Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Recombination between photogenerated electrons and holes is a key limiting factor in the functioning of dye-sensitized solar cells (DSC) and other new generation solar cells like organic solar cells and perovskite-based solar cells. In this paper we investigate recombination from a fundamental point of view using random-walk numerical simulations (RWNS, Monte Carlo) and experimental studies of the recombination rate in DSC using open-circuit voltage decay (OCVD), electrochemical impedance spectroscopy (EIS) and Intensity-modulated voltage spectroscopy (IMVS). Specifically, we look at the impact of energy disorder and chemical environment on the recombination process. Experimentally, we present results for the electron lifetime in test DSC devices where the polarity of the solvent is systematically varied. The obtained results can be rationalized by RWNS calculations where charge transfer across the interface is modeled by a combination of a hopping mechanism of transport and recombination probabilities that formally depend on the reorganization energy and the distribution of donor and acceptor states.
Illustration of transport/recombination mechanisms across a disordered heterojunction
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