Journal
POLYMER CHEMISTRY
Volume 4, Issue 1, Pages 57-60Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2py20786a
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Funding
- National Natural Science Foundation of China [20990233]
- Hi-Tech Research and Development Program (863) of China [2011AA050524]
- Solar Energy Initiative of the Chinese Academy of Sciences [KGCX2-YW-399 + 9]
- Fund for Distinguished Young Scholar [20925415]
- Fund for Creative Research Groups of NSFC [50921062]
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A new planar conjugated polymer, poly{benzo(1,2-b:3,4-b':5,6-d '') trithiophene-alt-4,4'-dihexyl-2,2'-bithiazole} (BTT-BTz), with a broad band gap and higher V-oc based on benzotrithiophene and bithiazole units, was designed and synthesized. This copolymer possesses a deeper HOMO (-5.65 eV), and after 1,8-diiodoctane treatment, the power conversion efficiency of the photovoltaic device based on the BTT-BTz/PC71BM photoactive layer reaches 5.06% with 0.81 V of open-circuit voltage, 10.9 mA cm(-2) of short-circuit current and 0.57 of fill factor, which is the highest one among the conjugated polymers based on BTT or BTz derivatives. This new conjugated copolymer seems a promising candidate for the application in tandem solar cells.
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