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• W2073973071 abstract "Three novel conjugated copolymers containing a coplanar bithiophenevinyl-(2-pyran-4-ylidenemalononitrile) unit linked with different electron-donating moieties by a double bond were synthesized via Heck polycondensation reactions and characterized using nuclear magnetic resonance, gel permeation chromatography and elemental analysis. Thermogravimetric analysis of the copolymers revealed that they have good thermal stability, with a decomposition temperature >330 °C. By eliminating torsional interactions between donor and acceptor units, combination by double bonds resulted in an enhancement of the conjugated length, extension of the absorption spectral range and a low band gap of the polymers. Cyclic voltammetry measurements suggest that the highest occupied molecular orbital and the lowest unoccupied molecular orbital energy levels of the copolymers can be fine-tuned by introducing donor units with different electron-donating ability. Bulk-heterojunction photovoltaic cells were fabricated with the copolymers as the donors and (6,6)-phenyl C71-butyric acid methyl ester as the acceptor. The cells based on the three copolymers exhibited power-conversion efficiencies of 0.36, 0.41 and 0.47% under one sun of air mass 1.5 solar simulator illumination (100 mV cm−2). Three novel conjugated copolymers containing coplanar bithiophenevinyl-(2-pyran-4-ylidenemalononitrile) unit linked with different electron-donating moieties by a double bond were synthesized by Heck polycondensation reactions. By introducing a double bond between the donor and acceptor unit within the backbone of polymers instead of a single bond, the conjugated length was enhanced, and consequently broader absorption spectral range and reduced band gap. Hence, the polymer can absorb more light to get higher Jsc and power-conversion efficiency." @default.
• W2073973071 created "2016-06-24" @default.
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• W2073973071 date "2013-03-27" @default.
• W2073973071 modified "2023-10-17" @default.
• W2073973071 title "Synthesis and photovoltaic properties of low band gap copolymers containing (bithiophenevinyl)-(2-pyran-4-ylidenemalononitrile) (TVM) moieties" @default.
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• W2073973071 doi "https://doi.org/10.1038/pj.2013.36" @default.
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