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Modeling the temperature induced degradation kinetics of the short circuit current in organic bulk heterojunction solar cells

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7 Author(s)
Conings, Bert ; IMEC-IMOMEC, vzw, Institute for Materials Research, Hasselt University, 3590 Diepenbeek, Belgium ; Bertho, Sabine ; Vandewal, Koen ; Senes, Alessia
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In organic bulk heterojunction solar cells, the nanoscale morphology of interpenetrating donor-acceptor materials and the resulting photovoltaic parameters alter as a consequence of prolonged operation at temperatures above the glass transition temperature. Thermal annealing induces clustering of the acceptor material and a corresponding decrease in the short circuit current. A model based on the kinetics of Ostwald ripening is proposed to describe the thermally accelerated degradation of the short circuit current of solar cells with poly(2-methoxy-5-(3,7-dimethyloctyloxy)-1,4-phenylenevinylene) (MDMO-PPV) as donor and (6,6)-phenyl C61-butyric acid methyl ester (PCBM) as acceptor. The activation energy for the degradation is determined by an Arrhenius model, allowing to perform shelf life prediction.

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Applied Physics Letters  (Volume:96 ,  Issue: 16 )