http://www.cnr.it/ontology/cnr/individuo/prodotto/ID260806

Anchoring stability and photovoltaic properties of new D(-pi-A)(2) dyes for dye-sensitized solar cell applications (Articolo in rivista)

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Anchoring stability and photovoltaic properties of new D(-pi-A)(2) dyes for dye-sensitized solar cell applications (Articolo in rivista) (literal)

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Alternative label

Grisorio R. [ 1 ] ; De Marco L. [ 2 ] ; Allegretta G. [ 1 ] ; Giannuzzi R. [ 2 ] ; Suranna G. P. [ 1 ] ; Manca M. [ 2 ] ; Mastrorilli P. [ 1,3 ] ; Gigli G. [ 2,4,5 ] (2013)
Anchoring stability and photovoltaic properties of new D(-pi-A)(2) dyes for dye-sensitized solar cell applications
in Dyes and pigments; ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON (Regno Unito)
(literal)

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Grisorio R. [ 1 ] ; De Marco L. [ 2 ] ; Allegretta G. [ 1 ] ; Giannuzzi R. [ 2 ] ; Suranna G. P. [ 1 ] ; Manca M. [ 2 ] ; Mastrorilli P. [ 1,3 ] ; Gigli G. [ 2,4,5 ] (literal)

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[ 1 ] DICATECh, I-70125 Bari, Italy [ 2 ] Fdn Ist Italian Tecnol IIT, CBN, I-73010 Arnesano, Italy [ 3 ] CNR Firenze, Area Ric, Ist Chim Composti Organometall, I-50019 Florence, Italy [ 4 ] CNR, NNL Ist Nanosci, Dist Tecnol Lecce, I-73100 Lecce, Italy [ 5 ] Univ Salento, Dept Math & Phys E De Giorgi, I-73100 Lecce, Italy (literal)

Titolo

Anchoring stability and photovoltaic properties of new D(-pi-A)(2) dyes for dye-sensitized solar cell applications (literal)

Abstract

This study deals with the synthesis and characterization of two new di-anchoring dyes for applications in dye-sensitized solar cells. The materials were designed with a branched D(-pi-A)(2) structure containing (i) a rigid alkyl-functionalized carbazole core as the donor part, (ii) one (DYE1) or two (DYE2) thiophene units as the pi-bridge and (iii) a cyano-acrylic moiety as acceptor and anchoring part. Electrochemical impedance spectroscopy indicated that the injected electron lifetime is higher in the case of DYE2, probably due to the length of the pi-spacer that, in combination with the alkyl chain on the carbazole unit, hampers the charge recombination with the electrolyte. Stability tests on TiO2-sensitized films revealed that the di-anchoring remarkably slows down the desorption process, which conversely is evident for classic reference dyes. The highest power conversion efficiency reaches 5.01% in the case of DYE2 with a photovoltage of 0.70 V and a photocurrent of 10.52 mA cm(-2), substantially deriving from a broader absorption with respect to DYE1, as also confirmed by IPCE measurements. These results support the efforts aimed at the structural engineering of D(-pi-A)(2) dyes to design new, more efficient and stable organic sensitizers. (literal)

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