文献类型：期刊文献

英文题名：Series of New D-A-π-A Organic Broadly Absorbing Sensitizers Containing Isoindigo Unit for Highly Efficient Dye-Sensitized Solar Cells

作者：Ying, Weijiang[1,2];Guo, Fuling[1,2];Li, Jing[1,2];Zhang, Qiong[1,2];Wu, Wenjun[1,2];Tian, He[1,2];Hua, Jianli[1,2]

机构：[1]E China Univ Sci & Technol, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Inst Fine Chem, Shanghai 200237, Peoples R China

年份：2012

卷号：4

期号：8

起止页码：4215

外文期刊名：ACS APPLIED MATERIALS & INTERFACES

收录：;EI(收录号：20123515375252);WOS:【SCI-EXPANDED(收录号:WOS:000307698600061)】；

基金：This work was supported by NSFC/China (2116110444, 21172073 and 21190033), National Basic Research 973 Program (2011CB808400), the Fundamental Research Funds for the Central Universities (WJ0913001 and WJ1114050) and Ph. D. Programs Foundation of Ministry of Education of China (20090074110004).

语种：英文

外文关键词：isoindigo; D-A-pi-A; broad absorption; chenodeoxycholic acid; solar cells; triarylamine

摘要：In this work, six new. D-A-pi-A sensitizers (ID1-ID6), with triarylamine as the electron donor; isoindigo as a auxiliary electron withdrawing unit; thiophene, furan, and benzene as the linker; and cyanoacrylic acid as the anchoring group, were synthesized through simple synthetic procedures and with low cost. Their absorption spectra were broad with long wavelength absorption maximum approximately at 589 nm and the absorption onset at 720 nm on the TiO2 film. Electrochemical experiments indicate that the HOMO and LUMO energy levels can be conveniently tuned by alternating the donor moiety and the linker. All of these dyes performed as sensitizers for the DSSCs test under AM 1.5 similar experimental conditions, and a maximum overall conversion efficiency of 5.98% (J(sc) = 14.77 mA cm(-2), V-oc = 644 mV, ff = 0.63) is obtained for ID-6 based DSSCs when TiO2 films were first immersed for 6 h in 20 mM CDCA ethanol solution followed by 12 h of dipping in the dye CH(2)Cl2 solution. Electrochemical impedance measurement data implies that the electron lifetime can be increased by coadsorption of CDCA, which leads to a lower rate of charge recombination and thus improved V-oc.