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New cyclic and acyclic imidazole-based sensitizers for achieving highly efficient photoanodes for dye-sensitized solar cells by a potential-assisted method

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Abstract

A series of systematically tailored aryl acyclic (biphenyl, dye 1 and 2), cyclic (phenanthrene, dye 3 and 4) and methyl-substituted (dye 5) imidazole derivatives were synthesized and characterized for application in dye-sensitized solar cells (DSSCs). The anisole ancillary donor was attached to the –NH position in the imidazole center to obtain dyes 2 and 4. Cyclic voltammetry and UV-visible studies of all the dyes indicate their suitability for DSSC applications. Among the as-synthesized dyes, dye 4 with a phenanthrene donor and anisole ancillary donor showed the highest power conversion efficiency (PCE) of 7.16% (JSC = 13.07 mA cm−2, VOC = 0.831 V, FF = 0.659). Dye 2 displayed the highest electron lifetime in the conduction band of the photoanode; hence, the open circuit voltage of the DSSC based on dye 2 was the highest among the studied dyes (0.865 V). By using a novel potential-assisted dye staining process, the dye loading on the photoanode was enhanced by 18% in 1 h, which in turn enhanced the PCE to 8.10%.

Graphical abstract: New cyclic and acyclic imidazole-based sensitizers for achieving highly efficient photoanodes for dye-sensitized solar cells by a potential-assisted method

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Supplementary files

Article information


Submitted
11 Jan 2020
Accepted
30 Mar 2020
First published
31 Mar 2020

New J. Chem., 2020, Advance Article
Article type
Paper

New cyclic and acyclic imidazole-based sensitizers for achieving highly efficient photoanodes for dye-sensitized solar cells by a potential-assisted method

J. Sivanadanam, I. S. Aidhen and K. Ramanujam, New J. Chem., 2020, Advance Article , DOI: 10.1039/D0NJ00137F

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