Tuning of the photovoltaic parameters of molecular donors by covalent bridging

Dora Demeter, Victorien Jeux, Philippe Leriche, Philippe Blanchard, Yoann Olivier, Jérôme Cornil, Riccardo Po, Jean Roncali

Research output: Contribution to journalArticle

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. 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.

Original languageEnglish
Pages (from-to)4854-4861
Number of pages8
JournalAdvanced functional materials
Volume23
Issue number38
DOIs
Publication statusPublished - 17 Oct 2013
Externally publishedYes

Keywords

  • conjugated systems
  • molecular donors
  • organic solar cells
  • rigidification

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  • Cite this

    Demeter, D., Jeux, V., Leriche, P., Blanchard, P., Olivier, Y., Cornil, J., Po, R., & Roncali, J. (2013). Tuning of the photovoltaic parameters of molecular donors by covalent bridging. Advanced functional materials, 23(38), 4854-4861. https://doi.org/10.1002/adfm.201300427