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    • 10. 发明公开
    • High pressure plasma oxide etch process
    • Verfahren zumÄtzeneiner Oxids mit einer Hochdruckplasma
    • EP0840365A3
    • 2003-10-29
    • EP97308222.5
    • 1997-10-16
    • Applied Materials, Inc.
    • Collins, KennethGroechel, DavidHung, RaymondRice, MichaelYin, Gerald ZheyaoDing, JianCui, Chunshi
    • H01L21/311H01J37/32
    • H01L21/02063C23C16/517H01F2029/143H01J37/32082H01J37/321H01J37/32146H01J37/32165H01J37/32458H01J37/32467H01J37/32522H01J37/32688H01J37/32706H01J37/32871H01J2237/3343H01J2237/3345H01J2237/3346H01L21/31116H01L21/6831
    • The invention is embodied in a method of processing a semiconductor workpiece in a plasma reactor chamber, including supplying a polymer and etchant precursor gas containing at least carbon and fluorine into the chamber at a first flow rate sufficient of itself to maintain a gas pressure in the chamber in a low pressure range below about 20mT, supplying a relatively non-reactive gas into the chamber at second flow rate sufficient about one half or more of the total gas flow rate into the chamber, in combination with the first flow rate of the precursor gas, to maintain the gas pressure in the chamber in a high pressure range above 20mT, and applying plasma source power into the chamber to form a high ion density plasma having an ion density in excess of 10 10 ions per cubic centimeter. In one application of the invention, the workpiece includes an oxygen-containing overlayer to be etched by the process and a non-oxygen-containing underlayer to be protected from etching, the precursor gas dissociating in the plasma into fluorine-containing etchant species which etch the oxygen-containing layer and carbon-containing polymer species which accumulate on the non-oxygen-containing underlayer. Alternatively, the high pressure range may be defined as a pressure at which the skin depth of the inductive field exceeds 1/10 of the gap between the inductive antenna and the workpiece.
    • 本发明体现在一种在等离子体反应器室中处理半导体工件的方法,包括以足以自动维持气体压力的第一流量将至少包含至少含有碳和氟的聚合物和蚀刻剂前体气体供应到室中 室在低于约20mT的低压范围内,以相对于前体的总气体流速足够约一半或更多的第二流量向腔室供应相对非反应性气体,与前体的第一流速相结合 气体,以保持室内的气体压力在高于20mT的高压范围内,并且将等离子体源功率施加到室中以形成离子密度超过每立方厘米10 10离子的高离子密度等离子体。 在本发明的一个应用中,工件包括通过该方法蚀刻的含氧覆层和不受蚀刻保护的非含氧底层,前体气体在等离子体中解离成含氟蚀刻剂,其蚀刻 含氧层和积聚在非含氧底层上的含碳聚合物种类。 或者,高压范围可以被定义为感应场的皮肤深度超过感应天线和工件之间间隙的1/10的压力。