K. Aryanpour, J. A. Muñoz, S. Mazumdar
Singlet fission, in which the optical spin-singlet exciton dissociates into two low energy triplet excitons, has been proposed as a viable approach to enhance the quantum efficiency of organic solar cells. We show that even when singlet fission is occurring in the donor molecule, the electronic structure at the donor-acceptor interface must satisfy specific requirements for the solar cell performance to be enhanced by this process. We focus on the pentacene-C$_{60}$ solar cell and based on our calculations and available experimental data we conclude that there is not enough evidence that these requirements are met by the donor-acceptor interface here. We propose experiments that can determine whether the minimal requirement for enhanced performance driven by singlet fission is met in this and other solar cells.
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http://arxiv.org/abs/1209.4442
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