Azadipyrromethene-based Zn(II) complexes as nonplanar conjugated electron acceptors for organic photovoltaics.

Mao, Zhenghao; Senevirathna, Wasana; Liao, Jia-Yu; Gu, Jun; Kesava, Sameer Vajjala; Guo, Changhe; Gomez, Enrique D; Sauvé, Geneviève · Adv Mater · 2014

basic_science · Level V

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Abstract

The effectiveness of new a electron acceptor for organic solar cells is demonstrated. The acceptor is a homoleptic zinc(II) complex of 2,6-diphenylethynyl-1,3,7,9-tetraphenylazadipyrromethene. The high power-conversion efficiency obtained is attributed to the acceptor's 3D structure, which prevents crystallization and promotes a favourable nanoscale morphology, its high Voc , and its ability to contribute to light harvesting at 600-800 nm.