Styryl and phenylethynyl based coumarin chromophores for dye sensitized solar cells

• Tipo: Artigo em Revista Científica Internacional
• Data: 2018-02-15

Autores

Sérgio Martins (Autor) Outra; João Avó (Autor) Outra; João Lima (Autor) Outra; Josá Nogueira (Autor) Outra; Luísa Andrade (Autor) FEUP; Adélio Mendes (Autor) FEUP; António Pereira (Autor) Outra; Paula S. Branco (Autor) Outra

Revista

Título: Journal of Photochemistry and Photobiology A: Chemistry

Vol. 353

Páginas: 564-569

ISSN: 1010-6030

Editora: Elsevier

Indexação

ISI Web of Knowledge - 5 Citações

ISI Web of Science

Scopus

Projetos Associados

SunStorage - Recolha e armazenamento de energia solar

Outras Informações

ID Authenticus: P-00N-JX4

DOI: 10.1016/j.jphotochem.2017.12.018

Abstract (EN): A set of coumarin dyes with styryl and phenylethynyl pi-bridge at the 3-position were tested for dye sensitized solar cells (DSSCs). The natural product 6,7-dihydroxycoumarin (Esculetin) was used as starting material. Crucial steps for extension of the conjugated system involved Sonogashira and regioselective Heck arylation reactions, yielding highly fluorescent molecules. The photophysical characterization showed that the extension of conjugation via the alkynyl bridge resulted in redshifted absorption and emission spectra relatively to the parent compound. Electrochemical studies revealed that this derivatization resulted in a marked decrease in HOMO energy levels, which had a marked effect on sensitized solar cell performance. The overall conversion efficiency of the phenylethynyl derivatives proved to be significantly superior (ca. 45%) to the vinyl derivatives, with 6a showing a 2% conversion.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 6