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Mass Producible PERC Cells With Over 20% Conversion Efficiency

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Abstract

Recent revitalization of passivated emitter and rear cell (PERC) concept in the silicon PV industry has resulted in solar energy conversion efficiency higher than 20% being reached on p-type solar grade single-crystalline silicon (mono-Si) wafers during the past few years, thanks to the technological advance in utilizing aluminum oxide for silicon surface passivation. The industry version of PERC cells can be mass produced nowadays on the existing conventional BSF cell manufacturing platform with moderate retrofitting using p-type Si wafers grown by Czochralski method without special quality requirement. Moreover, by applying the same PERC approach in combination with some light trapping technique to the cells using polycrystalline silicon (multi-Si) wafers produced by seeded directional solidification method, an averaged 20% conversion efficiency for multi-Si solar cells can also be practically achieved.

© 2015 Optical Society of America

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