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    • 8. 发明授权
    • Methods of forming semiconductor devices having gates with different work functions using selective injection of diffusion inhibiting materials
    • 使用选择性注入扩散抑制材料形成具有不同功函数的栅极的半导体器件的方法
    • US08293599B2
    • 2012-10-23
    • US12540090
    • 2009-08-12
    • Hoon-joo NaYu-gyun ShinHong-bae ParkHag-ju ChoSug-hun HongSang-jin HyunHyung-seok Hong
    • Hoon-joo NaYu-gyun ShinHong-bae ParkHag-ju ChoSug-hun HongSang-jin HyunHyung-seok Hong
    • H01L21/8238
    • H01L21/823857H01L21/823842
    • A semiconductor device that has a dual gate having different work functions is simply formed by using a selective nitridation. A gate insulating layer is formed on a semiconductor substrate including a first region and a second region, on which devices having different threshold voltages are to be formed. A diffusion inhibiting material is selectively injected into the gate insulating layer in one of the first region and the second region. A diffusion layer is formed on the gate insulating layer. A work function controlling material is directly diffused from the diffusion layer to the gate insulating layer using a heat treatment, wherein the gate insulting layer is self-aligned capped with the selectively injected diffusion inhibiting material so that the work function controlling material is diffused into the other of the first region and the second region. The gate insulating layer is entirely exposed by removing the diffusion layer. A gate electrode layer is formed on the exposed gate insulating layer. A first gate and a second gate having different work functions are respectively formed in the first region and the second region by etching the gate electrode layer and the gate insulating layer.
    • 具有不同工作功能的双栅极的半导体器件通过使用选择性氮化简单地形成。 在包括第一区域和第二区域的半导体衬底上形成栅极绝缘层,在其上形成具有不同阈值电压的器件。 扩散抑制材料被选择性地注入到第一区域和第二区域之一中的栅极绝缘层中。 在栅极绝缘层上形成扩散层。 工作功能控制材料通过热处理从扩散层直接扩散到栅极绝缘层,其中栅极绝缘层由选择性注入的扩散抑制材料自对准封盖,使得功函数控制材料扩散到 第一个地区和第二个地区的其他地区。 通过去除扩散层,完全暴露栅极绝缘层。 在暴露的栅极绝缘层上形成栅极电极层。 通过蚀刻栅极电极层和栅极绝缘层,分别在第一区域和第二区域中形成具有不同功函数的第一栅极和第二栅极。