Post metal gate VT adjust etch clean
    1.
    发明授权
    Post metal gate VT adjust etch clean 有权
    后金属栅VT调整蚀刻清洁

    公开(公告)号:US07785957B2

    公开(公告)日:2010-08-31

    申请号:US12344422

    申请日:2008-12-26

    IPC分类号: H01L21/00

    摘要: A method for fabricating a CMOS integrated circuit (IC) includes providing a substrate having a semiconductor surface, wherein the semiconductor surface has PMOS regions for PMOS devices and NMOS regions for NMOS devices. A gate dielectric layer is formed on the semiconductor surface followed by forming at least a first metal including layer on the gate dielectric layer. A polysilicon or amorphous silicon layer is formed on the first metal including layer to form an intermediate gate electrode stack. A masking pattern is formed on the intermediate gate electrode stack. The polysilicon or amorphous silicon layer is dry etched using the masking pattern to define a patterned intermediate gate electrode stack over the NMOS or PMOS regions, wherein the dry etching stops on a portion of the first metal comprising layer. The masking pattern is removed using a first post etch clean for stripping the masking pattern. A multi-step solution cleaning sequence is used after the removing step and includes a first wet clean including sulfuric acid and a fluoride, and a second wet clean after the first wet clean including a fluoride. Fabrication of the IC is then completed.

    摘要翻译: 一种制造CMOS集成电路(IC)的方法包括提供具有半导体表面的衬底,其中半导体表面具有用于PMOS器件的PMOS区域和用于NMOS器件的NMOS区域。 在半导体表面上形成栅极电介质层,然后在栅极介电层上至少形成第一金属包层。 在第一金属包含层上形成多晶硅或非晶硅层以形成中间栅电极堆叠。 在中间栅电极堆叠上形成掩模图案。 使用掩模图案干蚀刻多晶硅或非晶硅层,以在NMOS或PMOS区域上限定图案化的中间栅电极堆叠,其中干蚀刻停止在第一金属层的一部分上。 使用第一后蚀刻清洁来去除掩模图案以剥离掩模图案。 在去除步骤之后使用多步骤溶液清洗顺序,并且包括包括硫酸和氟化物在内的第一次湿清洗,以及在第一次湿清洁之后包括氟化物的第二次湿清洁。 然后完成IC的制造。