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Hydrogen Equilibration and Metastability in Amorphous Silicon

Published online by Cambridge University Press:  17 March 2011

Howard M. Branz and
S.B. Zhang
Howard M. Branz
Affiliation:
National Renewable Energy Laboratory Golden, CO 80401, U.S.A
S.B. Zhang
Affiliation:
National Renewable Energy Laboratory Golden, CO 80401, U.S.A
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Abstract

We review evidence for the vital role of H in metastability and defect equilibration in hydrogenated amorphous silicon. H pairs act both as an H reservoir that equilibrates with DB's and dopants and as the metastable H state of light-induced metastability. With ab initio pseudopotential theory, we calculate energies and configurations for two novel H pairing sites associated with small hydrogenated vacancies. We describe microscopic models of equilibration and metastability based on our calculations.

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