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Optical Characterization of ITO Films on Fluorescent Borate Glasses for High Efficiency Solar Cells
F. Steudel, P.-T. Miclea, N. Teuscher, A. Heilmann, S. Schweizer
Thin Film Solar Cell, High Efficiency, Down Conversion
Advanced Photovoltaics : New Concepts and Ultra-High Efficiency
Subtopic: Fundamental Studies
Event: 26th European Photovoltaic Solar Energy Conference and Exhibition
Session: 1CV.3.7
255 - 258
ISBN: 3-936338-27-2
Paper DOI: 10.4229/26thEUPVSEC2011-1CV.3.7
0,00 EUR
Document(s): paper


Solar cells with a cover glass have a low response in the blue and near UV spectral range due to absorption in the glass and the front contact layer. The efficiency of these solar cells can be improved by replacing the top glass layer by a spectral converter, i.e. a frequency down-converter, without modifying the solar cell itself. Potential candidates are fluorescent, samarium-doped borate glasses. They convert the incident violet and blue part of the solar spectrum to visible red light, which is more efficiently absorbed by the solar cell. Borate glasses with different network modifiers are investigated for their potential as substrates for conductive indium tin oxide (ITO) thin films. The deposition is done by radio frequency magnetron sputtering. Apart from the layer thickness, the optical and electrical parameters are determined. Finally, to evaluate the potential of fluorescent borate glasses as a substrate material for thin film photovoltaics, two small-sized modules were manufactured by depositing an additional silicon absorber layer and an aluminium back contact on the ITO coated borate glasses. A fluorescent Sm-doped and an undoped borate glass were deposited simultaneously.