文献类型：期刊文献

英文题名：Organic Sensitizers with Extended Conjugation Frameworks as Cosensitizers of Porphyrins for Developing Efficient Dye-Sensitized Solar Cells

作者：Cheng, Yingchun[1,2];Yang, Guosheng[1,2];Jiang, Haoran[3];Zhao, Shuangliang[3];Liu, Qingyun[4];Xie, Yongshu[1,2]

机构：[1]East China Univ Sci & Technol, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai Key Lab Funct Mat Chem, Inst Fine Chem, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[4]Shandong Univ Sci & Technol, Coll Chem & Environm Engn, Qingdao 266510, Peoples R China

年份：2018

卷号：10

期号：45

起止页码：38880

外文期刊名：ACS APPLIED MATERIALS & INTERFACES

收录：;EI(收录号：20184706104558);WOS:【SCI-EXPANDED(收录号:WOS:000451100500023)】；

基金：This work was financially supported by the NSFC (Grant Nos. 21472047, 21772041, and 21811530005), the Program for Professor of Special Appointment (Eastern Scholar; Grant GZ2016006) at Shanghai Institutions of Higher Learning, and the Fundamental Research Funds for the Central Universities (Grant Nos. WK1616004 and 222201717003). The authors thank Research Center of Analysis and Test of East China University of Science and Technology for the help on the characterization.

语种：英文

外文关键词：dye-sensitized solar cells; cosensitizers; dye aggregation; porphyrins; triphenylamine; benzothiadiazole

摘要：Relatively high efficiencies have been achieved for porphyrin-based dye-sensitized solar cells. For the purpose of designing efficient cosensitizers, we herein report systematically optimized dyes XC1-XC5 employing a triphenyl-amine donor, a benzothiadiazole moiety as the auxiliary acceptor, and a benzoic acid acceptor. One hexyl and four hexyloxy groups were introduced, and an ethynylene moiety was introduced between the donor and the auxiliary acceptor to afford XC1. To further extend the absorption wavelength, a second ethynylene moiety was introduced between the acceptor and the auxiliary acceptor to afford XC2. XC3 and XC4 were designed by introducing one and two methyl substituents, respectively, into the meta-positions of the anchoring carboxyl group. XC5 was further synthesized by inserting a cyano substituent into one of the ortho-positions of the carboxyl group with the purpose to strengthen the intramolecular charge-transfer effect and thus broaden the absorption wavelength. As expected, compared with the J(sc) (14.29 mA.cm(-2)) of XC1, the corresponding J(sc) values for XC2 XC5 were enhanced to 16.50, 16.95, 16.73, and 17.74 mA.cm(-2), respectively. Moreover, XC4 exhibits the highest V-oc of 770 mV owing to the presence of a maximum of seven chains, which can effectively suppress dye aggregation. As a result, compared with XC1, XC2 XC5 exhibit improved efficiencies of 8.67, 9.05, 8.78, and 9.30%, respectively. In addition, the efficiencies of XC3 and XC5 were further enhanced by cosensitizing them with our previously reported porphyrin dye XW28 under various conditions. Finally, a remarkable efficiency of 10.50% was achieved for the cells cosensitized with XC5 and XW28. These results indicate that the combination of good planarity of the extended D-pi-A framework with multiple alkoxy/alkyl chains may compose an effective optimizing strategy for designing and synthesizing excellent cosensitizers for porphyrins.