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Understanding process-related efficiency variations in mc-Si PERC cells

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By Sven Wasmer, Johannes Greulich, Hannes Höffler, Nico Wöhrle & Stefan Rein, Fraunhofer ISE

This paper introduces and explains a simulation-assisted approach for determining and ranking the most influential causes of variations in experimentally obtained solar cell efficiencies, using the example of an industrially feasible multicrystalline silicon (mc-Si) passivated emitter and rear cell (PERC) process. The approach presented is especially helpful for ramping up PERC production; however, since it is basically transferable to any solar cell concept, it can also be applied to optimize established production lines.

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This issue of Photovoltaics International features an industry-first analysis of the rate at which manufacturing expansion announcements over the past two years are being turned into real nameplate production capacity. In another special report Finlay Colville characterises the nature of the current PV capex cycle as compared to the last. Whereas the previous spending cycle was notable for being “frantic”, the latest one has so far been more measured, with manufacturers focusing on strengthening their positions in specific segments of the value chain. Other highlights in this issue include a paper from researchers at the Solar Energy Research Institute of Singapore (SERIS) exploring cell-to-module losses.

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