Abstract
Three triphenylamine dyes were synthesized with 4-phenyl-2-(thiophen-2-yl)thiazole as π-bridge and cyanoacrylic acid as the acceptor. The molecular structures of three compounds differ in the substituent on the triphenylamine donor. With the incorporation of the electron-withdrawing aldehyde or cyanoacrylic acid unit on the triphenylamine donor, the intramolecular charge transfer was weakened, which was characterized by the blueshifted absorption and the decreased molar extinction coefficient. The presence of aldehyde or cyanoacrylic acid unit raises the loading amount of dye on TiO2, however, increase the aggregation rate, bringing down VOC. Therefore, dye without substituent on the triphenylamine donor outperformed the other two dyes due to superior JSC and VOC, affording a 4.89 % cell efficiency.
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