文献类型：期刊文献

英文题名：Fluorenyl Indoline as an Efficient Electron Donor for Concerted Companion Dyes: Enhanced Light-Harvesting and Photocurrent

作者：Chen, Yingying[1,2];Tang, Yunyu[3];Zou, Jiazhi[1,2];Zeng, Kaiwen[1,2];Baryshnikov, Glib[4];Li, Chengjie[1,2];Xie, Yongshu[1,2]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Inst Fine Chem, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[3]Chinese Acad Fishery Sci, East China Sea Fisheries Res Inst, Shanghai 200090, Peoples R China;[4]Linkoping Univ, Dept Sci & Technol, Lab Organ Elect, SE-60174 Norrkoping, Sweden

年份：2021

卷号：13

期号：42

起止页码：49828

外文期刊名：ACS APPLIED MATERIALS & INTERFACES

收录：;EI(收录号：20214411100218);WOS:【SCI-EXPANDED(收录号:WOS:000713052700021)】；

基金：This work was financially supported by the NSFC (21772041, 21971063, and 22075077), the Program of Shanghai Academic Research Leader (20XD1401400), the Natural Science Foundation of Shanghai (20ZR1414100), the Fundamental Research Funds for the Central Universities (222201717003), and the Swedish Research Council (starting grant no. 202004600). The quantum-chemical calculations were partially performed with computational resources provided by Swedish National Infrastructure for Computing (SNIC 2020-3-29) at the High-Performance Computing Center North (HPC2N) partially funded by the Swedish Research Council through (grant agreement no. 2018-05973). The authors thank the Research Center of Analysis and Test of East China University of Science and Technology for the support on the structural characterization.

语种：英文

外文关键词：porphyrin; dye-sensitized solar cells; concerted companion dyes; indoline; coadsorption

摘要：Concerted companion dyes (CC dyes) like XW61 have been demonstrated to be an effective platform for developing efficient DSSCs. However, the moderated phenothiazine-based electron donor in XW61 results in unsatisfactory J(sc). To address this problem, a stronger fluorenyl indoline-based electron donor has been used to construct porphyrin dye XW68 and organic dyes Y1-Y2. The stronger electron-donating character of the fluorenyl indoline unit leads to an enhanced J(sc) value (20.48 mA.cm(-2)) for the individual dye XW68. On this basis, CC dyes XW69-XW70-C8 have been designed and synthesized by combining the frameworks of Y1 and Y2 with XW68. The complementary absorption characters of the porphyrin and the organic dye moieties lead to panchromatic absorption with a strong light-harvesting capability from 350 to 700 nm and the onset wavelength extended to ca. 840 nm in the IPCE curves. As a result, excellent J(sc) values have been achieved (>22 mA.cm(-2)). In addition to the advantages of high J(sc), bulky octyl groups have been introduced into the donor of XW70-C8 to reduce dye aggregation and suppress charge recombination. Finally, a highest PCE of 11.1% with a satisfactory J(sc) (22.25 mA.cm(-2)) and an enhanced V-oc (750 mV) has been achieved upon coadsorption of XW70-C8 with CDCA. In addition, the CC dye XW70-C8-based solar cells exhibit excellent long-term photostability. These results provide an effective method for rationally improving the photovoltaic behavior, especially the J(sc) of CC dyes, by introducing strong electron donor moieties with suitable substituents.