Increased Upconversion Response in a-Si:H Solar Cells With Broad-Band Light
| Autor: | Jatindra K. Rath, T. F. Duindam, W.G.J.H.M. van Sark, Ruud E. I. Schropp, J. de Wild, Andries Meijerink |
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| Rok vydání: | 2013 |
| Předmět: |
Amorphous silicon
Materials science business.industry Band gap Condensed Matter Physics Solar energy Photon upconversion Electronic Optical and Magnetic Materials chemistry.chemical_compound Optics chemistry Transmittance Optoelectronics Solar simulator Electrical and Electronic Engineering Photonics business Absorption (electromagnetic radiation) |
| Zdroj: | IEEE Journal of Photovoltaics. 3:17-21 |
| ISSN: | 2156-3403 2156-3381 |
| DOI: | 10.1109/jphotov.2012.2213799 |
| Popis: | High-bandgap solar cells such as a-Si:H with a bandgap around 1.8-eV loose 50% of the incident solar energy due to transmittance of near infrared photons. Part of these photons can be converted into visible photons with a suitable upconverter and in this way can increase the photo response of solar cells in the near infrared. In this contribution, we demonstrate increased photo response of a-Si:H solar cells for sub bandgap light under broad-band light excitation of the upconverter. Broad-band excitation represents daily life and is more effective because simultaneously different wavelengths can be absorbed and converted. Bifacial a-Si:H solar cells were made with and without Gd2O2S: Er3+, Yb3+ upconverter attached at the back of the cells. A set-up was made to concentrate near infrared light from a solar simulator up to 25 times. I-V curves were measured of upconverter and reference solar cells. The upconverter solar cells showed a nonlinear and stronger increase in current with increasing concentration than the reference solar cells. |
| Databáze: | OpenAIRE |
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