Abstract
We have measured charge carrier transport and recombination in bulk-heterojunction solar-cells. Time-of-flight, carrier extraction by linearly increasing voltage and double injection techniques which are complementary to each other have been used to study the solar-cells of different thicknesses and conductivities. We show the importance of carrier mobility and bimolecular recombination coefficient for testing the suitability of materials in bulk-heterojunction solar-cells. The reduced bimolecular recombination coefficient at zero electric field and its electric field dependence are measured directly. The bimolecular recombination coefficient and Langevin-type coefficient values β/β<i>L</i> ≈ 10<sup>-4</sup> are in the good agreement when measured with presented techniques.
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