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    • 26. 发明授权
    • Self-cleaning polymer-free top electrode for parallel electrode etch
operation
    • 用于平行电极蚀刻操作的自清洁聚合物顶部电极
    • US5585012A
    • 1996-12-17
    • US357622
    • 1994-12-15
    • Robert WuHyman J. LevinsteinHongching Shan
    • Robert WuHyman J. LevinsteinHongching Shan
    • H05H1/46H01J37/32H01L21/302H01L21/3065H05H1/00
    • H01J37/32862H01J37/32082H01J37/32532Y10S156/916Y10S438/905
    • A plasma etch reactor and a related method of its operation to provide self-cleaning of its top electrode, which is subject to being coated by polymer deposits during normal operation. In one form of the invention, radio-frequency (rf) power is applied to the top electrode on a continuous basis, but at a much lower power level than that of a primary rf power source used to supply power through a lower electrode, to generate and sustain a plasma in the reactor. The small rf power applied through the top electrode is selected to be of such a level as to remove deposits from the electrode continuously, as they are formed, but without removing any significant amount of electrode material. In another form of the invention, power is applied to the top electrode periodically during cleaning periods and power supply to the lower electrode is suspended during the cleaning periods. The two cleaning approaches may also be combined, with continuous cleaning being supplemented with occasional or periodic dry cleaning while etch processing is suspended.
    • 一种等离子体蚀刻反应器及其操作的相关方法,以提供其顶部电极的自清洁,其在正常操作期间被聚合物沉积物涂覆。 在本发明的一种形式中,射频(RF)功率连续地施加到顶电极,但是功率水平远低于用于通过下电极供电的初级rf电源的功率水平, 在反应器中产生和维持等离子体。 选择通过顶部电极施加的小射频功率的水平,以便在形成电极时不断地从电极中去除沉积物,而不去除任何显着量的电极材料。 在本发明的另一种形式中,在清洁期间周期性地向上电极施加电力,并且在清洁期间向下电极供电被暂停。 两种清洁方法也可以组合,连续清洁补充有偶尔或周期性的干洗,而蚀刻处理被暂停。