Abstract
Three benzocarbazole dyes were synthesized with N-butylbenzocarbazole as the electron donor, benzene, furan and thiophene as π-bridge, and cyanoacrylic acid as the electron acceptor. Their photophysical properties and photovoltaic performance were investigated and compared among three π-bridges. The incorporation of thiophene or furan unit favors intramolecular charge transfer through reducing the energy gap and improving the molecular conjugation due to their electron-rich properties and small volume compared with benzene unit. On the other hand, weakening coplanarity of dye with benzene bridge contributes to the antiaggregation and accordingly increase VOC, though decreases photo-generated current. Among three dyes, dye with furan bridge achieves the optimal photovoltaic performance 7.67% due to the highest JSC 15.45 mA cm−2.
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