Regensburg 2010 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 39: Glasses and Glass Transition II (jointly with DY and DF)

CPP 39.10: Talk

Thursday, March 25, 2010, 12:00–12:15, H38

Spectral down-conversion in Sm-doped borate glasses for photovoltaic applications — •Marcel Dyrba¹, Paul-Tiberiu Miclea^2,3, and Stefan Schweizer^1,2 — ¹Centre for Innovation Competence SiLi-nano^®, Martin Luther University of Halle-Wittenberg, Karl-Freiherr-von-Fritsch-Str. 3, 06120 Halle (Saale) — ²Fraunhofer Center for Silicon Photovoltaics, Walter-Hülse-Str. 1, 06120 Halle (Saale) — ³Institute of Physics, Martin Luther University of Halle-Wittenberg, Heinrich-Damerow-Str. 4, 06120 Halle (Saale)

Samarium fluorescence in glasses has attracted much attention in the past two decades, in particular for studies on spectral-hole burning, excited state absorption, and laser properties. Here, 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 red light which is more efficiently absorbed by the solar cell. The chemical base composition of borate glasses consists of the network former boron oxide and metal oxides as network modifiers. The spectroscopic properties of Sm³⁺, in particular the fluorescence efficiency, are significantly influenced by the electron negativity of the network modifier. Some of the glasses are additionally doped with silver oxide. Subsequent heat treatment causes reduction of the doped silver ions and leads to the formation of metallic silver nanoparticles. The effect of the local field enhancement around the Sm³⁺ ions, which is due to surface plasmons from the silver nanoparticles being close by, is investigated.