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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 |
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container_title | Advanced functional materials |
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creator | Demeter, Dora Jeux, Victorien Leriche, Philippe Blanchard, Philippe Olivier, Yoann Cornil, Jérôme 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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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.</abstract><cop>Weinheim</cop><pub>WILEY-VCH Verlag</pub><doi>10.1002/adfm.201300427</doi><tpages>8</tpages><orcidid>https://orcid.org/0000-0002-5479-4227</orcidid><orcidid>https://orcid.org/0000-0002-9408-8108</orcidid><orcidid>https://orcid.org/0000-0003-1398-2990</orcidid><orcidid>https://orcid.org/0000-0001-9916-3827</orcidid><orcidid>https://orcid.org/0000-0002-3429-0355</orcidid></addata></record> |
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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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