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Issue 33, 2015
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Highly efficient photovoltaics and field-effect transistors based on copolymers of mono-fluorinated benzothiadiazole and quaterthiophene: synthesis and effect of the molecular weight on device performance

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Abstract

A new D–A conjugated polymer, namely poly[(5-fluoro-2,1,3-benzothiadiazole-4,7-diyl)-alt-(3′,4′′di(2-octyldodecyl)-2,2′:5′,2′′:5′′,2′′′-quaterthiophen-5,5′′′-diyl)] (P4TFBT), was designed and synthesized by using mono-fluorinated benzothiadiazole (FBT) as the acceptor and quaterthiophene (4T) as the donor. Two samples of P4TFBT with the same polydispersity index but different molecular weights (low molecular weight: L-P4TFBT; high molecular weight: H-P4TFBT) were obtained. Both L-P4TFBT and H-P4TFBT showed similar absorption bands from 300 nm to around 800 nm in the visible region, and the close optical band gaps at ca. 1.60 eV. Bulk heterojunction solar cells based on the blend of L-P4TFBT or H-P4TFBT with [6,6]phenyl-C71-butyric acid methyl ester (PC71BM) exhibited high power conversion efficiencies (PCEs) of 5.80% and 7.45%, respectively. H-P4TFBT also revealed a high p-channel organic field-effect transistor mobility of 0.39 cm2 V−1 s−1. These encouraging results indicate that P4TFBT is a promising low band gap material with high performance PSCs and OFETs simultaneously.

Graphical abstract: Highly efficient photovoltaics and field-effect transistors based on copolymers of mono-fluorinated benzothiadiazole and quaterthiophene: synthesis and effect of the molecular weight on device performance

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Publication details

The article was received on 27 Apr 2015, accepted on 30 Jun 2015 and first published on 03 Jul 2015


Article type: Paper
DOI: 10.1039/C5PY00615E
Polym. Chem., 2015,6, 6050-6057

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    Highly efficient photovoltaics and field-effect transistors based on copolymers of mono-fluorinated benzothiadiazole and quaterthiophene: synthesis and effect of the molecular weight on device performance

    M. Hao, X. Li, K. Shi, D. Xie, X. Zeng, J. Fang, G. Yu and C. Yang, Polym. Chem., 2015, 6, 6050
    DOI: 10.1039/C5PY00615E

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