Bailat, JulienFesquet, LucOrhan, Jean-BaptisteWolf, B.Madliger, P.Steinhauser, J.Benagli, StefanoBorrello, D.Castens, LucieMonteduro, G.Marmelo, M.Dehbozorghi, B.Vallat-Sauvain, E.Multone, X.Romang, D.Boucher, J.-F.Meier, J.Kroll, U.Despeisse, MatthieuBugnon, GrégoryBallif, ChristopheMarjanovic, S.Kohnke, G.Borrelli, N.Koch, K.Liu, J.Modavis, R.Thelen, D.Vallon, S.Zakharian, A.Weidman, D.2010-11-182010-11-182010https://infoscience.epfl.ch/handle/20.500.14299/57784This paper addresses three independent approaches to improving the performance of Micromorph® tandem solar cells: 1. Thinner cells for higher throughput in mass-production, 2. Optimum cell design and processes yielding stable efficiencies of 11.5% on as-grown ZnO front contact, and finally 3. The introduction of novel textured glass substrates prepared by Corning Incorporated to improve light-management. As a result of the joint research between Oerlikon Solar- Lab and Corning Incorporated, a Micromorph® tandem cell with no anti-reflection coating demonstrated a stable efficiency of 11.9% as independently measured by NREL. This third result represents a new milestone for thin film silicon solar cell technology which is 8% higher than one year ago. Combinations of these improvements are expected to enable cell efficiencies of 12.5% and beyondtext::conference output::conference proceedings::conference paper