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    • 3. 发明授权
    • Method for fabricating a concave bottom oxide in a trench
    • 在沟槽中制造凹底氧化物的方法
    • US06265269B1
    • 2001-07-24
    • US09369266
    • 1999-08-06
    • Chien-Hung ChenChih-Ta WuChing-Shun LinJuinn-Sheng Chen
    • Chien-Hung ChenChih-Ta WuChing-Shun LinJuinn-Sheng Chen
    • H01L21336
    • H01L29/42368H01L29/7813
    • A method for forming a concave bottom oxide layer in a trench, comprising: providing a semiconductor substrate; forming a pad oxide layer on the semiconductor substrate; forming a silicon nitride layer on the pad oxide layer; etching the silicon nitride layer, the pad oxide layer and the semiconductor substrate to form the trench in the semiconductor substrate; depositing a silicon oxide layer to refill into the trench and cover on the silicon nitride layer, wherein the silicon oxide layer has overhang portions at corners of the trench; anisotropically etching the silicon oxide layer to form a concave bottom oxide layer in the trench; etching the silicon oxide layer to remove the silicon oxide layer on the silicon nitride layer and the sidewalls of the trench; removing the silicon nitride layer and the pad oxide layer.
    • 一种在沟槽中形成凹底部氧化物层的方法,包括:提供半导体衬底; 在所述半导体衬底上形成衬垫氧化物层; 在所述焊盘氧化物层上形成氮化硅层; 蚀刻氮化硅层,焊盘氧化物层和半导体衬底,以在半导体衬底中形成沟槽; 沉积硅氧化物层以重新填充到沟槽中并覆盖在氮化硅层上,其中氧化硅层在沟槽的拐角处具有突出部分; 各向异性地蚀刻氧化硅层以在沟槽中形成凹的底部氧化物层; 蚀刻氧化硅层以除去氮化硅层和沟槽的侧壁上的氧化硅层; 去除氮化硅层和衬垫氧化物层。