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Hexagonal sphere gratings for enhanced light trapping in crystalline silicon solar cells

: Eisenlohr, J.; Benick, J.; Peters, M.; Bläsi, B.; Goldschmidt, J.C.; Hermle, M.

Postprint (PDF; )

Optics Express 22 (2014), No.S1, pp.A111-A119
ISSN: 1094-4087
Journal Article, Electronic Publication
Fraunhofer ISE ()
Solarzellen - Entwicklung und Charakterisierung; Silicium-Photovoltaik; Farbstoff; Organische und Neuartige Solarzellen; Alternative Photovoltaik-Technologien; Oberflächen - Konditionierung; Passivierung; Lichteinfang; Photonenmanagement; Industrielle und neuartige Solarzellenstrukturen; Neuartige Konzepte; trapping; gratings

Enhanced absorption of near infrared light in silicon solar cells is important for achieving high conversion efficiencies while reducing the solar cell’s thickness. Hexagonal gratings on the rear side of solar cells can achieve such absorption enhancement. Our wave optical simulations show photocurrent density gains of up to 3 mA/cm2 for solar cells with a thickness of 40 µm and a planar front side. Hexagonal sphere gratings have been fabricated and optical measurements confirm the predicted absorption enhancement. The measured absorption enhancement corresponds to a photocurrent density gain of 1.04 mA/cm2 for planar wafers with a thickness of 250 µm and 1.49 mA/cm2 for 100 µm.