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Honeycomb structure on multicrystalline silicon Al-BSF solar cell with 17.8% efficiency

: Volk, A.-K.; Tucher, N.; Seiffe, J.; Hauser, H.; Zimmer, M.; Bläsi, B.; Hofmann, M.; Rentsch, J.


IEEE Journal of Photovoltaics 5 (2015), No.4, pp.1027-1033
ISSN: 2156-3381
Journal Article
Fraunhofer ISE ()
PV Produktionstechnologie und Qualitätssicherung; Silicium-Photovoltaik; Oberflächen - Konditionierung; Passivierung; Lichteinfang; Pilotherstellung von industrienahen Solarzellen

In this paper, large-area honeycomb (HC) texturing of multi-crystalline Si substrates with a newly developed process chain based on roller nanoimprint lithography and inline-capable plasma etching is demonstrated. The realized HC-textures show optical properties superior to random pyramids on c-Si, while the surface passivation quality is comparable. First, results on 156 × 156 mm2 multi-crystalline Si solar cells with an aluminum back-surface field show an efficiency of η = 17.8% compared with η = 17.3% on isotextured reference samples. This efficiency gain of 0.5% results from an increase in Jsc of up to 1.3 mA/cm2, which underlines the high optical and electrical quality of the texture. On a smaller area (50 × 50 mm2), the gain in Jsc of HC-textured cells compared with isotextured references was even higher with up to 2.5 mA/cm2.