Grain boundary assisted photocurrent collection in thin film solar cells Susanna Harndt, Christian A. Kaufmann, Martha C. Lux-Steiner, Reiner Klenk and Reiner Nürnberg EPJ Photovolt., 6 (2015) 60101 Published online: 15 June 2015 DOI: 10.1051/epjpv/2015006