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Osmium sensitizer with enhanced spin–orbit coupling for panchromatic dye-sensitized solar cells

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Abstract

Low-lying triplet metal-to-ligand charge transfer (3MLCT) transitions of osmium complexes induced by spin–orbit coupling (SOC) are promising for extending the photocurrent response in dye-sensitized solar cells. In this study, we present a new osmium complex (CYC-33O), incorporating a 2-thiohexyl-3,4-ethylenedioxythiophene functionalized bipyridyl ancillary ligand to red-shift the absorption and enhance the absorbance of singlet and triplet metal-to-ligand charge transfer (1MLCT and 3MLCT) transitions. Time-dependent density functional theory (TDDFT) calculations show that the reinforced 1MLCT and 3MLCT transitions of CYC-33O are mainly from osmium to the 4,4′,4′′-tricarboxy-2,2′:6′,2′′-terpyridine anchoring ligand, increasing the heterogeneous electron transfer between CYC-33O and TiO2. The device sensitized with CYC-33O exhibits panchromatic conversion beyond 1000 nm, yielding a photocurrent density of 19.38 mA cm−2, which is much higher than those of the cells based on the ruthenium analogue (CYC-33R) and model osmium complex (Os-3) sensitizers.

Graphical abstract: Osmium sensitizer with enhanced spin–orbit coupling for panchromatic dye-sensitized solar cells

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Supplementary files

Article information


Submitted
16 Dec 2019
Accepted
24 Mar 2020
First published
25 Mar 2020

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

Osmium sensitizer with enhanced spin–orbit coupling for panchromatic dye-sensitized solar cells

R. Juwita, J. Lin, S. Lin, Y. Liu, T. Wu, Y. Feng, C. Chen, H. Gavin Tsai and C. Wu, J. Mater. Chem. A, 2020, Advance Article , DOI: 10.1039/C9TA13782C

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