JP2021050394A - 半導体装置の製造方法及び成膜装置 - Google Patents
半導体装置の製造方法及び成膜装置 Download PDFInfo
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Abstract
Description
一実施形態の窒化チタン(TiN)膜の形成方法は、例えばALDプロセスにより表面にトレンチ、ホール等の凹部が形成された基板上にTiN膜を形成する方法であり、凹部が形成された基板が処理容器内に収容された状態で実行される。基板としては、ALDプロセスを適用可能な基板を広く用いることができる。ALDプロセスを適用可能な基板は、例えばシリコン等で構成された半導体基板である。基板としては、例えばキャパシタ電極を有する半導体装置(例えば、DRAM)の製造に用いられる半導体基板が挙げられる。
図1は、一実施形態のTiN膜の形成方法のガス供給シーケンスの一例を示す図である。図1に示されるTiN膜の形成方法では、工程S11〜S16を含む複数回のサイクルを実行する。工程S11は、NH3の吸着を阻害するNH3阻害剤を供給する工程である。工程S12は、NH3阻害剤の吸着量を調整する工程である。工程S13は、基板にNH3を供給する工程である。工程S14は、NH3をパージする工程である。工程S15は、基板にTiCl4を供給する工程である。工程S16は、TiCl4をパージする工程である。
図3は、一実施形態のTiN膜の形成方法のガス供給シーケンスの別の例を示す図である。図3に示されるTiN膜の形成方法では、工程S31〜S36を含む複数回のサイクルを実行する。工程S31は、TiCl4の吸着を阻害するTiCl4阻害剤を供給する工程である。工程S32は、TiCl4阻害剤の吸着量を調整する工程である。工程S33は、基板にTiCl4を供給する工程である。工程S34は、TiCl4をパージする工程である。工程S35は、基板にNH3を供給する工程である。工程S36は、NH3をパージする工程である。
図5は、一実施形態のTiN膜の形成方法のガス供給シーケンスの更に別の例を示す図である。図5に示されるTiN膜の形成方法では、工程S51〜S58を含む複数回のサイクルを実行する。工程S51は、TiCl4の吸着を阻害するTiCl4阻害剤を供給する工程である。工程S52は、TiCl4阻害剤の吸着量を調整する工程である。工程S53は、基板にTiCl4を供給する工程である。工程S54は、TiCl4及びTiCl4阻害剤をパージする工程である。工程S55は、NH3の吸着を阻害するNH3阻害剤を供給する工程である。工程S56は、NH3阻害剤の吸着量を調整する工程である。工程S57は、基板にNH3を供給する工程である。工程S58は、NH3及びNH3阻害剤をパージする工程である。
一実施形態のTiN膜の形成方法に用いられる成膜装置について、枚葉式の装置を例に挙げて説明する。図6は、一実施形態のTiN膜の形成方法に用いられる成膜装置の一例を示す図である。
成膜装置100の動作の一例について説明する。なお、開始時において、処理容器1内は、排気部4により真空雰囲気となっている。また、ステージ2は搬送位置に移動している。
ソフトウェアMaterials StudioのDMol3モジュールを用い、密度汎関数法(PBE/DNP)により、NH3阻害剤のTiClx層の表面に対する吸着エネルギー及びTiCl4阻害剤のTi−NHx層の表面に対する吸着エネルギーを算出した。
5 ガス供給機構
9 制御部
100 成膜装置
Claims (10)
- TiN膜を含む半導体装置を製造する方法であって、
基板にTiCl4ガスを供給する工程と、
前記TiCl4ガスをパージする工程と、
基板にNH3ガスを供給する工程と、
前記NH3ガスをパージする工程と、
基板にTiCl4又はNH3の吸着を阻害する阻害剤を供給する工程と、
を有し、
前記TiCl4ガスを供給する工程と前記TiCl4ガスをパージする工程と前記NH3ガスを供給する工程と前記NH3ガスをパージする工程とを含む複数回のサイクルを実行し、
前記複数回のサイクルのうち少なくとも一部が、前記阻害剤を供給する工程を含み、
前記阻害剤を供給する工程の後、前記阻害剤をパージすることなく前記TiCl4ガスを供給する工程若しくは前記NH3ガスを供給する工程を実行する、又は、前記TiCl4ガスをパージする工程若しくは前記NH3ガスをパージする工程よりも短い時間前記阻害剤をパージした後に前記TiCl4ガスを供給する工程若しくは前記NH3ガスを供給する工程を実行する、
半導体装置の製造方法。 - 前記阻害剤を供給する工程は、前記TiCl4ガスを供給する工程の後であって前記NH3ガスを供給する工程の前に、NH3の吸着を阻害するNH3阻害剤を供給する工程を含む、
請求項1に記載の半導体装置の製造方法。 - 前記NH3阻害剤は、C=O結合、S=O結合、CN環及びCO環のうち少なくともいずれか1種を有する有機化合物を含む、
請求項2に記載の半導体装置の製造方法。 - 前記NH3阻害剤は、アセトン、DMSO、THF、テトラヒドロフラン又はこれらの誘導体を含む、
請求項3に記載の半導体装置の製造方法。 - 前記阻害剤を供給する工程は、前記NH3ガスを供給する工程の後であって前記TiCl4ガスを供給する工程の前に、TiCl4の吸着を阻害するTiCl4阻害剤を供給する工程を含む、
請求項1乃至4のいずれか一項に記載の半導体装置の製造方法。 - 前記TiCl4阻害剤のTi−NHx層の表面に対する吸着エネルギーは、TiCl4のTi−NHx層の表面に対する吸着エネルギーよりも高い、
請求項5に記載の半導体装置の製造方法。 - 前記TiCl4阻害剤は、BF3、CH3CO2H、BCl3、HCl、Al(CH3)3、H2SO4、HBr又はAlCl3を含む、
請求項6に記載の半導体装置の製造方法。 - 前記基板には凹部が形成されている、
請求項1乃至7のいずれか一項に記載の半導体装置の製造方法。 - 前記阻害剤を供給する工程では、前記凹部の下部よりも上部に多くの前記阻害剤を吸着させる、
請求項8に記載の半導体装置の製造方法。 - 基板を収容する処理容器と、
前記処理容器の内部にガスを供給するガス供給機構と、
制御部と、
を備え、
前記制御部は、
前記基板にTiCl4ガスを供給する工程と、
前記TiCl4ガスをパージする工程と、
前記基板にNH3ガスを供給する工程と、
前記NH3ガスをパージする工程と、
前記基板にTiCl4又はNH3の吸着を阻害する阻害剤を供給する工程と、
を実行するように前記ガス供給機構を制御し、
前記制御部は、
前記TiCl4ガスを供給する工程と前記TiCl4ガスをパージする工程と前記NH3ガスを供給する工程と前記NH3ガスをパージする工程とを含む複数回のサイクルを実行し、
前記複数回のサイクルのうち少なくとも一部が、前記阻害剤を供給する工程を含み、
前記阻害剤を供給する工程の後、前記阻害剤をパージすることなく前記TiCl4ガスを供給する工程若しくは前記NH3ガスを供給する工程を実行する、又は、前記TiCl4ガスをパージする工程若しくは前記NH3ガスをパージする工程よりも短い時間前記阻害剤をパージした後に前記TiCl4ガスを供給する工程若しくは前記NH3ガスを供給する工程を実行するように、前記ガス供給機構を制御する、
成膜装置。
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