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Article Dans Une Revue Solar Energy Materials and Solar Cells Année : 2011

Temperature dependence of open-circuit voltage and recombination processes in polymer-fullerene based solar cells

Résumé

In this article, we have studied the temperature and illumination dependence of open-circuit voltage (VOC) in polymer-fullerene based solar cells. It has been observed that VOC at higher illumination intensities gets converged at 0 K which gives information about maximum achievable VOC in a particular donor-acceptor blend. Besides this, recombination processes have been studied by transient open-circuit voltage decay (TOCVD) and the transition between recombination regimes has been observed for the first time. At low VOC carrier lifetime exhibits a constant value around 500 μs, which is interpreted in terms of a monomolecular recombination regime. At higher VOC carrier lifetime decreases as derived from a bimolecular relaxation law. The method allows estimating the recombination coefficient, which results in 2×10−13 cm3 s−1. The results have been explained by considering Gaussian density-of-states (DOS) for highest-occupied molecular orbital (HOMO) and lowest-unoccupied molecular orbital (LUMO).

Domaines

Matériaux

Dates et versions

hal-00611786 , version 1 (27-07-2011)

Identifiants

Citer

Anil K. Thakur, Guillaume Wantz, Germa Garcia-Belmonte, Juan Bisquert, Lionel Hirsch. Temperature dependence of open-circuit voltage and recombination processes in polymer-fullerene based solar cells. Solar Energy Materials and Solar Cells, 2011, 95 (8), pp.2131-2135. ⟨10.1016/j.solmat.2011.03.012⟩. ⟨hal-00611786⟩
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