Dicyanovinyl-unit-induced absorption enhancement of iridium(III) complexes in long-wavelength range and potential application in dye-sensitized solar cells  

作　　者：Dongdong Wang Hua Dong Xiaoyu Zhang Yong Wu Shaohua Shen Bo Jiao Zhaoxin Wu Min Gao Geng Wang 

机构地区：[1]Department of Applied Chemistry, School of Science, Xi’an Jiaotong University [2]Key Laboratory for Physical Electronics and Devices of the Ministry of Education, School of Electronic and information Engineering, Xi’An Jiaotong University [3]Key Laboratory for Advanced Materials, Institute of Fine Chemicals and Department of Chemistry, East China University of Science and Technology [4]International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University

出　　处：《Science China Chemistry》2015年第4期658-665,共8页中国科学（化学英文版）

基　　金：supported by the Fundamental Research Funds for the Central Universities(08143034);the National Basic Research Program of China(2013CB328705,2013CB328706);the National Natural Science Foundation of China(61275034,61106123)

摘　　要：Iridium complexes with dicyanovinyl-grafted phenylpyridine/l-phenylisoquinoline as ligands are synthesized and their photo- physical, electrochemical, and sensitization properties in DSSCs are investigated. The iridium complexes present significantly enhanced absorption from 400 to 525 nm. The 1-phenylisoquinoline-based iridium complex show bathochromic-shift emission in DMSO solution compared with their phenylpyridine-based counterpart, while their absorption response and photoluminescence peak in solid show little difference despite extension of the conjugated system. Using DSSCs, the conversion efficiency of 0.62% and open-circuit current of 1.4 mA/cm2 is achieved. The poor performance is attributed to the excited-state properties of iridium complexes according to the TD-DFT calculation.Iridium complexes with dicyanovinyl-grafted phenylpyridine/1-phenylisoquinoline as ligands are synthesized and their photophysical, electrochemical, and sensitization properties in DSSCs are investigated. The iridium complexes present significantly enhanced absorption from 400 to 525 nm. The 1-phenylisoquinoline-based iridium complex show bathochromic-shift emission in DMSO solution compared with their phenylpyridine-based counterpart, while their absorption response and photoluminescence peak in solid show little difference despite extension of the conjugated system. Using DSSCs, the conversion efficiency of 0.62% and open-circuit current of 1.4 m A/cm2 is achieved. The poor performance is attributed to the excited-state properties of iridium complexes according to the TD-DFT calculation.

关 键 词：dicyanovinyl group iridium complexes absorption response dye-sensitized solar cell 

分 类 号：O627[理学—有机化学] TM914.4[理学—化学]