2,1,3-Benzooxadiazole, thiophene and benzodithiophene based random copolymers for organic photovoltaics: Thiophene versus thieno[3,2-b]thiophene as pi-conjugated linkers

Date

2017-04-02

Author

Göker, Seza
Hizalan, Gonul
Aktas, Ece
Kutkan, Seda
Çırpan, Ali
Toppare, Levent Kamil

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Three conjugated random copolymers comprising benzodithiophene and thiophene as the donor units and benzooxadiazole as the acceptor unit, spaced with thiophene and thieno[3,2-b]thiophene π-bridges, were designed and synthesized. The effects of different linkers on the optical and electrochemical properties were investigated. The polymer containing a thieno[3,2-b]thiophene π-bridge revealed a red shifted absorption compared to its thiophene analogue. Morphological and photovoltaic properties of a polymer:fullerene blend film were investigated. The blend of one of the random copolymers (P2) and PC71BM ([6,6]-phenyl-C71-butyric acid methyl ester) revealed a photovoltaic performance efficiency of 5.17% due to the high short-circuit current density and fill factor.

URI

https://hdl.handle.net/11511/52619

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Department of Chemistry, Conference / Seminar