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    • 6. 发明申请
    • Dielectric plasma etch process with in-situ amorphous carbon mask with improved critical dimension and etch selectivity
    • 介质等离子体蚀刻工艺,具有改进的临界尺寸和蚀刻选择性的原位无定形碳掩模
    • US20070249171A1
    • 2007-10-25
    • US11434951
    • 2006-05-16
    • Shing-Li SungWonseok LeeJudy WangShawming Ma
    • Shing-Li SungWonseok LeeJudy WangShawming Ma
    • H01L21/461H01L21/302
    • H01L21/76802H01L21/0332H01L21/31144H01L21/76814
    • A plasma-enhanced process is performed in a single plasma reactor chamber for etching a thin film layer on a workpiece, using a hard mask layer including an amorphous carbon layer (ACL) overlying the thin film layer and an anti-reflection coating (ARC) overlying the ACL. The process includes etching a pattern in the ARC in accordance with a photoresist mask overlying the ARC, using a plasma produced from a fluorine-containing process gas, and then removing fluorine-containing residue from the reactor chamber and/or workpiece by performing a first transition step by replacing the fluorine-containing process gas with an inert species process gas and maintaining a plasma in the reactor chamber. A pattern is then etched in the ACL using the ARC as an etch mask by replacing the argon process gas with a process gas containing hydrogen while maintaining a plasma in the chamber. Thereafter, hydrogen-containing residue is removed from the reactor and/or from the chamber by performing a flush step by replacing the hydrogen-containing process gas with argon gas and maintaining a plasma in the chamber. The process continues with etching a pattern in the thin film layer using the ACL as a hard mask by replacing the argon gas in the chamber with a species capable of etching the thin film layer.
    • 使用包括覆盖在薄膜层上的无定形碳层(ACL)和抗反射涂层(ARC)的硬掩模层,在单个等离子体反应器室中进行等离子体增强处理,以蚀刻工件上的薄膜层, 覆盖ACL。 该方法包括使用由含氟工艺气体产生的等离子体,根据覆盖在ARC上的光致抗蚀剂掩模蚀刻ARC中的图案,然后通过执行第一步骤从反应器室和/或工件中除去含氟残留物 通过用惰性物质处理气体代替含氟工艺气体并在反应器室中维持等离子体来实现。 然后使用ARC作为蚀刻掩模在ACL中蚀刻图案,通过用含有氢气的工艺气体代替氩气工艺气体,同时保持室内的等离子体。 此后,通过用氩气代替含氢处理气体并在室内维持等离子体,通过进行冲洗步骤从反应器和/或从室除去含氢残留物。 该过程继续以使用ACL作为硬掩模在薄膜层中蚀刻图案,通过用能够蚀刻薄膜层的种类替换室内的氩气。