D–A–π–A featured sensitizers containing an auxiliary acceptor of benzoxadiazole: molecular engineering and co-sensitization
2015
Zhu, Haîbo | Wu, Yongzhen | Liu, Jingchuan | Zhang, Weiwei | Wu, Wenjun | Zhu, Wei-Hong
Two novel D–A–π–A organic sensitizers (WS-24 and WS-26) incorporating a benzoxadiazole (BOD) unit are synthesized for dye sensitized solar cells. An additional n-hexylthiophene unit is incorporated into WS-26 to decrease unfavourable dye aggregation, thus suppressing charge recombination and increasing the solubility. Incorporating an auxiliary acceptor of benzoxadiazole (BOD) into the π-bridge can red shift absorption bands, and sharply decrease the LUMO level. In virtue of co-sensitization, the WS-26 based DSSC device can achieve photovoltaic efficiency as high as 9.72%.
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