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    • 9. 发明授权
    • Process for forming a via in an integrated circuit structure by etching
through an insulation layer while inhibiting sputtering of underlying
metal
    • 用于通过蚀刻绝缘层同时抑制下面的金属的溅射来在集成电路结构中形成通孔的工艺
    • US5176790A
    • 1993-01-05
    • US766481
    • 1991-09-25
    • Paul ArleoJon HenriGraham HillsJerry WongRobert Wu
    • Paul ArleoJon HenriGraham HillsJerry WongRobert Wu
    • H01L21/311H01L21/768
    • H01L21/76802H01L21/31116
    • An improved process is described for forming one or more vias through an insulation layer by plasma etching to an underlying metal layer without depositing etch residues, including metal sputtered from the underlying metal layer, onto the sidewalls of the vias, which comprises, in one embodiment, using in the gaseous etchant one or more 3-6 carbon fluorinated hydrocarbons having the formula C.sub.x H.sub.y F.sub.z, wherein x is 3 to 6, y is 0 to 3, and z is 2x-y when the fluorinated hydrocarbon is cyclic and z is 2x-y+2 when the fluorinated hydrocarbon is noncyclic. One or more other fluorine-containing gases may also be used as long as the 3-6 carbon fluorinated hydrocarbons comprise at least 10 volume % of the fluorine-containing gas mixture. The fluorinated hydrocarbon gas or fluorine-containing gas mixture also may be mixed with up to 90 volume % total of one or more inert gases to control the taper of the via walls. At least about 5 sccm of the total gas flow must comprise a 3-6 carbon fluorinated hydrocarbon gas, regardless of the volume % of 3-6 carbon fluorinated hydrocarbon gas in the total gas stream flow. In another embodiment, a controlled amount of one or more nitrogen-containing gases are used with one or more fluorine-containing etchant gas wherein the amount of nitrogen-containing gas ranges from about 1 volume part nitrogen-containing gas per 15 volume parts fluorine-containing gas to about 1 volume part nitrogen-containing gas per 2 volume parts fluorine-containing gas.
    • 描述了一种改进的方法,用于通过等离子体蚀刻到下面的金属层上形成一个或多个通孔,而不将包括从底层金属层溅射的金属的蚀刻残留物沉积到通孔的侧壁上,在一个实施例中包括 在气态蚀刻剂中使用具有式C x H y F z的一种或多种3-6碳氟化烃,其中x为3至6,y为0至3,当氟化烃为环状且z为2x- 当氟化烃为非环状时,y + 2。 也可以使用一种或多种其它含氟气体,只要3-6碳氟化烃包含至少10体积%的含氟气体混合物即可。 氟化烃气体或含氟气体混合物还可以与至多90体积%的一种或多种惰性气体混合以控制通孔壁的锥度。 总气流中至少约5sccm的气体必须包含3-6碳氟化烃气体,而不管总气流中的3-6碳氟化烃气体的体积百分数。 在另一个实施方案中,使用一种或多种含氮气体的受控量的一种或多种含氟气体,其中含氮气体的量为每15体积份含氟气体的约1体积份含氮气体, 每2体积份含氟气体含有约1体积份含氮气体。