Proceedings of Online nanoGe Fall Meeting 20 (OnlineNFM20)
Publication date: 4th October 2020
Efficiencies of organic solar cells have doubled since the development of non-fullerene acceptors (NFAs). Despite this, it is still unclear how the acceptor-donor-acceptor molecular architecture, elongated molecular shape, and planar conjugated core of typical NFAs contribute to the observed efficiency boost. We demonstrate that electrostatics of acceptor-donor-acceptor molecules provides barrierless dissociation of excited states, as well as lossless charge extraction. We also show that the donor-acceptor-donor architecture would be an appropriate design for the donor molecule. Our findings are experimentally supported by analyzing various PCE10:NFA solar cells, with NFAs including Y6, IEICO, O-IDTBR, O-IDTBCN, ITIC, and their halogenated derivatives.
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