[Show abstract][Hide abstract] ABSTRACT: Developments in small R&D KAITM systems have resulted in NREL-confirmed stabilised cell efficiencies of 10.09% for amorphous p-i-n and 11.91% for Micromorph tandem devices. Up-scaling of the processes to 1.4 m2 R&D equipment has so far lead to modules having initial powers of 139.1 W for amorphous silicon and 163 W for Micromorph tandem respectively. At present Oerlikon customers produced in total more than 4.5 million modules (a-Si:H p-i-n or Micromorph tandem) which all together correspond to a cumulative total power of over 450 MWp. Recently Oerlikon Solar introduced its new improved production concept, the so-called ThinFabTM, which brings module production costs down to remarkable 0.5 €/Wp at a capacity of 120 MWp.
[Show abstract][Hide abstract] ABSTRACT: This 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 beyond