Effect of electron-withdrawing groups in conjugated bridges： molecular engineering of organic sensitizers for dyesensitized solar cells  

作　　者：Jie SHI Zhaofei CHAI Runli TANG Huiyang LI Hongwei HAN Tianyou PENG Qianqian LI Zhen LI 

机构地区：[1]Department of Chemistry, Hubei Key Lab on Organic and Polymeric Opto-Electronic Materials, Wuhan University, Wuhan 430072, China [2]Hubei Key Laboratory of Oilcrops Lipid Chemistry and Nutrition, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China [3]Michael Gratzel Center for Mesoscopic Solar Cells, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China

出　　处：《Frontiers of Optoelectronics》2016年第1期60-70,共11页光电子前沿（英文版）

摘　　要：Four organic sensitizers containing quinoxaline or benzoxadiazole as an auxiliary electron acceptor in conjugated bridge were synthesized and utilized for dyesensitized solar cells （DSSCs）. It was found that the incorporation of different electron-withdrawing moieties can affect the absorption spectra, electronic properties, the interfacial interactions and then the overall conversion efficiencies significantly. Therefore, the appropriate selection of the auxiliary acceptor was important to optimize the photovoltaic performance of solar cells. Among these sensitizers, LI-44 based solar cell showed the best photovoltaic performance： a shortcircuit photocurrent density （Jsc） of 13.90 mA/cm2, an open-circuit photovoltage （Voc） of 0.66 V, and a fill factor （FF） of 0.66, corresponding to an overall conversion efficiency of 6.10% under standard global AM 1.5 solar light conditions.Four organic sensitizers containing quinoxaline or benzoxadiazole as an auxiliary electron acceptor in conjugated bridge were synthesized and utilized for dyesensitized solar cells （DSSCs）. It was found that the incorporation of different electron-withdrawing moieties can affect the absorption spectra, electronic properties, the interfacial interactions and then the overall conversion efficiencies significantly. Therefore, the appropriate selection of the auxiliary acceptor was important to optimize the photovoltaic performance of solar cells. Among these sensitizers, LI-44 based solar cell showed the best photovoltaic performance： a shortcircuit photocurrent density （Jsc） of 13.90 mA/cm2, an open-circuit photovoltage （Voc） of 0.66 V, and a fill factor （FF） of 0.66, corresponding to an overall conversion efficiency of 6.10% under standard global AM 1.5 solar light conditions.

关 键 词：dye-sensitized solar cells （DSSCs） auxiliary electron acceptor QUINOXALINE benzoxadiazole 

分 类 号：TM914.4[电气工程—电力电子与电力传动] O625[理学—有机化学]