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    • 6. 发明授权
    • Method of forming self-aligned contact structure with locally etched gate conductive layer
    • 用局部蚀刻的栅极导电层形成自对准接触结构的方法
    • US06855610B2
    • 2005-02-15
    • US10330522
    • 2002-12-27
    • Ming-Sheng TungYueh-Chuan Lee
    • Ming-Sheng TungYueh-Chuan Lee
    • H01L21/336H01L21/60H01L23/485
    • H01L21/76897H01L23/485H01L29/66659H01L2924/0002H01L2924/00
    • A method of forming a self-aligned contact structure with a locally etched conductive layer comprises the steps of: preparing a substrate formed with gate structures comprising a first conductive layer, a second conductive layer, and an insulating layer; depositing a photoresist material layer on the substrate; performing a lithographic step with a bit-line contact node photomask or a bit-line contact photomask to expose a portion of the surface of the substrate; etching the exposed second conductive layer with an etchant; removing the remaining photoresist material layer; forming a sidewall spacer on the sidewalls of each gate structure; forming a dielectric layer to cover the substrate; and performing lithographic and etching steps to remove the dielectric layer and to form self-aligned contact structure.
    • 用局部蚀刻的导电层形成自对准接触结构的方法包括以下步骤:制备由栅极结构形成的衬底,该栅极结构包括第一导电层,第二导电层和绝缘层; 在基板上沉积光致抗蚀剂材料层; 用位线接触节点光掩模或位线接触光掩模执行光刻步骤以暴露所述衬底表面的一部分; 用蚀刻剂蚀刻暴露的第二导电层; 去除剩余的光致抗蚀剂材料层; 在每个栅极结构的侧壁上形成侧壁间隔物; 形成介电层以覆盖基板; 并执行光刻和蚀刻步骤以去除介电层并形成自对准接触结构。