Dresden 2011 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 55: Photovoltaics: mainly Technology and Photon Management
HL 55.1: Talk
Wednesday, March 16, 2011, 14:30–14:45, FOE Anorg
Spectral down-conversion in Sm-doped borate glasses for photovoltaic applications — •Marcel Dyrba1, Katharina Baumgartner2, Reinhard Carius2, Paul-Tiberiu Miclea3,4, and Stefan Schweizer1,3 — 1Centre for Innovation Competence SiLi-nano®, Martin Luther University of Halle-Wittenberg, Karl-Freiherr-von-Fritsch-Str. 3, 06120 Halle (Saale) — 2Institut für Energieforschung 5 (Photovoltaics), Forschungszentrum Jülich GmbH, 52425 Jülich — 3Fraunhofer Center for Silicon Photovoltaics, Walter-Hülse-Str. 1, 06120 Halle (Saale) — 4Institute of Physics, Martin Luther University of Halle-Wittenberg, Heinrich-Damerow-Str. 4, 06120 Halle (Saale)
A class of Sm-doped borate glasses has been developed for photovoltaic applications. The fluorescent glass is placed on top of a solar cell and, in the case of Sm3+ doping, converts the incident violet/blue part of the solar spectrum to visible red light which is efficiently converted to a photocurrent and enhances the solar cell efficiency. Borate glasses are good candidates as a matrix material since they offer a high optical transparency and they are robust and inexpensive. The chemical base composition of borates glasses consists of the network former boron oxide and metal oxides as network modifiers. The system can easily be doped with Sm3+ ions. However, the spectroscopic properties of Sm3+, in particular the fluorescence efficiency, are significantly influenced by the electron negativity of the network modifier. The external quantum efficiency (EQE) and spectral response of amorphous thin film silicon solar cells covered with fluorescent borate glasses have been evaluated.