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Structural simplicity as a restraint on the structure of amorphous silicon

Cliffe, Matthew J.; Bart�k, Albert P.; Kerber, Rachel N.; Grey, Clare P.; Cs�nyi, G�bor; Goodwin, Andrew L.

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Authors

Albert P. Bart�k

Rachel N. Kerber

Clare P. Grey

G�bor Cs�nyi

Andrew L. Goodwin



Abstract

Understanding the structural origins of the properties of amorphous materials remains one of the most important challenges in structural science. In this study we demonstrate that local 'structural simplicity', embodied by the degree to which atomic environments within a material are similar to each other, is powerful concept for rationalising the structure of canonical amorphous material amorphous silicon (a-Si). We show, by restraining a reverse Monte Carlo refinement against pair distribution function (PDF) data to be simpler, that the simplest model consistent with the PDF is a continuous random network (CRN). A further effect of producing a simple model of a-Si is the generation of a (pseudo)gap in the electronic density of states, suggesting that structural homogeneity drives electronic homogeneity. That this method produces models of a-Si that approach the state-of-the-art without the need for chemically specific restraints (beyond the assumption of homogeneity) suggests that simplicity-based refinement approaches may allow experiment-driven structural modelling techniques to be developed for the wide variety of amorphous semiconductors with strong local order.

Citation

Cliffe, M. J., Bartók, A. P., Kerber, R. N., Grey, C. P., Csányi, G., & Goodwin, A. L. (2017). Structural simplicity as a restraint on the structure of amorphous silicon. Physical Review B, 95(22), Article 224108. https://doi.org/10.1103/physrevb.95.224108

Journal Article Type Article
Acceptance Date Jun 30, 2017
Online Publication Date Jun 30, 2017
Publication Date Jun 30, 2017
Deposit Date Dec 20, 2018
Publicly Available Date Dec 20, 2018
Journal Physical Review B
Print ISSN 2469-9950
Electronic ISSN 2469-9969
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 95
Issue 22
Article Number 224108
DOI https://doi.org/10.1103/physrevb.95.224108
Public URL https://nottingham-repository.worktribe.com/output/1430928
Publisher URL https://journals.aps.org/prb/pdf/10.1103/PhysRevB.95.224108
Additional Information Accepted version deposited on arXiv https://arxiv.org/abs/1609.00668

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