Impact of deposition parameters on the material quality of SPC poly-Si thin films using high-rate PECVD of a-Si:H Avishek Kumar, Per Ingemar Widenborg, Goutam Kumar Dalapati, Gomathy Sandhya Subramanian and Armin Gerhard Aberle EPJ Photovolt., 6 (2015) 65303 Published online: 27 May 2015 DOI: 10.1051/epjpv/2015004