Highly transparent front electrodes with metal fingers for p-i-n thin-film silicon solar cells Etienne Moulin, Thomas Christian Mathias Müller, Marek Warzecha, Andre Hoffmann, Ulrich Wilhelm Paetzold and Urs Aeberhard EPJ Photovolt., 6 (2015) 60501 Published online: 09 March 2015 DOI: 10.1051/epjpv/2015001