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

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 co...

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Bibliographic Details
Published in:ChemSusChem 2014-04, Vol.7 (4), p.1046-1050
Main Authors: Demeter, Dora, Mohamed, Salma, Diac, Andreea, Grosu, Ion, Roncali, Jean
Format: Article
Language:English
Subjects:
Chemical Sciences
Chemistry Techniques, Synthetic
condensations
donor-acceptor
Electric Power Supplies
Electrochemistry
energy conversion
Green Chemistry Technology
Photovoltaic cells
photovoltaics
solar cells
Solar Energy
Thiophenes - chemical synthesis
Thiophenes - chemistry
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Summary: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 %. Keep it simple: A simple donor–acceptor molecule is synthesized from 2,5‐thiophene dialdehyde using two condensation reactions with water as sole by‐product. A 30 mm2 simple bilayer solar cell fabricated with a spun‐cast film of donor and vacuum‐deposited C60 shows a power conversion efficiency >2.0 % under simulated solar light.
ISSN:1864-5631
1864-564X
DOI:10.1002/cssc.201301339