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Synthetic Efforts to Investigate the Effect of Planarizing the Triarylamine Geometry in Dyes for Dye-Sensitized Solar Cells.
Almenningen, David Moe; Engh, Veslemøy Minge; Strømsodd, Eivind Andreas; Hansen, Henrik Erring; Buene, Audun Formo; Hoff, Bård Helge; Gautun, Odd Reidar.
Afiliação
  • Almenningen DM; Department of Chemistry, Norwegian University of Science and Technology, Høgskoleringen 5, 7491 Trondheim, Norway.
  • Engh VM; Department of Chemistry, Norwegian University of Science and Technology, Høgskoleringen 5, 7491 Trondheim, Norway.
  • Strømsodd EA; Department of Chemistry, Norwegian University of Science and Technology, Høgskoleringen 5, 7491 Trondheim, Norway.
  • Hansen HE; Department of Materials Science and Engineering, Norwegian University of Science and Technology, Sem Sælands vei 12, 7491 Trondheim, Norway.
  • Buene AF; Department of Civil and Environmental Engineering, Norwegian University of Science and Technology, Høgskoleringen 7a, 7034 Trondheim, Norway.
  • Hoff BH; Department of Chemistry, Norwegian University of Science and Technology, Høgskoleringen 5, 7491 Trondheim, Norway.
  • Gautun OR; Department of Chemistry, Norwegian University of Science and Technology, Høgskoleringen 5, 7491 Trondheim, Norway.
ACS Omega ; 7(25): 22046-22057, 2022 Jun 28.
Article em En | MEDLINE | ID: mdl-35785284
ABSTRACT
The geometry of a dye for dye-sensitized solar cells (DSSCs) has a major impact on its optical and electronic properties. The dye structure also dictates the packing properties and how well the dye insulates the metal-oxide surface from oxidants in the electrolyte. The aim of this work is to investigate the effect of planarizing the geometry of the common triarylamine donor, frequently used in dyes for DSSC. Five novel dyes were designed and prepared; two employ conventional triarylamine donors with thiophene and furan π-spacers, two dyes have had their donors planarized through one sulfur bridge (making two distinct phenothiazine motifs), and the final dye has been planarized by forming a double phenoxazine. The synthesis of these model dyes proved to be quite challenging, and each required specially designed total syntheses. We demonstrate that the planarization of the triarylamine donor can have different effects. When planarization was achieved by a 3,7-phenothiazine and double phenoxazine structures, improved absorption properties were noted, and a panchromatic absorption was achieved by the latter. However, an incorrect linking of donor and acceptor moieties has the opposite effect. Further, electrochemical impedance spectroscopy revealed clear differences in charge recombination depending on the structure of the dye. A drawback of planarized dyes in relation to DSSC is their low oxidation potentials. The best photovoltaic performance was achieved by 3,7-phenothazine with furan as a π-spacer, which produces a power conversion efficiency of 5.2% (J sc = 8.8 mA cm-2, V oc = 838 mV, FF = 0.70).

Texto completo: 1 Bases de dados: MEDLINE Idioma: En Revista: ACS Omega Ano de publicação: 2022 Tipo de documento: Article País de afiliação: Noruega

Texto completo: 1 Bases de dados: MEDLINE Idioma: En Revista: ACS Omega Ano de publicação: 2022 Tipo de documento: Article País de afiliação: Noruega