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    • 3. 发明申请
    • Method to lower work function of gate electrode through Ge implantation
    • 通过Ge注入来降低栅电极的功函数的方法
    • US20050095773A1
    • 2005-05-05
    • US10701963
    • 2003-11-05
    • Tze Ho ChanMousumi BhatJeffrey Chee
    • Tze Ho ChanMousumi BhatJeffrey Chee
    • H01L21/3215H01L21/8238H01R4/64H01L21/302H01L21/461H01R4/60
    • H01L21/823842H01L21/32155H01L21/82385
    • A method for forming selective P type and N type gates is described. A gate oxide layer is grown overlying a semiconductor substrate. A polysilicon layer is deposited overlying the gate oxide layer. Germanium ions are implanted into a portion of the polysilicon layer not covered by a mask to form a polysilicon-germanium layer. The polysilicon layer and the polysilicon-germanium layer are patterned to form NMOS polysilicon gates and PMOS polysilicon-germanium gates. In an alternative, nitrogen ions are implanted into the polysilicon-germanium layer and the gates are annealed after patterning to redistribute the germanium ions throughout the polysilicon-germanium layer. In a second alternative, germanium ions are implanted into a first thin polysilicon layer, then a second polysilicon layer is deposited to achieve the total polysilicon layer thickness before patterning the gates.
    • 描述了形成选择性P型和N型栅极的方法。 生长在半导体衬底上的栅氧化层。 沉积在栅极氧化物层上的多晶硅层。 将锗离子注入到未被掩模覆盖的多晶硅层的一部分中以形成多晶硅 - 锗层。 图案化多晶硅层和多晶硅 - 锗层以形成NMOS多晶硅栅极和PMOS多晶硅 - 锗栅极。 替代地,将氮离子注入到多晶硅 - 锗层中,并且在图案化之后对栅极进行退火以将锗离子重新分布在整个多晶硅 - 锗层中。 在第二替代方案中,将锗离子注入到第一薄多晶硅层中,然后沉积第二多晶硅层以在栅极图案化之前实现总多晶硅层厚度。