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Analyzing experimental boron transient diffusion profiles in Si MOSFETs over a wide temperature range with the process simulator TESIM, we evaluated the related transient diffusion time t/sub E/, enhanced diffusivity D/sub enh/, and maximum transient diffusion concentration C/sub enh/. Our extracted values contradict previously reported values, but it is due to the fact that the former works neglected the ramp-up period. We show that considering the ramp-up period is indispensable for the analysis of transient diffusion. We also developed analytical models for t/sub E/, D/sub enh/, and C/sub enh/, and clarified their dependence on physical parameters implemented in TESIM.