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    • 95. 发明申请
    • Method of forming a locally strained transistor
    • 形成局部应变晶体管的方法
    • US20060246672A1
    • 2006-11-02
    • US11119522
    • 2005-04-29
    • Chien-Hao ChenDonald ChaoTze-Liang Lee
    • Chien-Hao ChenDonald ChaoTze-Liang Lee
    • H01L21/336H01L29/94H01L27/108H01L29/76H01L31/119
    • H01L29/78H01L29/7843
    • A preferred embodiment of the invention provides a semiconductor fabrication method. An embodiment comprises forming a MOS device having sidewall spacers. A highly stressed layer is deposited over the device. The stress is selectively adjusted in that portion of the layer over the gate electrode and the sidewall spacers. Preferably, the stress layer over the gate electrode and over the sidewall spacers is adjusted from a first stress to a second stress, wherein the first stress is one of tensile and compressive, and the second stress is the other of tensile and compressive. Preferred embodiments selectively induce a suitable stress within PMOS and NMOS channel regions for improving their respective carrier mobility. Still other embodiments of the invention comprise a field effect transistor (FET) having a overlying stressed layer, the stressed layer being comprised of different stress regions.
    • 本发明的优选实施例提供半导体制造方法。 一个实施例包括形成具有侧壁间隔物的MOS器件。 高应力层沉积在器件上。 在栅极电极和侧壁间隔物上的层的该部分中选择性地调节应力。 优选地,栅极上方和侧壁间隔物上的应力层从第一应力调整到第二应力,其中第一应力是拉伸和压缩之一,第二应力是拉伸和压缩中的另一个。 优选实施例在PMOS和NMOS沟道区域内选择性地诱发适当的应力,以改善它们各自的载流子迁移率。 本发明的其它实施例包括具有上覆应力层的场效应晶体管(FET),所述应力层由不同的应力区域组成。