文献类型：期刊文献

英文题名：Efficient solar cells sensitized by a promising new type of porphyrin: dye-aggregation suppressed by double strapping

作者：Zeng, Kaiwen[1,2];Lu, Yunyue[1,2];Tang, Weiqiang[3,4];Zhao, Shuangliang[3,4];Liu, Qingyun[5];Zhu, Weihong[1,2];Tian, He[1,2];Xie, Yongshu[1,2]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, 130 Meilong, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem & Mol Engn, Feringa Nobel Prize Scientist Joint Res Ctr, 130 Meilong, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China;[4]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[5]Shandong Univ Sci & Technol, Coll Chem & Environm Engn, Qingdao, Peoples R China

年份：2019

卷号：10

期号：7

起止页码：2186

外文期刊名：CHEMICAL SCIENCE

收录：;EI(收录号：20190806520783);WOS:【SCI-EXPANDED(收录号:WOS:000458907300030)】；

基金：This work was financially supported by the Shanghai Municipal Science and Technology Major Project (Grant No. 2018SHZDZX03) and the international cooperation program of the Shanghai Science and Technology Committee (17520750100), NSFC (21472047, 21772041, 201702062, 21811530005, 21878078), Program for Professor of Special Appointment (Eastern Scholar, GZ2016006) at Shanghai Institutions of Higher Learning, Shanghai Pujiang Program (17PJ1401700), Fundamental Research Funds for the Central Universities (WK1616004, 222201717003), and Program of Introducing Talents of Discipline to Universities (B16017). The authors thank the Research Center of Analysis and Test of the East China University of Science and Technology for the help with the characterization. W. T. is grateful to the China Scholarship Council and British Council for the visiting fellowship.

语种：英文

外文关键词：Open circuit voltage - Efficiency - Strapping - Dye-sensitized solar cells - Red Shift

摘要：Porphyrin sensitizers play essential roles in the development of efficient dye-sensitized solar cells (DSSCs). To further improve power conversion efficiency (PCE), it is vital to reduce undesirable dye aggregation that causes serious charge recombination and lowered open-circuit voltages (V-oc). To this end, we herein report a new class of porphyrin-based dyes XW40 and XW41, with the porphyrin cores strapped with two circle chains. Compared with the reference sensitizer XW10 which contains a porphyrin core wrapped in four dodecoxyl chains, the double strapping in XW40 not only effectively suppresses the dye aggregation but also improves the dye loading amount. As a result, the V-oc and photocurrent (Jsc) were improved by 19 mV and 0.8 mA cm(-2), respectively, compared with the corresponding values of XW10, and the efficiency was improved from 8.6% obtained for XW10 to 9.3% for XW40. To further extend the spectral response, an electron-withdrawing benzothiadiazole (BTD) unit was introduced as an auxiliary acceptor in XW41. Impressively, the onset wavelength of its IPCE spectrum was dramatically red-shifted to 830 nm. However, the extended pi-conjugation framework results in aggravated dye aggregation, and thus a lowered efficiency of 8.2% was obtained for XW41. Through a combined approach of coadsorption and cosensitization, the efficiencies were dramatically enhanced to 10.6% and 10.2% for XW40 and XW41, respectively, as a result of simultaneously enhanced V-oc and J(sc). The results of this work provide a novel strategy for developing efficient DSSCs by employing strapped porphyrin dyes.