Journal article
Long-lived photoexcitations in α-hexathiophene single crystals
Synthetic metals, Vol.116(1), pp.181-184
01/01/2001
DOI: 10.1016/S0379-6779(00)00482-3
Abstract
We employed various steady-state spectroscopic techniques, such as absorption, photoluminescence, photoinduced absorption (PA) and PA-detected magnetic resonance (PADMR), to study long-lived photoexcitations in α-hexathiophene single crystals. The lowest lying absorption band appears at 2.4
eV and is polarized along the oligomer chains (ac-polarized), whereas the photoluminescence is largely unpolarized. The PA spectrum, recorded from ℏ
ω=0.6 to 1.8
eV, is relatively weak and shows three bands at 0.75, 1.25 and 1.6
eV, respectively, where the 1.6
eV band is by far the most intense. All three PA bands are ac-polarized. Using PADMR we identify the 1.25
eV band as due to bipolarons, and show that the 0.75
eV band is due to spin 1/2 polarons. For the triplet exciton we found a broad PADMR band centered at 1.6
eV with 1
eV total width.
Details
- Title: Subtitle
- Long-lived photoexcitations in α-hexathiophene single crystals
- Creators
- M. Wohlgenannt - University of UtahZ.V. Vardeny - University of UtahS.V. Frolov - Alcatel-LucentCh Kloc - Alcatel-LucentB. Batlogg - Alcatel-Lucent
- Resource Type
- Journal article
- Publication Details
- Synthetic metals, Vol.116(1), pp.181-184
- Publisher
- Elsevier B.V
- DOI
- 10.1016/S0379-6779(00)00482-3
- ISSN
- 0379-6779
- eISSN
- 1879-3290
- Language
- English
- Date published
- 01/01/2001
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984429033302771
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