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    • 4. 发明申请
    • SELECTIVE FORMATION OF DIELECTRIC ETCH STOP LAYERS
    • 选择性形成电介质蚀刻层
    • US20090321795A1
    • 2009-12-31
    • US12165515
    • 2008-06-30
    • Sean KingJason Klaus
    • Sean KingJason Klaus
    • H01L21/28H01L29/423
    • H01L21/28052H01L21/76834H01L21/76889H01L29/4933H01L29/7833
    • Methods to selectively form a dielectric etch stop layer over a patterned metal feature. Embodiments include a transistor incorporating such an etch stop layer over a gate electrode. In accordance with certain embodiments of the present invention, a metal is selectively formed on the surface of the gate electrode which is then converted to a silicide or germanicide. In other embodiments, the metal selectively formed on the gate electrode surface enables a catalytic growth of a silicon or germanium mesa over the gate electrode. At least a portion of the silicide, germanicide, silicon mesa or germanium mesa is then oxidized, nitridized, or carbonized to form a dielectric etch stop layer over the gate electrode only.
    • 选择性地在图案化的金属特征上形成介电蚀刻停止层的方法。 实施例包括在栅电极上并入有这种蚀刻停止层的晶体管。 根据本发明的某些实施方案,在栅电极的表面上选择性地形成金属,然后将其转化为硅化物或锗酸盐。 在其他实施例中,选择性地形成在栅电极表面上的金属使得能够在栅电极上催化生长硅或锗台面。 硅化物,锗化硅,硅台面或锗台面的至少一部分然后被氧化,氮化或碳化,以在栅电极上形成电介质蚀刻停止层。