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Integrating diffractive rear side structures for light trapping into crystalline silicon solar cells

: Eisenlohr, J.; Hauser, H.; Benick, J.; Mellor, A.; Bläsi, B.; Goldschmidt, J.; Hermle, M.

Volltext urn:nbn:de:0011-n-2669198 (855 KByte PDF)
MD5 Fingerprint: 1ddc9bed34553e30f8b7c16dae6ee0a1
Erstellt am: 30.11.2013

Mine, A. ; European Commission:
28th European Photovoltaic Solar Energy Conference and Exhibition, EU PVSEC 2013. Proceedings. DVD-ROM : 30 September to 04 October 2013, Paris, France
München: WIP-Renewable Energies, 2013
ISBN: 3-936338-33-7
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <28, 2013, Paris>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer ISE ()
Solarzellen - Entwicklung und Charakterisierung; Silicium-Photovoltaik; Farbstoff; Organische und Neuartige Solarzellen; Oberflächen - Konditionierung; Passivierung; Lichteinfang; Photonenmanagement; Management; Grating; Trapping

Diffractive rear side light trapping structures significantly enhance the path length for near infrared light. We present a way of integrating such diffractive rear side structures into crystalline silicon solar cells. Two types of diffractive structures, hexagonal sphere gratings and binary gratings have been simulated and fabricated. For both structures absorption enhancements corresponding to a photo current density gain of 1-2 mA/cm2 have been verified in optical measurements. To integrate these diffractive structures into fully processed silicon solar cells, we developed a passivation concept using a thin Al2O3 layer that provides a high-quality passivation for the rear side of the active silicon bulk and has a negligible influence on the optical properties. We also present a planarization process that prevents parasitic absorption in the rear side metal layer.