Dispersive electron transport in tris(8-hydroxyquinoline) aluminum (Alq3) probed by impedance spectroscopy -: art. no. 286601

被引：129
作者：
Berleb, S [1 ]
Brütting, W [1 ]
机构：
[1] Univ Bayreuth, D-95440 Bayreuth, Germany
来源：
PHYSICAL REVIEW LETTERS | 2002年 / 89卷 / 28期
关键词：
D O I：
10.1103/PhysRevLett.89.286601
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Electron transport in tris(8-hydroxyquinoline) aluminum (Alq(3)) is investigated by impedance spectroscopy under conditions of space-charge limited conduction (SCLC). Existing SCLC models are extended to include the field dependence of the charge carrier mobility and energetically distributed trap states. The dipersive nature of electron transport is revealed by a frequency-dependent mobility with a dispersion parameter alpha in the range 0.4-0.5, independent of temperature. This indicates that positional rather than energetic disorder is the dominant mechanism for the dispersive transport of electrons in Alq(3).
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