Improvement of photon collection in Cu(In,Ga)Se2 solar cells and modules by fluorescent frequency conversion |
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Authors: | Gerda C Glaeser |
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Affiliation: | Institut für Physikalische Elektronik (ipe), Universität Stuttgart, Pfaffenwaldring 47, 70569 Stuttgart, Germany |
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Abstract: | Fluorescent photon down conversion for the improvement of the blue response of ZnO/CdS/Cu(In,Ga)Se2 heterojunction solar cells and modules is investigated. Fluorescent dyes of the series Lumogen® F are analyzed by optical transmission and reflection as well as by photoluminescence measurements. A spectral transfer matrix formalism is introduced that allows to predict the suitability of a luminescent dye as a down-converter for a given solar cell from its absorption/emission properties. We find that Lumogen® F Violet 570 and Lumogen® F Yellow 083 as well as a combination of both yields improvements for Cu(In,Ga)Se2 solar modules. Particularly, we find that the short circuit current density of a Cu(In,Ga)Se2 mini-module is improved by 1.5 mA cm− 2 when applying a varnish with a combination of Lumogen® F Violet and Yellow. About 0.5 mA cm− 2 of this improvement is due to a reduced overall reflectance and an improvement of 1 mA cm− 2 results from the frequency conversion by the dyes. |
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Keywords: | Fluorescent light conversion Spectral transfer matrix Cu(In Ga)Se2 Mini-modules |
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