Methods and systems to mitigate etch stop clipping for shallow trench isolation fabrication
    3.
    发明授权
    Methods and systems to mitigate etch stop clipping for shallow trench isolation fabrication 有权
    用于减轻浅沟槽隔离制造的蚀刻停止限幅的方法和系统

    公开(公告)号:US07625807B2

    公开(公告)日:2009-12-01

    申请号:US11678107

    申请日:2007-02-23

    IPC分类号: H01L21/76 H01L21/336

    摘要: The present invention facilitates semiconductor fabrication by maintaining shape and density of an etch stop layer (206) during trench fill operations. The shape and density of the etch stop layer (206) is maintained by forming a protective alloy liner layer (310) on the etch stop layer (206) prior to trench fill operations. The protective alloy liner (310) is comprised of an alloy that is resistant to materials employed in the trench fill operations. As a result, clipping and/or damage to the etch stop layer (206) is mitigated thereby facilitating a subsequent planarization process that employs the etch stop layer (206). Additionally, selection of thickness and composition (1706) of the formed protective alloy (310) yields a stress amount and type (1704) that is applied to channel regions of unformed transistor devices, ultimately providing for an improvement in channel mobility.

    摘要翻译: 本发明通过在沟槽填充操作期间保持蚀刻停止层(206)的形状和密度来促进半导体制造。 通过在沟槽填充操作之前在蚀刻停止层(206)上形成保护合金衬垫层(310)来保持蚀刻停止层(206)的形状和密度。 保护合金衬套(310)由对沟槽填充操作中使用的材料具有耐受性的合金构成。 结果,减轻了对蚀刻停止层(206)的削波和/或损伤,从而有利于采用蚀刻停止层(206)的随后的平坦化工艺。 此外,形成的保护合金(310)的厚度和组成(1706)的选择产生施加到未成形晶体管器件的沟道区域的应力量和类型(1704),最终提供了沟道迁移率的改善。