A 9,9′-bifluorenylidene derivative containing four 1,1-dicyanomethylene-3-indanone end-capped groups as an electron acceptor for organic photovoltaic cells?
New Journal of Chemistry Pub Date: 2019-10-21 DOI: 10.1039/C9NJ02604E
Abstract
A 9,9′-bifluorenylidene derivative, 2,2′,2′′,2′′′-([9,9′-bifluorenylidene]-2,2′,7,7′-tetrayltetrakis(4-octylthiophene-5,2-diyl))tetrakis(methanylylidene)tetrakis(3-oxo-2,3-dihydro-1H-indene-2,1-diylidene)tetramalononitrile (BF-TDCI4), was synthesized as an electron acceptor for organic photovoltaic cells. Its photophysical and electrochemical properties and thermal stability were investigated systematically. The photovoltaic devices were fabricated using PTB7-Th as the electron donor and BF-TDCI4 as the electron acceptor at various composition ratios. The optimized device exhibited a maximum power conversion efficiency of 4.35% with an open-circuit voltage of 0.87 V.
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Journal Name：New Journal of Chemistry
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CAS no.: 89640-58-4
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