Paper published in Energy & Environmental Science

Cascaded energy heterojunctions make it energetically favorable for electrons and holes to separate, in a similar way to photosynthesis.  In this paper a Monte Carlo model is used to see how effective these structures are at suppresing geminate recombination.  It is found that energy cascades similar to the ones reported for polymer fullerene OPVs do indeed significantly improve the efficiency of charge separation.  This raises the tantalising possibility that good OPV performance can be designed by careful control of the donor-acceptor interface.

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