Small Molecular Donors for Organic Solar Cells Obtained by Simple and Clean Synthesis

Authors

  • Dora Demeter,

    1. Group Linear Conjugated Systems, CNRS, Moltech-Anjou, University of Angers, 2 Bd Lavoisier 49045 Angers (France)
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  • Salma Mohamed,

    1. Group Linear Conjugated Systems, CNRS, Moltech-Anjou, University of Angers, 2 Bd Lavoisier 49045 Angers (France)
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  • Andreea Diac,

    1. Group Linear Conjugated Systems, CNRS, Moltech-Anjou, University of Angers, 2 Bd Lavoisier 49045 Angers (France)
    2. Babes Bolyai University, Center of Supramolecular Organic and Organometallic Chemistry (CSOOMC), Cluj-Napoca, 11 Arany Janos St., 400028 Cluj-Napoca (Romania)
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  • Ion Grosu,

    1. Babes Bolyai University, Center of Supramolecular Organic and Organometallic Chemistry (CSOOMC), Cluj-Napoca, 11 Arany Janos St., 400028 Cluj-Napoca (Romania)
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  • Jean Roncali

    Corresponding author
    1. Group Linear Conjugated Systems, CNRS, Moltech-Anjou, University of Angers, 2 Bd Lavoisier 49045 Angers (France)
    • Group Linear Conjugated Systems, CNRS, Moltech-Anjou, University of Angers, 2 Bd Lavoisier 49045 Angers (France)===

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Abstract

A small donor–acceptor molecule is synthesized in a two-step procedure involving reaction of N,N-diphenylhydrazine on 2,5-diformylthiophene and Knoevenagel condensation. Results of UV/Vis absorption spectroscopy and cyclic voltammetry show that replacement of the phenyl ring bridge of a reference compound 2 by an azo group produces a slight red-shift of λmax, an enhancement of the molecular absorption coefficient, and a decrease of the energy level of the frontier orbitals. A preliminary evaluation of the potentialities of compound 1 as donor material in a basic bilayer planar heterojunction cell of 28 mm2 active area using C60 as acceptor gave a short-circuit current density of 6.32 mA cm−2 and a power conversion efficiency of 2.07 %.

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