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    • 8. 发明授权
    • Insulation film etching method
    • 绝缘膜蚀刻方法
    • US06967171B2
    • 2005-11-22
    • US10653707
    • 2003-08-28
    • Kiwamu FujimotoNobuhiro Wada
    • Kiwamu FujimotoNobuhiro Wada
    • H01L21/3065H01L21/311H01L21/768H01L23/522H01L21/302
    • H01L21/31116
    • The insulation film etching method according to the present invention prevents the pause of etching an insulation film while ensuring a good anisotropic (vertical) configuration and high selectivity to both the mask and the base film.When the first step plasma etching using CHF3/Ar/N2 mixed gas is ended, Ar gas as a purging gas is fed into a processing vessel from an Ar gas supply source 46 with the plasmas extinguished, whereby residual hydrogen and hydrogen compounds in the processing vessel 10 are whirled by the purging gas to be discharged through an exhaust port 10b and through an exhaust pipe 52. When the purging step is completed, the second step plasma etching is performed with C4F8/Ar/N2 mixed gas.
    • 根据本发明的绝缘膜蚀刻方法防止了对绝缘膜的蚀刻的暂停,同时确保了对于掩模和基底膜的良好的各向异性(垂直)结构和高选择性。 当使用CHF 3 / Ar / N 2 H 2混合气体的第一级等离子体蚀刻结束时,作为清洗气体的Ar气体从Ar气体供给 源46与等离子体熄灭,由此处理容器10中的残余氢和氢化合物被吹扫气体旋转,以通过排气口10b通过排气管52排出。当清洗步骤完成时,第二步骤 用C 4 N 8 N 8 / Ar / N 2 N 2混合气体进行等离子体蚀刻。