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Small Molecular Donors for Organic Solar Cells Obtained by Simple and Clean Synthesis
Author(s) -
Demeter Dora,
Mohamed Salma,
Diac Andreea,
Grosu Ion,
Roncali Jean
Publication year - 2014
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201301339
Subject(s) - organic solar cell , cyclic voltammetry , knoevenagel condensation , chemistry , acceptor , energy conversion efficiency , absorption spectroscopy , bilayer , molecular orbital , molecule , absorption (acoustics) , photochemistry , analytical chemistry (journal) , materials science , organic chemistry , electrochemistry , optoelectronics , catalysis , optics , electrode , biochemistry , physics , composite material , membrane , condensed matter physics , polymer
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 λ max , 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 mm 2 active area using C 60 as acceptor gave a short‐circuit current density of 6.32 mA cm −2 and a power conversion efficiency of 2.07 %.