Absorption studies of charged excitations in α-sexithiophene

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Publication Type Journal Article
School or College College of Science
Department Physics
Creator Vardeny, Zeev Valentine
Other Author Lane, P. A.; Wei, X.; Poplawski, J.; Ehrenfreund, E.; Ibrahim, M.; Frank, A. J.
Title Absorption studies of charged excitations in α-sexithiophene
Date 1996
Description We present photoexcitation studies of vacuum deposited neutral films of α,ω-substituted sexithiophene (α-6T) using photoinduced absorption (PA) and PAdetected magnetic resonance spectroscopy (PADMR). We find evidence for photoinduced polarons having spin 1/2, with two absorption bands at 0.80 and 1.54 eV, respectively, and with negative PADMR signal at g ≈2. Similar absorption bands are observed in lightly p-doped sexithiophene and are interpreted as due to 6T*+ radical cations. In addition, a PA band is found at 1.1 eV, which is shorter lived and decreases faster with increasing temperature than the polaron bands. As similar dication bands (6T2+) have been found in heavily-doped α-6T, we identify this band as due to spinless bipolarons. Evidence of charge conjugation symmetry breaking in α-6T is presented. Finally, we have identified triplet excitons with triplet-triplet transition energy at about 1.45 eV.
Type Text
Publisher Society of Plastics Engineers
Subject alpha- sexithiophene; Charged excitations; Photoexcitation; Photoinduced absorption
Subject LCSH Thiophenes -- Optical properties
Language eng
Bibliographic Citation Lane, P. A., Wei, X., Vardeny, Z. V., Poplawski, J., Ehrenfreund, E., Ibrahim, M., & Frank, A. J. (1996). Absorption studies of charged excitations in α-sexithiophene. ANTEC, 96, 1338.
Rights Management (c)Society of Plastics Engineers
Format Medium application/pdf
Format Extent 348,839 bytes
Identifier ir-main,9813
ARK ark:/87278/s6v98snf
Setname ir_uspace
Date Created 2012-06-13
Date Modified 2021-05-06
ID 706459
Reference URL https://collections.lib.utah.edu/ark:/87278/s6v98snf
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