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Tuning of the Photovoltaic Parameters of Molecular Donors by Covalent Bridging

The synthesis of donor‐acceptor molecules involving triarylamines and dicyanovinyl blocks is described. Optical and electrochemical results show that rigidification of the acceptor part of the molecule by a covalent bridge leads to a ca. 0.20 eV increase of the band gap due to a parallel increase of...

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Published in:Advanced functional materials 2013-10, Vol.23 (38), p.4854-4861
Main Authors: Demeter, Dora, Jeux, Victorien, Leriche, Philippe, Blanchard, Philippe, Olivier, Yoann, Cornil, Jérôme, Po, Riccardo, Roncali, Jean
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cited_by cdi_FETCH-LOGICAL-c4277-47987d98b27ccbf6ea1ed81086e2f0dbfea33020e48d02bf42fadcea66771cda3
cites cdi_FETCH-LOGICAL-c4277-47987d98b27ccbf6ea1ed81086e2f0dbfea33020e48d02bf42fadcea66771cda3
container_end_page 4861
container_issue 38
container_start_page 4854
container_title Advanced functional materials
container_volume 23
creator Demeter, Dora
Jeux, Victorien
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Po, Riccardo
Roncali, Jean
description The synthesis of donor‐acceptor molecules involving triarylamines and dicyanovinyl blocks is described. Optical and electrochemical results show that rigidification of the acceptor part of the molecule by a covalent bridge leads to a ca. 0.20 eV increase of the band gap due to a parallel increase of the lowest unoccupied molecular orbital level. A preliminary evaluation of these compounds as donor materials in organic solar cells shows that although this structural modification reduces the light‐harvesting properties of the donor molecule, it nevertheless induces an increase of the efficiency of the resulting solar cells due to a simultaneous improvement of the open‐circuit voltage and fill factor. Covalent bridging of the dicyanovinyl group with the adjacent thiophene ring of small push‐pull molecular donors based on triarylamines leads to a significant improvement of the efficiency of the resulting organic solar cells due to the simultaneous increase of the fill factor and open‐circuit voltage.
doi_str_mv 10.1002/adfm.201300427
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subjects Chemical Sciences
conjugated systems
molecular donors
organic solar cells
rigidification
title Tuning of the Photovoltaic Parameters of Molecular Donors by Covalent Bridging
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