Abstract

This study deals with the synthesis and characterization of two p-extended organic sensitizers (G1 and G2) for applications in dye-sensitized solar cells. The materials are designed with a D-A-pi-A structure constituted by i) a triarylamine group as the donor part, ii) a dithienyl-benzothiadiazole chromophore followed by iii) a further ethynylene-thiophene (G1) or ethynylene-benzene (G2) pi-spacer and iv) a cyano-acrylic moiety as acceptor and anchoring part. An unusual structural extension of the p-bridge characterizes these structures. The so-configured sensitizers exhibit a broad absorption profile, the origin of which is supported by density functional theory. The absence of hypsochromic shifts as a consequence of deprotonation as well as notable optical and electrochemical stabilities are also observed. Concerning the performances in devices, electrochemical impedance spectroscopy indicates that the structural modification of the pi-spacer mainly increases the electron lifetime of G2 with respect to G1. In devices, this feature translates into a superior power conversion efficiency of G2, reaching 8.1%. These results are comparable to those recorded for N719 and are higher with respect to literature congeners, supporting further structural engineering of the pi-bridge extension in the search for better performing pi-extended organic sensitizers.

Autore Pugliese

• Gigli Giuseppe

Tutti gli autori

• Grisorio R. , De Marco L. , Agosta R. , Iacobellis R. , Giannuzzi R. , Manca M. , Mastrorilli P. , Gigli G. , Suranna G.P.

Titolo volume/Rivista

CHEMSUSCHEM

Anno di pubblicazione

2014

ISSN

1864-5631

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

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Numero di citazioni Scopus

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Ultimo Aggiornamento Citazioni

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Settori ERC

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Codici ASJC

Non Disponibile