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.

Enhancing Dye-Sensitized Solar Cell Performances by Molecular Engineering: Highly Efficient π-Extended Organic Sensitizers / Grisorio, Roberto; De marco, Luisa; Agosta, Rita; Iacobellis, Rosabianca; Giannuzzi, Roberto; Manca, Michele; Mastrorilli, Pietro; Gigli, Giuseppe; Suranna, Gian Paolo. - In: CHEMSUSCHEM. - ISSN 1864-5631. - 7:9(2014), pp. 2659-2669. [10.1002/cssc.201402164]

Enhancing Dye-Sensitized Solar Cell Performances by Molecular Engineering: Highly Efficient π-Extended Organic Sensitizers

Roberto Grisorio;MASTRORILLI, Pietro;SURANNA, Gian Paolo
2014-01-01

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.
2014
Enhancing Dye-Sensitized Solar Cell Performances by Molecular Engineering: Highly Efficient π-Extended Organic Sensitizers / Grisorio, Roberto; De marco, Luisa; Agosta, Rita; Iacobellis, Rosabianca; Giannuzzi, Roberto; Manca, Michele; Mastrorilli, Pietro; Gigli, Giuseppe; Suranna, Gian Paolo. - In: CHEMSUSCHEM. - ISSN 1864-5631. - 7:9(2014), pp. 2659-2669. [10.1002/cssc.201402164]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/659
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