Method for multiple spacer width control
    3.
    发明授权
    Method for multiple spacer width control 有权
    多间隔宽度控制方法

    公开(公告)号:US07176137B2

    公开(公告)日:2007-02-13

    申请号:US10435009

    申请日:2003-05-09

    IPC分类号: H01L21/302

    CPC分类号: H01L29/6656 H01L21/823468

    摘要: A method of forming pluralities of gate sidewall spacers each plurality comprising different associated gate sidewall spacer widths including providing a first plurality of gate structures; blanket depositing a first dielectric layer over the first plurality of gate structures; blanket depositing a second dielectric layer over the first dielectric layer; etching back through a thickness of the first and second dielectric layers; blanket depositing a first photoresist layer to cover the first plurality and patterning to selectively expose at least a second plurality of gate structures; isotropically etching the at least a second plurality of gate structures for a predetermined time period to selectively etch away a predetermined portion of the first dielectric layer; and, selectively etching away the second dielectric layer to leave gate structures comprising a plurality of associated sidewall spacer widths.

    摘要翻译: 形成多个栅极侧壁间隔物的方法,每个栅极侧壁间隔件包括不同的相关栅极侧壁间隔物宽度,包括提供第一多个栅极结构; 在第一多个栅极结构上覆盖沉积第一介电层; 在第一介电层上铺设第二介电层; 通过第一和第二介电层的厚度回蚀; 覆盖沉积第一光致抗蚀剂层以覆盖第一多个并且图案化以选择性地暴露至少第二多个栅极结构; 对所述至少第二多个栅极结构进行各向同性蚀刻预定的时间段以选择性地蚀刻掉所述第一介电层的预定部分; 并且选择性地蚀刻掉第二介电层以留下包括多个相关联的侧壁间隔物宽度的栅极结构。