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Optical properties of magnetron sputtered thin dielectric films containing terbium(III) for spectral conversion in thin film solar cells

: Baumgartner, K.; Angelov, O.; Sendova-Vassileva, M.; Holländer, B.; Ahrens, B.; Schweizer, S.; Dimova-Malinovska, D.; Carius, R.

Sinke, W. ; WIP - Renewable Energies, München; European Commission; UNESCO; World Council for Renewable Energy; International Photovoltaic Equipment Association:
24th European Photovoltaic Solar Energy Conference 2009. CD-ROM : The compiled State-of-the-Art of PV Solar Technology and Deployment. Proceedings of the International Conference held in Hamburg, 21-25 September 2009
München, 2009
ISBN: 3-936338-25-6
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <24, 2009, Hamburg>
Conference Paper
Fraunhofer IWM ()
photoluminescence; lifetime; magnetron sputtering

Photovoltaic modules with glass as cover or as superstrate show a poor blue and near UV response due to absorption in the glass and in the doped layer. This poor response of all glass covered solar cells promises an enhancement by spectral conversion of the short wavelength part of the solar spectrum. Thin transparent dielectric films containing Tb3+ are developed for this application. These spectral converters with absorption bands between 200 and 400 nm shall be deposited on top of the glass. Their emission bands in the region 400 - 600 nm are well suited for the spectral response of thin film silicon solar cells. Here, the results on the deposition by RF magnetron co-sputtering and characterization of thin SiO2 and Al2O3 films containing Tb3+ ions are presented. The highest photoluminescence intensity was found at about 1 at.% Tb in both host materials for as-deposited films. The measured lifetime of the 5D4 - 7F5 (~ 546 nm) transition was determined to about 1 ms. Annealing studies lead to an enhancement of the photoluminescence intensity by a factor of 2.5 - 3 times.