Based on a network defect model for the diffusion of B in SiO/sub 2/, we propose that B diffuses via a peroxy linkage defect (pld) whose concentration in the oxide changes under different processing conditions. We show that as N is added to the gate oxide (nitridation), N atoms compete with B atoms for activation through the diffusion-defect sites. The model predicts that nitridation is ineffective in stopping B penetration when BF/sub 2/ implants dope the polysilicon gate, as well as for the case of very thin gate dielectrics with B-implanted gates.
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Richard B. Fair (1997) studied this question.
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