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Nanostructured Back Side Reflectors for Silicon Solar Cells

: Eisenlohr, J.; Benick, J.; Peters, M.; Höhn, O.; Janz, S.; Goldschmidt, J.C.; Bläsi, B.; Hermle, M.; Glunz, S.W.

Volltext urn:nbn:de:0011-n-2210536 (1.6 MByte PDF)
MD5 Fingerprint: 67e1b24d701c36e1ba90b3fb5a47e931
Erstellt am: 7.12.2012

European Commission:
26th European Photovoltaic Solar Energy Conference and Exhibition, EU PVSEC. Proceedings : 5th to 9th September 2011 at the CCH - Congress Centre and International Fair Hamburg in Germany
München: WIP-Renewable Energies, 2011
ISBN: 3-936338-27-2
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <26, 2011, Hamburg>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer ISE ()
Solarzellen - Entwicklung und Charakterisierung; Silicium-Photovoltaik; Angewandte Optik und funktionale Oberflächen; Oberflächen - Konditionierung; Passivierung; Lichteinfang; Herstellung und Analyse von hocheffizienten Solarzellen; Mikrostrukturierte Oberflächen; Industrielle und neuartige Solarzellenstrukturen

The application of diffractive structures to the back side of silicon solar cells is a promising approach to enhance the light path length for photons with energies close to the band gap. In this paper, a nanostructured back side reflector for silicon solar cells is investigated. The reflector consists of hexagonally ordered SiO2 spheres embedded in a high refractive index matrix. Optical simulations using the rigorous coupled wave analysis indicate that with a monolayer of SiO2 spheres in a silicon matrix, the photo current density can be increased by over 3 mA/cm2 for a planar silicon solar cell with a thickness of 40 µm. An optimum sphere diameter of 1100 nm is determined. Monolayers of highly ordered monodisperse SiO2 spheres have been deposited by spin coating. For the inversion of the monolayer, three different techniques - plasma enhanced chemical vapour deposition (PECVD), atomic layer deposition (ALD) and sol gel processes - are tested. The PECVD process results only in incomplete inversion, while ALD and sol gel processes successfully invert the monolayer.