Journal
CHEMISTRY OF MATERIALS
Volume 28, Issue 20, Pages 7479-7486Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.6b03189
Keywords
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Funding
- China Scholarship Council (CSC)
- Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University
- National Natural Science Foundation of China [61222401, 61674111]
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In contrast to the great efforts on developing novel donor (D)-acceptor (A) copolymers, research on investigating the backbone composition of conjugated polymer is rare. In this contribution, we disclose the design and synthesis of a ternary D1-D2-A-D2 structured conjugated polymer PBSF. Compared to the typical D-A polymer with fixed D/A moiety number, the ternary structure can tune the optical and electrical properties more comprehensively and delicately. Precisely control of the ternary fragments relative to the backbone vector was achieved, further promoting sufficient planar structure, strong intermolecular packing, and excellent charge transport. Finally, the additive and annealing-free polymer solar cells based on PBSF and phenyl-C-71-butyric acid methyl ester ([70]PCBM; PCE = 7.4%) or cheap, nonfunctionalized C-70 (PCE = 5.3%) demonstrate excellent performance using either chlorinated or nonhalogenated green solvent. We believe that this novel and efficient ternary structure may spark future polymer design to achieve sustainable-processed photovoltaic devices for practical mass production.
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