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    • 9. 发明授权
    • Semiconductor device with strain-inducing regions and method thereof
    • 具有应变诱导区域的半导体器件及其方法
    • US08524563B2
    • 2013-09-03
    • US13345457
    • 2012-01-06
    • Stefan FlachowskyJan HoentschelThilo Scheiper
    • Stefan FlachowskyJan HoentschelThilo Scheiper
    • H01L21/336
    • H01L29/78H01L21/26586H01L29/1608H01L29/165H01L29/66636H01L29/66659H01L29/7848
    • Improved MOSFET devices are obtained by incorporating strain inducing source-drain regions whose closest facing “nose” portions underlying the gate are located at different depths from the device surface. In a preferred embodiment, the spaced-apart source-drain regions may laterally overlap. This close proximity increases the favorable impact of the strain inducing source-drain regions on the carrier mobility in an induced channel region between the source and drain. The source-drain regions are formed by epitaxially refilling asymmetric cavities etched from both sides of the gate. Cavity asymmetry is obtained by forming an initial cavity proximate only one sidewall of the gate and then etching the final spaced-apart source-drain cavities proximate both sidewalls of the gate along predetermined crystallographic directions. The finished cavities having different depths and nose regions at different heights extending toward each other under the gate, are epitaxially refilled with the strain inducing semiconductor material for the source-drain regions.
    • 通过引入应变诱导源极 - 漏极区域获得改进的MOSFET器件,其中栅极下方的最接近的“鼻”部分位于与器件表面不同的深度处。 在优选实施例中,间隔开的源极 - 漏极区域可以横向重叠。 这种接近度增加了应变诱导源 - 漏区对源极和漏极之间的感应沟道区域中的载流子迁移率的有利影响。 源极 - 漏极区域通过外部重新填充从栅极的两侧蚀刻的不对称空洞形成。 通过在栅极的仅一个侧壁附近形成初始腔,然后沿着预定的晶体方向蚀刻靠近栅极的两个侧壁的最后的间隔开的源极 - 漏极空腔来获得腔不对称性。 具有不同高度的不同深度和鼻部区域的完成的腔体在栅极下彼此延伸,被外源重新填充用于源极 - 漏极区域的应变诱导半导体材料。