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Nanotextured multicrystalline Al-BSF solar cells reaching 18% conversion efficiency using industrially viable solar cell processes

: Bishal, K.; Mannan, A.; Freund, T.; Clochard, L.; Duffy, E.; Hofmann, M.; Rentsch, J.; Preu, R.


Physica status solidi. Rapid research letters 9 (2015), No.8, pp.448-452
ISSN: 1862-6254
ISSN: 1862-6270
Journal Article
Fraunhofer ISE ()
PV Produktionstechnologie und Qualitätssicherung; Silicium-Photovoltaik; Oberflächen: Konditionierung; Passivierung; Lichteinfang; nanotexture; etching; silicon; reflection; Multicrystalline

We report recent achievements in adapting industrially used solar cell processes on nanotextured surfaces. Nanostructures were etched into c-Si surfaces by dry exothermic plasma-less reaction of F species with Si in atmospheric pressure conditions and then modified using a short post-etching process. Nanotextured multicrystalline wafers are used to prepare Al-BSF solar cells using industrially feasible solar cell processing steps. In comparison to the reference acidic textured solar cells, the nanostructured cells showed gain in short circuit current (Jsc) of up to 0.8 mA/cm2 and absolute gain in conversion efficiency of up to 0.3%. The best nanotextured solar cell was independently certified to reach the conversion efficiency of 18.0%