Improved light harvesting via energy transfer within a benzothiadiazole-based antenna–sensitizer dyad for dye-sensitized solar cells

Rossella Infantino; Elena Ermini; Carmen Coppola; Irene Motta; Gregorio Bottaro; Lidia Armelao; Adalgisa Sinicropi; Alessandro Mordini; Gianna Reginato; Massimo Calamante; Lorenzo Zani; Daniele Franchi; Alessio Dessì

doi:10.1039/D5CC02692J

Improved light harvesting via energy transfer within a benzothiadiazole-based antenna–sensitizer dyad for dye-sensitized solar cells†

Rossella Infantino,

‡§^a Elena Ermini,

‡^ab Carmen Coppola,

^acd Irene Motta,

^ef Gregorio Bottaro,

^ef Lidia Armelao,^eg Adalgisa Sinicropi,

^acd Alessandro Mordini,

^ab Gianna Reginato,

^a Massimo Calamante,

^ab Lorenzo Zani,

^a Daniele Franchi

*^a and Alessio Dessì

*^a

Author affiliations

* Corresponding authors

^a CNR-ICCOM, Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
E-mail: daniele.franchi@cnr.it, alessio.dessi@cnr.it

^b Department of Chemistry “U. Schiff”, University of Florence, Via della Lastruccia 13, 50019 Sesto Fiorentino, Italy

^c Department of Biotechnology, Chemistry and Pharmacy, R2ES Lab, University of Siena, Via A. Moro 2, 53100 Siena, Italy

^d CSGI, Consorzio per lo Sviluppo dei Sistemi a Grande Interfase, Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy

^e Department of Chemical Sciences, University of Padua, Via F. Marzolo 1, 35131 Padua, Italy

^f CNR-ICMATE, c/o Department of Chemical Sciences, University of Padua, Via F. Marzolo 1, 35131 Padua, Italy

^g Department of Chemical Sciences and Materials Technologies (DSCTM), National Research Council, P.le A. Moro 7, 00185 Rome, Italy

Abstract

We describe the design, synthesis and application in dye-sensitized solar cells (DSSCs) of a fully organic dyad consisting of a visible light-harvesting D–A–π–A dye covalently linked to a small antenna that can absorb higher energy photons. Thanks to its precise molecular design, not previously applied in DSSCs, the dyad showed an excellent overlap between the antenna emission spectrum and the dye absorption spectrum, providing a high energy transfer efficiency of 88%, which is among the best reported for such systems. Cells featuring the dyad as a sensitizer showed increased light-harvesting efficiency compared to those built with a reference dye without the antenna, resulting in a 35% higher average power conversion efficiency.

This article is part of the themed collection: Chemistry at the Forefront of the Sustainable Energy Transition

Chemical Communications

Improved light harvesting via energy transfer within a benzothiadiazole-based antenna–sensitizer dyad for dye-sensitized solar cells†

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