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Erschienen in:
25.01.2017
Pre-wetted treatment for optimized multicrystalline Si wafer texturing and its solar cell efficiency improvement
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 9/2017
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Abstract
We report a simple way to optimize texturing of multi-crystalline Si (mc-Si) wafer by pre-wetted surface in the wet etching. In the range of 300–1200 nm, a better texturing surface was achieved with average reflectivity <20%. We could explain the low reflectivity from surface morphology difference of SEM pictures. Further, standard solar cells have been finished. Obvious improvement in short circuit current (>40 mA) and efficiency (0.1% absolute) has been achieved compared with control cell without deterioration of other performance parameters (such as open circuit voltage and fill factor). Internal quantum efficiency measurement also proves the lower front surface recombination velocity of pre-wetted based solar cell. We believe that the improved wetting surface property of multi-crystalline Si prior to etching is important for optimizing texturing process, and pre-wetted treatment is easy integrated for industrial mass production.