A model of reduction of oxidation-enhanced diffusion in heavily doped Si layers |
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Authors: | O. V. Aleksandrov N. N. Afonin |
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Affiliation: | (1) St. Petersburg State University of Electrical Engineering, St. Petersburg, 197396, Russia;(2) Voronezh State Pedagogical University, Voronezh, 394043, Russia |
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Abstract: | A model of reduction of oxidation-enhanced diffusion (OED) in heavily doped Si layers via bulk recombination of self-interstitials at centers associated with the dopant is suggested. The allowance made for the recombination of excess self-interstitials, which are generated upon thermal oxidation, allows one to describe the dependence of OED reduction on the doping level. The experimental data on the OED of B and P impurities in uniformly doped Si layers are analyzed. From the analysis, the recombination-rate constants are determined and capture radii are estimated for various variants of interaction of excess self-interstitials with impurity atoms and impurity-vacancy pairs. |
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