分とを有する被処理基板に対し、原料ガスとしての金属塩化物ガス、および金属塩化物を還元する還元ガスを、前記チャンバー内のパージを挟んでシーケンシャルに前記チャンバー内に供給して金属膜を成膜する金属膜の成膜方法であって、
前記金属塩化物原料の供給量を相対的に少なくして第1の金属膜を成膜する工程と、前記金属塩化物原料の供給量を相対的に多くして第2の金属膜を成膜する工程とを実施することを特徴とする金属膜の成膜方法。 - 前記第1の金属膜を成膜する工程と、前記第2の金属膜を成膜する工程とを交互に実施することを特徴とする請求項1に記載の金属膜の成膜方法。
- 前記被処理基板は表面に下地膜を有し、前記下地膜の上に前記第1の金属膜を成膜することを特徴とする請求項1または請求項2に記載の金属膜の成膜方法。
- 前記被処理基板は表面に下地膜を有し、前記金属膜と前記下地膜との間に、前記金属塩化物ガスの供給量を前記第2の金属膜を成膜する工程よりも少なくして、前記金属塩化物ガスおよび前記還元ガスをパージガスの供給を挟んでシーケンシャルに、または前記金属塩化物ガスおよび前記還元ガスを同時に前記チャンバー内に供給して、初期金属膜を成膜することを特徴とする請求項1または請求項2に記載の金属膜の成膜方法。
- 前記金属膜の成膜の最後を、前記第1の金属膜を成膜する工程とす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項に記載の金属膜の成膜方法。
- 前記金属膜の上に、前記金属塩化物ガスの供給量を前記第2の金属膜を成膜する工程よりも少なくして、前記金属塩化物ガスおよび前記還元ガスをパージガスの供給を挟んでシーケンシャルに、または前記金属塩化物ガスおよび前記還元ガスを同時に前記チャンバー内に供給して、トップコート金属膜を成膜す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項に記載の金属膜の成膜方法。
- 前記金属塩化物として塩化タングステンを用いて、前記金属膜としてタングステン膜を成膜することを特徴とする請求項1から請求項6のいずれか1項に記載の金属膜の成膜方法。
- 前記第1の金属膜を成膜する際の前記チャンバー内における前記塩化タングステンガスの分圧が1Torr以下になるように前記塩化タングステンガスを供給することを特徴とする請求項7に記載の金属膜の成膜方法。
- 前記第2の金属膜を成膜する際の前記チャンバー内における前記塩化タングステンガスの分圧が0.5〜10Torrの範囲になるように前記塩化タングステンガスを供給することを特徴とする請求項7または請求項8に記載の金属膜の成膜方法。
- 前記第1の金属膜および前記第2の金属膜の成膜処理の際に、前記被処理基板の温度が300℃以上、前記チャンバー内の圧力が5Torr以上であることを特徴とする請求項7から請求項9のいずれか1項に記載の金属膜の成膜方法。
- 前記塩化タングステンは、WCl6、WCl5、WCl4のいずれかであることを特徴とする請求項7から請求項10のいずれか1項に記載の金属膜の成膜方法。
- 前記還元ガスは、H2ガス、SiH4ガス、B2H6ガス、NH3ガスの少なくとも1種であ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項に記載の金属膜の成膜方法。
- コンピュータ上で動作し、成膜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12のいずれかの金属膜の成膜方法が行われるように、コンピュータに前記成膜装置を制御させることを特徴とする記憶媒体。
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WO2021210441A1 (ja) * | 2020-04-15 | 2021-10-21 | 東京エレクトロン株式会社 | タングステン膜を形成する方法及び装置、並びにタングステン膜を形成する前の中間膜の形成を行う装置 |
JP7487538B2 (ja) | 2020-04-15 | 2024-05-21 | 東京エレクトロン株式会社 | タングステン膜を形成する方法及び装置、並びにタングステン膜を形成する前の中間膜の形成を行う装置 |
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KR101892344B1 (ko) | 2018-08-27 |
TW201715084A (zh) | 2017-05-01 |
CN106191815A (zh) | 2016-12-07 |
CN106191815B (zh) | 2019-07-30 |
KR20160140402A (ko) | 2016-12-07 |
US20160348234A1 (en) | 2016-12-01 |
US10131986B2 (en) | 2018-11-20 |
JP6478813B2 (ja) | 2019-03-06 |
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