Light-induced metastability in pure and hydrogenated amorphous siliconD. R. Queen, X. Liu, J. Karel, Q. Wang, R. S. Crandall, T. H. Metcalf and F. HellmanEPL, 112 2 (2015) 26001DOI: https://doi.org/10.1209/0295-5075/112/26001