HIGH-RESOLUTION ELECTRON-ENERGY-LOSS SPECTROSCOPY STUDIES ON THE ELECTRONIC-STRUCTURE OF QUINQUETHIOPHENE (5T) AND SEXITHIOPHENE (6T) FILMS

Authors
PELLEGRINO O VILAR MR HOROWITZ G KOUKI F GARNIER F DASILVA JDL DOREGO AMB
Citation
O. Pellegrino et al., HIGH-RESOLUTION ELECTRON-ENERGY-LOSS SPECTROSCOPY STUDIES ON THE ELECTRONIC-STRUCTURE OF QUINQUETHIOPHENE (5T) AND SEXITHIOPHENE (6T) FILMS, Thin solid films, 329, 1998, pp. 291-294
Citations number
11
Categorie Soggetti
Physics, Applied","Material Science","Physics, Condensed Matter
Journal title
Thin solid films → ACNP
ISSN journal
00406090
Volume
329
Year of publication
1998
Pages
291 - 294
Database
ISI
SICI code
0040-6090(1998)329:<291:HESSOT>2.0.ZU;2-A
Abstract
High-resolution electron energy loss spectroscopy (HREELS) and optical absorption spectra were recorded for 5- and 6-thiophene films. These compounds are characterized by a large excitonic band of u symmetry. O ptical transitions are only allowed to the high-energy edge (top) of t his band. Due to different selection rules, HREELS spectra reveal tran sitions to the low-energy edge (bottom) of the exciton band, and allow a precise determination of the excitonic gap. Furthermore, a second t hreshold above 3 eV is tentatively assigned to the electronic gap. (C) 1998 Elsevier Science S.A. All rights reserved.