PBnDT-FTAZ, a �weak donor-strong acceptor� polymer that combines benzodithiophene (BnDT) and fluorinated benzotriazole (FTAZ), has received significant amount of attention because it is a peculiar material with many outstanding features that need to be further explained. For example, with a medium band gap of 2.0 V, PBnDT-FTAZ can still generate over 7% power conversion efficiency with a noticeably high fill factor over 70% in its BHJ cells with a relatively thick film (200 � 300 nm).In this talk, I will discuss our ongoing efforts to further optimize this interesting polymer. First, we discovered that all these interesting properties shown by PBnDT-FTAZ can only be obtained with polymers of a quite narrow range of molecular weight. Second, molecular engineering of PBnDT-FTAZ by substituting alkylthiol and selenophene in PBnDT-FTAZ give mixed results: both Voc and Jsc can be varied depending upon the substitutions.

Optimizing conjugated polymers for high efficiency solar cells: A case study of PBnDT-FTAZ

247th National Meeting (2014)

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