Journal
IEEE JOURNAL OF PHOTOVOLTAICS
Volume 3, Issue 2, Pages 656-661Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOTOV.2012.2228302
Keywords
Laser; photovoltaic cells; silicon; surface texture
Funding
- German State of Lower Saxony
- German Federal Ministry for the Environment, Nature Conservation, and Nuclear Safety
- SolarWinS [0325270E]
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We implement direct laser texturing (DiLaT) into small-area (2 x 2 cm(2)) passivated emitter and rear solar cells (PERC). On monocrystalline float-zone silicon (FZ-Si) wafers, we achieve an independently confirmed energy conversion efficiency of 19.9% that demonstrates the applicability of DiLaT to high-efficiency solar cells. Applying our DiLaT process to block-cast multicrystalline silicon (mc-Si) wafers, we achieve short-circuit current densities J(sc) up to 39.3 mA/cm(2) and efficiencies up to 17.9%. The reduced J(sc) value of our mc-Si solar cells compared with the FZ-Si cells is shown to be predominantly due to increased recombination in the bulk and/or the rear.
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