K. Oikawa, S. Ando, N. Ando, H. Horie, Y. Toda, T. Tanaka, S. Hijiya
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p/sup +/ polysilicon gate P-MOSFETs using BCl implantation
Suppressing boron penetration through the gate oxide is necessary to give reliable p/sup +/ polysilicon gate P-MOSFETs which are expected to ease the short channel effect. Fluorine was automatically introduced in the gate oxide by BF/sub 2/ implantation and enhanced B diffusion. It is clearly demonstrated that chlorine does not enhance B diffusion. BCl implantation when fabricating p/sup +/ polysilicon gates makes it possible to fabricate quarter-micron gate length P-MOSFETs with pure oxide 4.5 nm thick.<>
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