Styryl and phenylethynyl based coumarin chromophores for dye sensitized solar cells

• Type: Article in International Scientific Journal
• Date: 2018-02-15

Authors

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

Journal

Title: Journal of Photochemistry and Photobiology A: Chemistry

Vol. 353

Pages: 564-569

ISSN: 1010-6030

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 5 Citations

ISI Web of Science

Scopus

Associated Projects

SunStorage - Recolha e armazenamento de energia solar

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6