Dual work function CMOS device
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United States of America Patent
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Feb 22, 2000
Issued Date -
N/A
app pub date -
Dec 14, 1998
filing date -
Aug 29, 1996
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Abstract
A dual work function CMOS device and method for producing the same is disclosed. The method includes: depositing a first layer of a doped material, either n-type or p-type, over a substrate to be doped; defining the areas that are to be oppositely doped; depositing a second layer of an oppositely doped material over the entire surface; and subjecting the entire CMOS device to a high temperature, drive-in anneal. The drive-in anneal accelerates the diffusion of the dopants into the adjacent areas, thereby doping the gate polysilicon and channels with the desired dopants. A nitride barrier layer may be utilized to prevent the second dopant from diffusing through the first layer and into the substrate beneath.
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