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    • 2. 发明授权
    • Patternless technique for building self-aligned floating gates
    • 用于构建自对准浮动门的无模式技术
    • US5922619A
    • 1999-07-13
    • US942503
    • 1997-10-02
    • David L. Larkin
    • David L. Larkin
    • H01L21/336H01L20/21
    • H01L29/66825
    • A patternless, self-aligning method of forming a floating gate on a silicon wafer having a plurality of raised field oxide isolation structures. The method of the present invention includes depositing a polysilicon layer onto the silicon wafer and the raised field oxide isolation structures, depositing a polysilicon etch masking layer onto the polysilicon layer, and planarizing the polysilicon etch masking layer. The polysilicon etch masking layer is then etched to expose the polysilicon layer over the raised field oxide isolation structures. The exposed polysilicon layer is then etched to remove the polysilicon layer over the raised field oxide isolation structures. The remaining polysilicon etch masking layer is then removed, leaving a plurality of polysilicon regions covering the silicon wafer between the field oxide isolation structures.
    • 在具有多个凸起场氧化物隔离结构的硅晶片上形成浮栅的无图案自对准方法。 本发明的方法包括将多晶硅层沉积到硅晶片和凸起的场氧化物隔离结构上,在多晶硅层上沉积多晶硅蚀刻掩模层,以及平坦化多晶硅蚀刻掩模层。 然后蚀刻多晶硅蚀刻掩模层以在凸起​​的场氧化物隔离结构上暴露多晶硅层。 然后蚀刻暴露的多晶硅层以在凸起​​的场氧化物隔离结构上去除多晶硅层。 然后去除剩余的多晶硅蚀刻掩模层,留下在场氧化物隔离结构之间覆盖硅晶片的多个多晶硅区域。