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Thiophene‐based copolymers synthesized by electropolymerization for application as hole transport layer in organic solar cells
Author(s) -
Triantou Despina,
Soulis Spyridon,
Koureli Sofia,
De Sio Antonietta,
von Hauff Elizabeth
Publication year - 2012
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.37831
Subject(s) - copolymer , materials science , thiophene , organic solar cell , conductivity , polymer chemistry , doping , band gap , chemical engineering , polymer , conductive polymer , electrical resistivity and conductivity , composite material , optoelectronics , chemistry , organic chemistry , electrical engineering , engineering
Electrically conducting thiophene‐based copolymers were synthesized by electropolymerization. The potential range used has a strong influence on the film structure and properties. The extent of oxidation of the copolymers was determined from the ratio of the oxidation to reduction charge, Q ox / Q red . The use of wide potential range leads to reduced films, whereas the narrow range leads to partially oxidized films. The copolymers exhibit a characteristic band in UV–vis spectra at ∼ 410 nm, which shifts to higher wavelengths for the more doped material. The electrical conductivity of the copolymers was correlated to their morphology and their structure. The copolymer with higher conductivity is partially reduced, has compact morphology and higher ratio of quinoid to benzenoid rings. The energy gap of the copolymers is reversely proportional to their electrical conductivity. The optical and electrical properties of the copolymers make them very well suited for use as hole transport layers (HTL) in organic opto‐electronic devices. We prepared polymer : fullerene solar cells with copolymer HTLs. The solar cell performance was tested with very encouraging initial results. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013