Thin metal layer as transparent electrode in n-i-p amorphous silicon solar cells Martin Theuring, Stefan Geissendörfer, Martin Vehse, Karsten von Maydell and Carsten Agert EPJ Photovolt., 5 (2014) 55205 Published online: 07 July 2014 DOI: 10.1051/epjpv/2014004