Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 332, Issue -, Pages 283-292Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2016.08.033
Keywords
Carbazole sensitizer; Benzothiadiazole; pi-Bridge; Synthesis; Photovoltaic performance
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Funding
- National Natural Science Foundation of China [21406202]
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Six N-dimethylfluorenylcarbazole dyes have been synthesized based on benzene, furan and thiophene pi-bridge with or without benzothiadiazole auxiliary acceptor. Their photophysical properties and photovoltaic performance are investigated systematically based on the incorporation of benzothiadiazole and the variety of pi-bridges. The presence of benzothiadiazole broadens the absorption spectra and favors the light-harvesting abilities, which benefits better IPCE spectra and accordingly improved Jsc. In addition, benzothiadiazole plays a role on the effects of pi-bridge on the photoelectrical conversion efficiency. Dye bearing thiophene bridge achieves optimal photovoltaic performance 4.14% among those carbazole dyes without benzothiadiazole while when with benzothiadiazole dye bearing furan bridge exhibits the best cell efficiency 4.96% under AM 1.5G condition (N719 dye's 6.57% under the same condition). (C) 2016 Elsevier B.V. All rights reserved.
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