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    • 9. 发明授权
    • Method for forming offset spacers for semiconductor device arrangements
    • 用于形成用于半导体器件布置的偏置间隔物的方法
    • US07767508B2
    • 2010-08-03
    • US11580952
    • 2006-10-16
    • Philip A. FisherLaura A. BrownJohannes GroschopfHuicai Zhong
    • Philip A. FisherLaura A. BrownJohannes GroschopfHuicai Zhong
    • H01L21/338
    • H01L29/4983H01L21/31144H01L29/66659H01L29/66772
    • Methods are provided for the fabrication of abrupt and tunable offset spacers for improved transistor short channel control. The methods include the formation of a gate electrode within a dielectric layer, with only a top portion of the gate electrode exposed. Silicon is added on the top portion of the gate electrode, by selective epitaxial growth, for example. Etching of the dielectric layer is performed with added silicon at the top portion of the gate electrode serving as a silicon mask to prevent etching of the dielectric layer directly underneath the silicon mask, which includes overhangs over the gate electrode sidewalls. The etching creates offset spacers in a production-worthy manner, and can be used to form offset spacers that are asymmetrical in width. By running the methodology in a microloading regime, wider offset spacers may be created on narrower polysilicon gate features, thereby improving Vt roll-off.
    • 提供了用于制造用于改善晶体管短沟道控制的突发和可调偏移间隔物的方法。 这些方法包括在电介质层内形成栅电极,仅露出栅电极的顶部。 例如,通过选择性外延生长将硅添加到栅电极的顶部。 介电层的蚀刻是在栅电极的顶部添加硅作为硅掩模进行的,以防止直接在硅掩模下面的电介质层的蚀刻,该掩模包括在栅电极侧壁上的突出端。 蚀刻以生产价值的方式产生偏移间隔物,并且可以用于形成不对称宽度的偏移间隔物。 通过在微加载方案中运行该方法,可以在较窄的多晶硅栅极特征上产生更宽的偏移间隔物,从而改善Vt滚降。