INFLUENCE OF THE MOLECULAR-STRUCTURE ON THE REFRACTIVE-INDEX OF SEMICONDUCTING DI-BETA-ALKYLATED SEXITHIOPHENES

被引:9
作者
YASSAR, A
BENNOUNA, A
KHAIDAR, M
AMEZIANE, EL
HOROWITZ, G
DELABOUGLISE, D
HMYENE, M
GARNIER, F
机构
[1] CNRS,MAT MOLEC LABS,2 RUE HENRY DUNANT,F-94320 THIAIS,FRANCE
[2] UNIV CADI AYYAD,PHYS SOLIDES & COUCHES MINCES LAB,MARRAKECH,MOROCCO
关键词
D O I
10.1063/1.352052
中图分类号
O59 [应用物理学];
学科分类号
摘要
The optical absorption of thin solid films of dialkylated sexithiophene derivatives (2A6T) has been measured at incident energies below the fundamental absorption edge, where these semiconducting organic materials are transparent. The absorption spectra present interference patterns that have been used for determining their refractive index n. A value of 1.904 was measured on unsubstituted sexithiophene. Alkyl substitution leads to a decrease of n, which is more pronounced as the alkyl chain length increases. This behavior is attributed to the corresponding decrease of the density of the material. Our data are compared to other experimental determinations of the optical parameters of thiophene oligomers and polymers published to date.
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页码:4873 / 4876
页数:4
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