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Effect of fluorine substituents on benzothiadiazole-based D-π-A'-π-A photosensitizers for dye-sensitized solar cells. | LitMetric

Effect of fluorine substituents on benzothiadiazole-based D-π-A'-π-A photosensitizers for dye-sensitized solar cells.

RSC Adv

Institute of Artificial Photosynthesis, State Key Laboratory of Fine Chemicals, DUT-KTH Joint Education and Research Centre on Molecular Devices, Dalian University of Technology (DUT) 2 Linggong Rd 116024 Dalian China.

Published: March 2020

AI Article Synopsis

Article Abstract

Two D-π-A'-π-A organic dyes with triazatruxene (TAT) as the electron donor, thiophene as the π-spacer, benzoic acid as the anchor group, and benzothiadiazole (BT) or difluorobenzo[][1,2,5]thiadiazole (DFBT) as the additional acceptor, namely LS101 and LS102, respectively, were applied to dye-sensitized solar cells (DSSCs). As fluorine substituents are usually strong electron-withdrawing groups, introducing two fluorine atoms into BT was expected to strengthen the electron-withdrawing ability of the auxiliary acceptor, resulting in DSSCs with a broader light capture region and further improved power conversion efficiency (PCE). Fluorine is the smallest electron-withdrawing group with an induction effect, but can also act as an electron-donating group owing to its conjugation effect. When the conjugation effect is dominant, the electron-withdrawing ability of additional acceptor DFBT decreases instead. Accordingly, the band gap of LS102 was broadened and the UV-vis absorption spectrum was blue-shifted. In the end, DSSCs based on LS101 achieved a champion PCE of 10.2% ( = 15.1 mA cm, = 966 mV, FF = 70.1%) while that based on LS102 gave a PCE of only 8.6% ( = 13.4 mA cm, = 934 mV, FF = 69.1%) under standard AM 1.5G solar irradiation (100 mW cm) with Co/Co as the electrolyte.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9050066PMC
http://dx.doi.org/10.1039/c9ra09693kDOI Listing

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