Abstract

Organic photovoltaics based on solution processing is currently receiving tremendous attention because of recent progress made in improved conversion efficiencies, and the potential for use in large area flexible solar cells. Efficient dissociation of the photogenerated excitons is facilitated in these systems by introducing hetero-junctions between a polymer, which acts as the electron donor, and another polymer and/or small molecule as the electron acceptor. Currently most approaches are focusing on the use of C60 and derivatives thereof as electron acceptors together with regio-regular poly(3-hexylthiophene) (P3HT) as electron donor. While these devices show high quantum efficiencies, the obtained open circuit voltage near 0.7 V is rather low.

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