High-resolution electron energy loss spectroscopy studies on the electronic structure of quinquethiophene (5T) and sexithiophene (6T) films

被引：9
|
作者：
Pellegrino, O
Vilar, MR
Horowitz, G
Kouki, F
Garnier, F
da Silva, JDL
do Rego, AMB
机构：
[1] CNRS, Lab Dynam Interact & Reactiv, F-94320 Thiais, France
[2] Univ Tecn Lisboa, Ctr Quim Fis Mol, Inst Super Tecn, P-1096 Lisbon, Portugal
[3] CNRS, Mat Mol Lab, F-94320 Thiais, France
来源：
THIN SOLID FILMS | 1998年 / 327卷
关键词：
conducting polymers; high-resolution electron energy loss spectroscopy (HREELS); UV-vis spectrum; thiophene oligomer;
D O I：
10.1016/S0040-6090(98)00647-6
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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. Optical transitions are only allowed to the high-energy edge (top) of this band. Due to different selection rules, HREELS spectra reveal transitions to the low-energy edge (bottom) of the exciton band, and allow a precise determination of the excitonic gap. Furthermore, a second threshold above 3 eV is tentatively assigned to the electronic gap. (C) 1998 Elsevier Science S.A. All rights reserved.
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页码：291 / 294
页数：4
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