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    • 5. 发明申请
    • SIGE CHANNEL EPITAXIAL DEVELOPMENT FOR HIGH-K PFET MANUFACTURABILITY
    • 用于高K PFET制造商的信号通道外延开发
    • US20090181507A1
    • 2009-07-16
    • US12014815
    • 2008-01-16
    • Michael P. ChudzikDominic J. SchepisLinda Black
    • Michael P. ChudzikDominic J. SchepisLinda Black
    • H01L21/8234
    • H01L21/823807H01L21/76229H01L21/823842H01L21/823878
    • A method for growing an epitaxial layer patterns a mask over a substrate. The mask protects first areas (N-type areas) of the substrate where N-type field effect transistors (NFETs) are to be formed and exposes second areas (P-type areas) of the substrate where P-type field effect transistors (PFETs) are to be formed. Using the mask, the method can then epitaxially grow the Silicon Germanium layer only on the P-type areas. The mask is then removed and shallow trench isolation (STI) trenches are patterned (using a different mask) in the N-type areas and in the P-type areas. This STI patterning process positions the STI trenches so as to remove edges of the epitaxial layer. The trenches are then filled with an isolation material. Finally, the NFETs are formed to have first metal gates and the PFETs are formed to have second metal gates that are different than the first metal gates. The first metal gates have a different work function than the second metal gates.
    • 用于生长外延层的方法在衬底上图案掩模。 掩模保护要形成N型场效应晶体管(NFET)的衬底的第一区域(N型区域),并露出衬底的第二区域(P型区域),其中P型场效应晶体管(PFET) )将被形成。 使用掩模,该方法可以仅在P型区域上外延生长硅锗层。 然后去除掩模,并在N型区域和P型区域中对浅沟槽隔离(STI)沟槽进行图案化(使用不同的掩模)。 该STI图案化工艺定位STI沟槽以便去除外延层的边缘。 然后用隔离材料填充沟槽。 最后,NFET形成为具有第一金属栅极,并且PFET形成为具有与第一金属栅极不同的第二金属栅极。 第一金属门具有与第二金属栅极不同的功函数。