Tri-gate patterning using dual layer gate stack
    84.
    发明申请
    Tri-gate patterning using dual layer gate stack 有权
    使用双层栅极堆叠的三栅极图案化

    公开(公告)号:US20090170267A1

    公开(公告)日:2009-07-02

    申请号:US12006047

    申请日:2007-12-28

    IPC分类号: H01L21/336

    摘要: In general, in one aspect, a method includes forming an n-diffusion fin and a p-diffusion fin in a semiconductor substrate. A high dielectric constant layer is formed over the substrate. A first work function metal layer is created over the n-diffusion fin and a second work function metal layer, thicker than the first, is created over the n-diffusion fin. A silicon germanium layer is formed over the first and second work function metal layers. A ploysilicon layer is formed over the silicon germanium layer and is polished. The ploysilicon layer over the first work function metal layer is thicker than the ploysilicon layer over the second work function metal layer. A hard mask is patterned and used to etch the ploysilicon layer and the silicon germanium layer to create gate stacks. The etch rate of the silicon germanium layer is faster over the first work function metal layer.

    摘要翻译: 通常,在一个方面,一种方法包括在半导体衬底中形成n扩散鳍和p扩散鳍。 在衬底上形成高介电常数层。 在n扩散翅片上形成第一功函数金属层,并在n扩散鳍片上形成比第一功函数金属层厚的第二功函数金属层。 在第一和第二功函数金属层上形成硅锗层。 在硅锗层上方形成硅层,并进行抛光。 第一功函数金属层上的多晶硅层比第二功函数金属层上的多晶硅层厚。 硬掩模被图案化并用于蚀刻合金层和硅锗层以产生栅极堆叠。 硅锗层的蚀刻速率比第一功函数金属层更快。