Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 105, Issue -, Pages 220-228Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solmat.2012.06.006
Keywords
Photovoltaic; Conjugated polymers; 1,2-squaraines; Solar cells
Funding
- National Natural Science Foundation of China (NSFC) [20872103, 50803040, 21072139, 21190031, 61177032]
- Open Project Program of Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, China [10HJYH02]
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Two D-A type conjugated polymers bearing 3,4-dithiophenyl-1,2-squaraine as acceptor segment, thiophene and benzo[1,2-b;4,5-b']dithiophene (BDT) as donor moieties, namely. PTTST and PBDTTST, are synthesized by Stille coupling reaction. Compared with their reference polymer PBDTTT without 1,2-squaraine unit, both PTTST and PBDTTST possess more extended absorption in the vis-NIR region of 600-800 nm and lowered HOMO energy levels of 0.1-0.2 eV. Bulk-heterojunction PSC with PBDTTST as p-type material shows high performance with the best PCE value of 1.26% (V-oc = 0.87 V, J(sc) = 3.81 mA/cm(2), FF = 0.38) under irradiation of 100 mW/cm(2), while that of PBDTTT-based PSC is 0.36%. Therefore, 1,2-squaraine is a promising electron-acceptor component for construction of high performance photovoltaic D-A type conjugated photovoltaic polymers. (c) 2012 Elsevier B.V. All rights reserved.
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