Phenothiazine dyes containing a 4-phenyl-2-(thiophen-2-yl) thiazole bridge for dye-sensitized solar cells

摘要： Two novel phenothiazine dyes bearing a single or double cyanoacrylic acid acceptors, which share the same electron donor phenothiazine and the same 4-phenyl-2-(thiophen-2-yl)thiazole p-bridge, were synthesized. Thus, phenothiazine dyes with D-p-A and A-D-p-A framework were con?gured, and their photophysical properties and photovoltaic performance were investigated. The incorporation of another cyanoacrylic acid acceptor was found to bene?t the loading amount on TiO2, the light-harvesting ability, and the electron-injection ef?ciency. Dye with double cyanoacrylic acid acceptors showed a double short-circuit current compared with dye with a single acceptor. Therefore, dye with double cyanoacrylic acid acceptors achieved improved photoelectric conversion ef?ciency 4.35% (JSC ? 10.29 mA cm?2, VOC ? 0.65 V, FF ? 0.65) under standard global AM 1.5 G solar condition with dye N719 (7.19%) as a reference.