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Tuning of the Photovoltaic Parameters of Molecular Donors by Covalent Bridging |
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| Authors: | Dora Demeter Victorien Jeux Philippe Leriche Philippe Blanchard Yoann Olivier Jérôme Cornil Riccardo Po Jean Roncali |
| Affiliation: | 1. Group Linear Conjugated Systems, CNRS UMR 6200, MOLTECH‐Anjou, University of Angers 2 Bd Lavoisier, 49045 Angers, France;2. Laboratory for Chemistry of Novel Materials, University of Mons, Place du Parc, 7000, Mons, Belgium;3. Centro ricerche per le energie non convenzionali Istituto, ENI Donegani ENI S.p.A., via G. Fauser 4, 28100 Novara, Italy |
| Abstract: | 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. |
| Keywords: | organic solar cells molecular donors conjugated systems rigidification |