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Effect of π-bridge groups based on indeno[1,2-b]thiophene D–A–π–A sensitizers on the performance of dye-sensitized solar cells and photocatalytic hydrogen evolution

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Abstract

Donor–acceptor–π–acceptor (D–A–π–A) organic dyes are promising candidates for efficient dye-sensitized solar cells (DSCs) and photocatalytic H2 evolution due to their high range of visible-light response and strong light-capturing capabilities. However, the low charge transfer rate and severe charge recombination at the interface still limit their photovoltaic performance and photocatalytic activities. In this work, three indeno[1,2-b]thiophene-based sensitizers (SD1, SD2 and SD3) with a 2,3-diphenylquinoxaline (QT) auxiliary acceptor and cyclopentadithiophene (CPDT)-benzene/thiophene/furan different π-bridge moieties have been synthesized and applied in DSCs and photocatalytic H2 production to investigate the effect of the π-bridge moiety on the photovoltaic performance and photocatalytic activities. Optical/electrochemical data and density functional theory (DFT) calculations clearly showed that the introduction of a benzene π-bridge in SD1 resulted in a large torsional angle between CPDT and benzene, and then inhibited dye aggregation and charge recombination. Therefore SD1-based DSCs exhibited the highest power conversion efficiency (PCE) of 8.96% under one sun illumination. In addition, among the three sensitizers, the SD2 containing thiophene π-bridge unit exhibited the best hydrophilicity and planarity with a torsional angle <1°, which greatly improved the charge transfer process at the solution/dye/TiO2 interface and dye regeneration. Thus, a remarkable H2 evolution rate of 23.5 mmol g−1 h−1 was obtained over the SD2@Pt/TiO2 photocatalyst.

Graphical abstract: Effect of π-bridge groups based on indeno[1,2-b]thiophene D–A–π–A sensitizers on the performance of dye-sensitized solar cells and photocatalytic hydrogen evolution

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Article information


Submitted
13 Jul 2020
Accepted
21 Sep 2020
First published
24 Sep 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

Effect of π-bridge groups based on indeno[1,2-b]thiophene D–A–π–A sensitizers on the performance of dye-sensitized solar cells and photocatalytic hydrogen evolution

H. Ding, Y. Chu, M. Xu, S. Zhang, H. Ye, Y. Hu and J. Hua, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/D0TC03302B

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