Journal
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
Volume 11, Issue 6, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssr.201700087
Keywords
benzothiadiazole; bulk heterojunctions; conjugated polymers; fluorination; power conversion efficiency; solar cells
Funding
- Russian Federal Agency for Scientific Organizations [0089-2014-0036]
- Research Program of the Presidium of Russian Academy of Sciences The basics of fundamental studies of nanotechnologies and nanomaterials [0089-2015-0234]
- Russian President Science Foundation [SP-835.2016.1]
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We synthesized and investigated novel low bandgap (X-DADAD-)(n)-type donor-acceptor copolymers comprising non-fluorinated 2,1,3-benzothiadiazole (BT) and the fluorinecontaining 5,6-difluoro-2,1,3-benzothiadiazole (ffBT) as the electron acceptor blocks (A). The introduction of fluorine substituents was shown to influence optical, electrochemical, and morphological properties of the polymers, as well as their photovoltaic performance. Optimized bulk heterojunction solar cells based on the fluorine-loaded polymer P2 showed improved characteristics (efficiency of 5.2%) as compared to the reference cells based on the non-fluorinated polymer P1 (efficiency of 4.4%).
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