Selenorhodamine Dye-Sensitized Solar Cells: Influence of Structure and Surface-Anchoring Mode on Aggregation, Persistence, and Photoelectrochemical Performance

Langmuir : the ACS Journal of Surfaces and Colloids
Mark W KrymanMichael R Detty

Abstract

A library of six selenorhodamine dyes (4-Se-9-Se) were synthesized, characterized, and evaluated as photosensitizers of TiO2 in dye-sensitized solar cells (DSSCs). The dyes were constructed around either a bis(julolidyl)- or bis(half-julolidyl)-modified selenoxanthylium core functionalized at the 9-position with a thienyl group bearing a carboxylic, hydroxamic, or phosphonic acid for attachment to TiO2. Absorption bands of solvated dyes 4-Se-9-Se were red-shifted relative to the dimethylamino analogues. The dyes adsorbed to TiO2 as mixtures of monomeric and H-aggregated dyes, which exhibited broadened absorption spectra and increased light-harvesting efficiencies relative to the solvated monomeric dyes. Carboxylic acid-bearing dyes 4-Se and 7-Se initially exhibited the highest incident photon-to-current efficiencies (IPCEs) of 65-80% under monochromatic illumination, but the dyes desorbed rapidly from TiO2 into solutions of HCl (0.1 M) in a CH3CN:H2O mixed solvent (120:1 v:v). The hydroxamic acid- and phosphonic acid-bearing dyes 5-Se, 6-Se, 8-Se, and 9-Se exhibited lower IPCEs (49-65%) immediately after preparation of DSSCs; however, the dyes were vastly more inert on TiO2, and IPCEs decreased only minimally with successive me...Continue Reading

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Citations

Oct 3, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Fang XuXueqin Zhou
Apr 21, 2018·ACS Applied Materials & Interfaces·Vellimalai PunitharasuJayaraj Nithyanandhan
Aug 10, 2018·Journal of the American Chemical Society·Zachary Piontkowski, David W McCamant
Jul 18, 2018·ACS Applied Materials & Interfaces·Rajesh BishtJayaraj Nithyanandhan
Dec 3, 2021·Inorganic Chemistry·Harrison A MillsAlexander M Spokoyny

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