Journal
POLYMER
Volume 55, Issue 26, Pages 6708-6716Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2014.10.067
Keywords
Wide band-gap polymers; Polymer solar cells; Organic field-effect transistors
Categories
Funding
- Major Program for Cultivation of the National Natural Science Foundation of China [91233112]
- National Natural Science Foundation of China [21172187, 51273168, 21202139, 51403178]
- Innovation Group and Xiangtan Joint Project of Hunan Natural Science Foundation [12JJ7002, 12JJ8001]
- Open Project for National Key Laboratory of Luminescent Materials and Devices [2014-skllmd-10]
- Key Project of Hunan Province Education Department [13A102, 14C1099]
- Hunan Postgraduate Science Foundation for Innovation [CX2014B257, CX2013B268]
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Novel wide band-gap polymer of PBTFT containing dibenzosexithiophene-alt-bithiophene backbone was designed and synthesized via the Stille cross-coupling reaction. This polymer exhibited good thermal stability, well coplanar backbone and a broad absorption band from 350 nm to 610 nm with a wide optical band-gap of 2.02 eV. The polymer solar cells (PSCs) based on the PBTFT:PC71BM active layer showed the power conversion efficiency of 3.0% with an open circuit voltage of 0.70 V, a short-circuit current of 7.94 mA cm(-2) and a fill factor of 53.98% under the illumination of AM.1.5, 100 mW cm(-2). Holes mobility up to 0.028 cm(2) V-1 s(-1) with an on-off ratio of 1.0 x 10(6) was obtained in the PBTFT-based organic field-effect transistors (OFETs). Our work indicates that the dibenzosexithiophene-alt-bithiophene based copolymer can be efficiently applied in PSCs and OFETs. (C) 2014 Elsevier Ltd. All rights reserved.
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