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    • 6. 发明授权
    • High pressure high non-reactive diluent gas content high plasma ion density plasma oxide etch process
    • 高压高反应性稀释气体含量高等离子体离子密度等离子体氧化物蚀刻工艺
    • US06238588B1
    • 2001-05-29
    • US08733554
    • 1996-10-21
    • Kenneth CollinsDavid GroechelRaymond HungMichael RiceGerald YinJian DingChunshi Cui
    • Kenneth CollinsDavid GroechelRaymond HungMichael RiceGerald YinJian DingChunshi Cui
    • B44C122
    • 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 20 mT, 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 20 mT, and applying plasma source power into the chamber to form a high ion density plasma having an ion density in excess of 1010 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 {fraction (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含有碳和氟的聚合物和蚀刻剂前体气体供应到室中 在低于大约20mT的低压范围内,将第二流量的第二流量的相对非反应性气体供应到室内的总气体流速的约一半以上,并与第一流量 将气体压力保持在高于20mT的高压范围内,并将等离子体源功率施加到腔室中以形成离子密度超过每立方厘米1010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趋肤深度超过感应天线和工件之间的间隙的{分数(1/10)}的压力。
    • 9. 发明授权
    • Oxide etch process using hexafluorobutadiene and related unsaturated hydrofluorocarbons
    • 使用六氟丁二烯和相关不饱和氢氟烃的氧化物蚀刻工艺
    • US06174451B1
    • 2001-01-16
    • US09193056
    • 1998-11-16
    • Raymond HungJoseph P. CaulfieldHongching ShanRuiping WangGerald Z. Yin
    • Raymond HungJoseph P. CaulfieldHongching ShanRuiping WangGerald Z. Yin
    • H01L2131
    • H01L21/31116
    • An oxide etching process, particular useful for selectively etching oxide over a feature having a non-oxide composition, such as silicon nitride and especially when that feature has a corner that is prone to faceting during the oxide etch. The invention uses one of three unsaturated 3- and 4-carbon fluorocarbons, specifically hexafluorobutadiene (C4F6), pentafluoropropylene (C3HF5), and trifluoropropyne (C3HF3), all of which have boiling points below 10° C. and are commercially available. The unsaturated hydrofluorocarbon together with argon is excited into a high-density plasma in a reactor which inductively couples plasma source power into the chamber and RF biases the pedestal electrode supporting the wafer. Preferably, a two-step etch is used process is used in which the above etching gas is used in the main step to provide a good vertical profile and a more strongly polymerizing fluorocarbon such as difluoromethane (CH2F2) is added in the over etch to protect the nitride corner.
    • 一种氧化物蚀刻工艺,特别用于在具有非氧化物组成的特征(例如氮化硅)上选择性地蚀刻氧化物,特别是当该特征具有在氧化物蚀刻期间易于刻面的拐角时。 本发明使用沸点低于10℃的三种不饱和3-和4-碳碳氟化合物,特别是六氟丁二烯(C 4 F 6),五氟丙烯(C 3 HF 5)和三氟丙炔(C 3 H 3 F 3)中的一种,并且可商购。 将不饱和氢氟烃与氩一起激发成反应器中的高密度等离子体,其将等离子体源功率感应耦合到室中,并且RF偏置支撑晶片的基座电极。 优选地,使用两步蚀刻方法,其中在主要步骤中使用上述蚀刻气体以提供良好的垂直分布,并且在过蚀刻中加入更强的聚合碳氟化合物如二氟甲烷(CH 2 F 2)以保护 氮化物角。
    • 10. 发明授权
    • Highly selective oxide etch process using hexafluorobutadiene
    • 使用六氟丁二烯的高选择性氧化物蚀刻工艺
    • US06613691B1
    • 2003-09-02
    • US09675360
    • 2000-09-29
    • Raymond HungJoseph P. CaulfieldHongching ShanRuiping WangGerald Z. Yin
    • Raymond HungJoseph P. CaulfieldHongching ShanRuiping WangGerald Z. Yin
    • H01L21475
    • H01L21/31116
    • An oxide etching process, particular useful for selectively etching oxide over a feature having a non-oxide composition, such as silicon nitride and especially when that feature has a corner that is prone to faceting during the oxide etch. The invention preferably uses the unsaturated 4-carbon fluorocarbons, specifically hexafluorobutadiene (C4F6), which has a below 10°C. and is commercially available. The hexafluorobutadiene together with argon is excited into a high-density plasma in a reactor which inductively couples plasma source power into the chamber and RF biases the pedestal electrode supporting the wafer. Preferably, a two-step etch is used process is used in which the above etching gas is used in the main step to provide a good vertical profile and a more strongly polymerizing fluorocarbon such as difluoromethane (CH2F2) is added in the over etch to protect the nitride corner.
    • 一种氧化物蚀刻工艺,特别用于在具有非氧化物组成的特征(例如氮化硅)上选择性地蚀刻氧化物,特别是当该特征具有在氧化物蚀刻期间易于刻面的拐角时。 本发明优选使用低于10℃的不饱和4-碳碳氟化合物,特别是六氟丁二烯(C 4 F 6)。 并且是可商购的。 将六氟丁二烯与氩一起激发成反应器中的高密度等离子体,其将等离子体源功率感应耦合到室中,并且RF偏置支撑晶片的基座电极。 优选地,使用两步蚀刻方法,其中在主要步骤中使用上述蚀刻气体以提供良好的垂直分布,并且在过蚀刻中加入更强的聚合碳氟化合物如二氟甲烷(CH 2 F 2)以保护 氮化物角。