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ECN publication
Temperature dependence for the photovoltaic device parameters of polymer-fullerence solar cells under operating conditions
Kroon, J.M.; Wienk, M.M.; Katz, E.A.; Faiman, D.; Tuladhar, S.M.; Fromherz, T.; Padinger, F.; Brabec, C.J.; Sariciftci, N.S.
Published by: Publication date:
ECN Solar Energy 1-11-2001
ECN report number: Document type:
ECN-RX--01-067 Article (scientific)
Number of pages:

Published in: Journal of Applied Physics (American Institute of Physics), , 2001, Vol.90, p.5343-5350.

We report on the temperature dependence of various photovoltaic device parameters of solar cells, fabricated from interpenetrating networks of conjugated polymers with fullerenes, in the wide temperature range of their possible operating conditions (25-60C). The open-circuit voltage was found to decrease linearly with increasing temperature. For the short-circuit current, we observed a monotonic increase with increasing temperature, followed by a saturation region. The rate of this increase (coupled to a corresponding increase for the fill factor) was found to overtake the corresponding rate of decrease in voltage, resulting in an overall increase of the energy conversion efficiency. The efficiency was observed to reach a maximum value in the approximate range 47-60C. The results are discussed with respect to possible mechanisms for photovoltage generation and charge carrier transport in the conjugated polymer-fullerene composite, and in particular, thermally activated charge carrier mobility.

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