Enhancing dye-sensitized solar cell performances by molecular engineering: highly efficient π-extended organic sensitizers
| Autor: | Piero Mastrorilli, Roberto Grisorio, Roberto Giannuzzi, Rosabianca Iacobellis, Michele Manca, Giuseppe Gigli, Luisa De Marco, Gian Paolo Suranna, Rita Agosta |
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| Přispěvatelé: | Grisorio, Roberto, De Marco, Luisa, Agosta, Rita, Iacobellis, Rosabianca, Giannuzzi, Roberto, Manca, Michele, Mastrorilli, Piero, Gigli, Giuseppe, Suranna Gian, Paolo |
| Rok vydání: | 2014 |
| Předmět: |
Models
Molecular General Chemical Engineering Molecular Conformation Benzothiadiazole dye sensitized solar cell light-harvesting structure-property relationship pi-extended organic sensitizer Photochemistry 7. Clean energy Molecular engineering Electron Transport Electric Power Supplies Engineering Thiadiazoles Electrochemistry Solar Energy Environmental Chemistry Moiety General Materials Science Coloring Agents Chemistry Chromophore Acceptor Dielectric spectroscopy Dye-sensitized solar cell General Energy Hypsochromic shift Density functional theory |
| Zdroj: | ChemSusChem ChemSusChem (Weinh., Print) 7 (2014): 2659–2669. doi:10.1002/cssc.201402164 info:cnr-pdr/source/autori:Grisorio, Roberto; De Marco, Luisa; Agosta, Rita; Iacobellis, Rosabianca; Giannuzzi, Roberto; Manca, Michele; Mastrorilli, Piero; Gigli, Giuseppe; Suranna, Gian Paolo/titolo:Enhancing Dye-Sensitized Solar Cell Performances by Molecular Engineering: Highly Efficient pi-Extended Organic Sensitizers/doi:10.1002%2Fcssc.201402164/rivista:ChemSusChem (Weinh., Print)/anno:2014/pagina_da:2659/pagina_a:2669/intervallo_pagine:2659–2669/volume:7 |
| ISSN: | 1864-564X |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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