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    • 6. 发明授权
    • Oxide etch process with high selectivity to nitride suitable for use on surfaces of uneven topography
    • 氧化物蚀刻工艺,对氮化物具有高选择性,适用于不均匀地形的表面
    • US06194325B1
    • 2001-02-27
    • US08552030
    • 1995-12-04
    • Chan Lon YangJeffrey MarksNicolas BrightKenneth S. CollinsDavid GroechelPeter Keswick
    • Chan Lon YangJeffrey MarksNicolas BrightKenneth S. CollinsDavid GroechelPeter Keswick
    • H01L21302
    • H01J37/32871H01J37/321H01L21/31116
    • A plasma etch process is described for the etching of oxide with a high selectivity to nitride, including nitride formed on uneven surfaces of a substrate, e.g., on sidewalls of steps on an integrated circuit structure. The addition of one or more hydrogen-containing gases, preferably one or more hydrofluorocarbon gases, to one or more fluorine-substituted hydrocarbon etch gases and a scavenger for fluorine, in a plasma etch process for etching oxide in preference to nitride, results in a high selectivity to nitride which is preserved regardless of the topography of the nitride portions of the substrate surface. In a preferred embodiment, one or more oxygen-bearing gases are also added to reduce the overall rate of polymer deposition on the chamber surfaces and on the surfaces to be etched, which can otherwise reduce the etch rate and cause excessive polymer deposition on the chamber surfaces. The fluorine scavenger is preferably an electrically grounded silicon electrode associated with the plasma.
    • 描述了用于蚀刻具有对氮化物的高选择性的氧化物的等离子体蚀刻工艺,包括在衬底的不平坦表面上形成的氮化物,例如在集成电路结构上的台阶侧壁上。 在优先于氮化物蚀刻氧化物的等离子体蚀刻工艺中,向一种或多种氟取代烃蚀刻气体和氟清除剂中加入一种或多种含氢气体,优选一种或多种氢氟烃气体,导致 对氮化物的高选择性,与衬底表面的氮化物部分的形貌无关地被保留。 在一个优选的实施方案中,还加入一种或多种含氧气体以降低腔室表面和待蚀刻表面上的聚合物沉积的总体速率,否则可降低蚀刻速率并导致室上过量的聚合物沉积 表面。 氟清除剂优选为与等离子体相关联的电接地硅电极。