JP6948803B2 - ガス供給装置、ガス供給方法及び成膜方法 - Google Patents
ガス供給装置、ガス供給方法及び成膜方法 Download PDFInfo
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- YOUIDGQAIILFBW-UHFFFAOYSA-J tetrachlorotungsten Chemical compound Cl[W](Cl)(Cl)Cl YOUIDGQAIILFBW-UHFFFAOYSA-J 0.000 claims description 2
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- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 1
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- 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
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
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- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- KPGXUAIFQMJJFB-UHFFFAOYSA-H tungsten hexachloride Chemical compound Cl[W](Cl)(Cl)(Cl)(Cl)Cl KPGXUAIFQMJJFB-UHFFFAOYSA-H 0.000 description 1
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Description
図1は、本実施形態に係るガス供給装置を備える成膜装置の一例を示す概略断面図である。本実施形態に係る成膜装置は、原子層堆積(ALD:Atomic Layer Deposition)法による成膜、及び化学的気相成長(CVD:Chemical Vapor Deposition)法による成膜が実施可能な装置として構成されている。
本実施形態に係るガス供給方法について、前述した成膜装置を用いてタングステン膜を成膜する場合(成膜方法)を例に挙げて説明する。本実施形態に係るガス供給方法は、成膜原料タンク91の交換後であって、ウエハWに対する成膜を行う前に行う成膜原料の初期安定化工程と、成膜原料の初期安定化工程の後に行う成膜工程とを含む。
成膜原料の初期安定化工程について説明する。図2は、本実施形態に係る成膜原料の初期安定化工程を示すフローチャートである。
なお、F0は、1周期時間(sec)における流量計97の検出値をF1(scc)、マスフローコントローラ94の流量の検出値をF2(scc)、マスフローコントローラ102の流量の検出値をF3(scc)とすると、以下の(2)式により算出される。
また、C.F.は、Conversion Factor(定数)であり、本実施形態では0.2である。また、WCl6の分子量Mは、396.56である。閾値は、例えば13mg/minである。
成膜工程について説明する。成膜工程は、前述した成膜原料の初期安定化工程において、制御部6が、WCl6ガスを含むN2ガスを処理容器1内へ供給可能と判断した場合に実行される。
実施例では、図1の成膜装置において成膜原料タンク91の交換後、WCl6ガスを300mg/分の流量でエバックライン104を介して排気機構42により所定時間排気し、その後SiO2膜及びTiN膜が形成されたウエハWの上にタングステン膜を成膜した。また、成膜したタングステン膜の膜特性を評価した。
ウエハ温度:540℃
処理容器内圧力:30Torr(4.0×103Pa)
WCl6ガス流量:300mg/分
ステップS1の時間:0.3秒
ステップS2の時間:0.3秒
ステップS3の時間:0.1秒
ステップS4の時間:0.3秒
サイクル回数:900サイクル
図5は、タングステン膜の膜中不純物濃度の測定結果を示す図であり、二次イオン質量分析法(SIMS:Secondary Ion Mass Spectrometry)による測定結果を示している。図5(a)は試料1及び試料3の膜中酸素(O)濃度の測定結果を示し、図5(b)は試料1及び試料3の膜中塩素(Cl)濃度の測定結果を示している。図5(a)中、横軸はSiO2膜、TiN膜及びタングステン(W)膜の積層方向の深さ(nm)を示し、縦軸は膜中O濃度を示している。図5(b)中、横軸はSiO2膜、TiN膜及びタングステン(W)膜の積層方向の深さ(nm)を示し、縦軸は膜中Cl濃度を示している。また、図5(a)及び図5(b)において、実線は試料1の測定結果を示し、破線は試料3の測定結果を示している。
2 サセプタ
3 シャワーヘッド
4 排気部
5 処理ガス供給機構
6 制御部
41 排気配管
42 排気機構
51 WCl6ガス供給機構
52 第1のH2ガス供給源
80 バッファタンク
80a 圧力計
91 成膜原料タンク
91a ヒータ
92 キャリアガス配管
93 キャリアN2ガス供給源
94 マスフローコントローラ
95a 開閉バルブ
95b 開閉バルブ
96a 開閉バルブ
96b 開閉バルブ
97 流量計
98 バイパス配管
99 開閉バルブ
100 希釈N2ガス供給ライン
101 希釈N2ガス供給源
102 マスフローコントローラ
103 開閉バルブ
104 エバックライン
105 開閉バルブ
106 開閉バルブ
107 圧力制御バルブ
W ウエハ
Claims (6)
- 原料容器内の原料を気化させて、キャリアガスと共に処理容器内へ原料ガスを供給するガス供給装置であって、
前記原料容器の上流側に接続され、前記キャリアガスの流量を制御するマスフローコントローラと、
前記原料容器の下流側に接続された流量計と、
前記原料容器の交換後、前記マスフローコントローラにより一定流量に制御された前記キャリアガスに対する前記流量計の検出値が安定するまで前記処理容器内へ前記原料ガスを供給しないように制御する制御部と、
を備え、
前記制御部は、前記流量計の検出値と前記マスフローコントローラの流量の検出値とに基づいて算出される前記原料ガスの流量の時間変化率が閾値以下となった場合、前記流量計の検出値が安定したと判断する、
ガス供給装置。 - 前記制御部は、前記流量計の検出値が安定するまでの間、前記原料ガスを前記処理容器内へ供給することなく排気する、
請求項1に記載のガス供給装置。 - 一端が前記流量計の下流側に接続され、他端が前記処理容器の排気配管に接続されたエバックラインを備え、
前記原料ガスは、前記エバックラインを介して排気される、
請求項2に記載のガス供給装置。 - 前記原料は、塩化タングステンの固体原料である、
請求項1乃至3のいずれか一項に記載のガス供給装置。 - 原料容器内の原料を気化させて、キャリアガスと共に処理容器内へ原料ガスを供給するガス供給方法であって、
前記原料容器の交換後、前記原料容器の上流側に接続されたマスフローコントローラにより一定流量に制御された前記キャリアガスに対する、前記原料容器の下流側に接続された流量計の検出値が安定するまで前記処理容器内へ前記原料ガスを供給しないように制御し、
前記流量計の検出値と前記マスフローコントローラの流量の検出値とに基づいて算出される前記原料ガスの流量の時間変化率が閾値以下となった場合、前記流量計の検出値が安定したと判断する、
ガス供給方法。 - 原料容器内の原料を気化させて、キャリアガスと共に処理容器内へ原料ガスを供給するステップと、前記処理容器内へ前記原料ガスを還元する還元ガスを供給するステップとを繰り返すことで金属膜を成膜する成膜方法であって、
前記原料容器の交換後、前記原料容器の上流側に接続されたマスフローコントローラにより一定流量に制御された前記キャリアガスに対する、前記原料容器の下流側に接続された流量計の検出値が安定したか否かを判定する初期安定化工程と、
前記初期安定化工程において、前記流量計の検出値が安定したと判断された後、前記処理容器内へ前記原料ガスを供給して前記金属膜を成膜する成膜工程と、
を有し、
前記初期安定化工程において、前記流量計の検出値と前記マスフローコントローラの流量の検出値とに基づいて算出される前記原料ガスの流量の時間変化率が閾値以下となった場合、前記流量計の検出値が安定したと判断する、
成膜方法。
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