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Title: Light-induced metastability in pure and hydrogenated amorphous silicon

Abstract

Light soaking is found to increase the specific heat C and internal friction Q-1 of pure (a-Si) and hydrogenated (a-Si:H) amorphous silicon. At the lowest temperatures, the increases in C and Q-1 are consistent with an increased density of two-level systems (TLS). The light-induced increase in C persists to room temperature. Neither the sound velocity nor shear modulus change with light soaking indicating that the Debye specific heat is unchanged which suggests that light soaking creates localized vibrational modes in addition to TLS. The increase can be reversibly added and removed by light soaking and annealing, respectively, suggesting that it is related to the Staebler-Wronski effect (SWE), even in a-Si without H, and involves a reversible nanoscale structural rearrangement that is facilitated by, but does not require, H to occur.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
National Science Foundation (NSF)
OSTI Identifier:
1329998
Report Number(s):
NREL/JA-5200-67330
Journal ID: ISSN 0295-5075
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Journal Article
Journal Name:
Europhysics Letters
Additional Journal Information:
Journal Volume: 112; Journal Issue: 2; Journal ID: ISSN 0295-5075
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; amorphous semiconductors; metastability; light soaking

Citation Formats

Queen, D. R., Liu, X., Karel, J., Wang, Q., Crandall, R. S., Metcalf, T. H., and Hellman, F. Light-induced metastability in pure and hydrogenated amorphous silicon. United States: N. p., 2015. Web. doi:10.1209/0295-5075/112/26001.
Queen, D. R., Liu, X., Karel, J., Wang, Q., Crandall, R. S., Metcalf, T. H., & Hellman, F. Light-induced metastability in pure and hydrogenated amorphous silicon. United States. doi:10.1209/0295-5075/112/26001.
Queen, D. R., Liu, X., Karel, J., Wang, Q., Crandall, R. S., Metcalf, T. H., and Hellman, F. Thu . "Light-induced metastability in pure and hydrogenated amorphous silicon". United States. doi:10.1209/0295-5075/112/26001.
@article{osti_1329998,
title = {Light-induced metastability in pure and hydrogenated amorphous silicon},
author = {Queen, D. R. and Liu, X. and Karel, J. and Wang, Q. and Crandall, R. S. and Metcalf, T. H. and Hellman, F.},
abstractNote = {Light soaking is found to increase the specific heat C and internal friction Q-1 of pure (a-Si) and hydrogenated (a-Si:H) amorphous silicon. At the lowest temperatures, the increases in C and Q-1 are consistent with an increased density of two-level systems (TLS). The light-induced increase in C persists to room temperature. Neither the sound velocity nor shear modulus change with light soaking indicating that the Debye specific heat is unchanged which suggests that light soaking creates localized vibrational modes in addition to TLS. The increase can be reversibly added and removed by light soaking and annealing, respectively, suggesting that it is related to the Staebler-Wronski effect (SWE), even in a-Si without H, and involves a reversible nanoscale structural rearrangement that is facilitated by, but does not require, H to occur.},
doi = {10.1209/0295-5075/112/26001},
journal = {Europhysics Letters},
issn = {0295-5075},
number = 2,
volume = 112,
place = {United States},
year = {2015},
month = {10}
}