Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8020717 | Materials Letters | 2014 | 4 Pages |
Abstract
A new low band gap (optical band gap=1.62Â eV) polymer (TTQ) based on thiophene and thienyl-quinoxaline by substituting phenyl in quinoxaline unit for thiophene rings was synthesized and characterized for application in polymer solar cells (PSCs). The optical band gap (Egopt) deduced from the onset (765Â nm) of the polymer absorption spectrum in the films was 1.62Â eV, which was less than those of the polymers TQ and FTQ and was closer to the ideal band gap of a donor for BHJ polymer solar cell applications. For the optimized polymer solar cell of TTQ:PC71BM, 1:1 w/w, in DCB solution, a PCE over 1.41% with Voc of 0.70Â V, Jsc of 3.89Â mA/cm2, and fill factor (FF) of 55% under AM1.5 conditions was achieved by solvent annealing in comparing with those of solvent surface treatment devices (PCE of 1.34%) and thermal annealing devices (PCE of 1.10%).
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Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
Bowen Gao, Chao Gao, Haimei Wu, Wenxiu Que, Wei Wei,