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    • 7. 发明授权
    • Semiconductor device and manufacturing method thereof
    • 半导体装置及其制造方法
    • US08043902B2
    • 2011-10-25
    • US12512075
    • 2009-07-30
    • Hideto OhnumaShigeharu MonoeShunpei Yamazaki
    • Hideto OhnumaShigeharu MonoeShunpei Yamazaki
    • H01L21/00
    • H01L27/1214H01L27/124H01L27/1288H01L29/66757H01L29/78624
    • The present invention provides a TFT including at least one LDD region in a self-alignment manner without forming a sidewall spacer and increasing the number of manufacturing steps. A photomask or a reticle provided with an assist pattern that is formed of a diffraction grating pattern or a semi-transmitting film and has a function of reducing light intensity is employed in a photolithography step of forming a gate electrode, an asymmetrical resist pattern having a region with a thick thickness and a region with a thickness thinner than that of the above region on one side is formed, a gate electrode having a stepped portion is formed, and an LDD region is formed in a self-alignment manner by injecting an impurity element to the semiconductor layer through the region with a thin thickness of the gate electrode.
    • 本发明提供一种TFT,其以自对准方式提供至少一个LDD区域,而不形成侧壁间隔物并增加制造步骤的数量。 在形成栅电极的光刻步骤中使用具有由衍射光栅图案或半透射膜形成的辅助图案并具有降低光强度的功能的光掩模或掩模版,具有 形成厚度厚的区域和具有比一面上述区域的厚度薄的区域,形成具有台阶部分的栅电极,并且通过注入杂质以自对准方式形成LDD区域 元件通过具有薄的栅电极厚度的区域到半导体层。