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First Principles Calculations of Hydrogen Aggregation in Silicon

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Abstract:

We use DFT calculations to investigate the problem of hydrogen aggregation in silicon. We study atomic structures of finite hydrogen aggregates containing four or more hydrogen atoms. Beyond four hydrogen atoms, complexes consisting of Si-H bonds are likely to form, rather than aggregates of H2 molecules, which are the most stable diatomic hydrogen complex. Our calculations show that the basic structural unit of such complexes is a hydrogenated dislocation loop, which is formed spontaneously by a structural transformation of two H∗2 complexes. Hydrogen-induced formation of dislocation loops may account for the experimental observations of dislocation loops in proton-implanted or hydrogen plasma-treated silicon. We indicate the routes leading from H∗2 aggregates and hydrogenated dislocation loops to twodimensional hydrogen-induced platelets. We discuss the effect of hydrogen-catalysed formation of dislocation loops on the plasticity of silicon.

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Periodical:

Defect and Diffusion Forum (Volumes 230-232)

Pages:

81-92

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.230-232.81

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Online since:

November 2004

Authors:

N. Martsinovich, A.L. Rosa, M.I. Heggie, Patrick R. Briddon

Keywords:

Dislocation, Hydrogen Aggregation, Platelets, Silicon

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© 2004 Trans Tech Publications Ltd. All Rights Reserved

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