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AC conductivity and dielectric relaxation of bulk tris (8-hydroxyquinoline) aluminum organic semiconductor

机译：本体三（8-羟基喹啉）铝有机半导体的交流电导率和介电弛豫

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摘要

The frequency dependent conductivity and dielectric behavior of bulk tris (8-hydroxyquinoline) aluminium(Ⅲ) (Alq_3) have been studied in the temperature range (293-473 K) and frequency range (10~2-5 MHz). The AC conductivity, σ_(ac), was found to be proportional to of (where co is the angular frequency). The exponent frequencies was found to be less than unity and decreased by increasing temperature. This behavior suggests that the correlated barrier hopping (CBH) model is the most predominated conduction mechanism. Both the dielectric constant ε_1 (ω) and dielectric loss ε_2 (ω) are decreased with the increase of frequency while they are increased with the increase of temperature in the investigated ranges. The complex diagram of electric modulus gives an evidence of existence of the type of Debye relaxation. The relaxation time (τ) and activation energy for relaxation (E_a) were determined.
机译：研究了在温度范围（293-473 K）和频率范围（10〜2-5 MHz）下三（8-羟基喹啉）铝（Ⅲ）（Alq_3）的频率依赖性电导率和介电行为。发现交流电导率σ_（ac）与的成正比（其中co是角频率）。发现指数频率小于1，并且随着温度升高而降低。此行为表明相关的势垒跳跃（CBH）模型是最主要的传导机制。在研究范围内，介电常数ε_1（ω）和介电损耗ε_2（ω）随频率的增加而减小，而随温度的升高而增大。电模的复数图提供了德拜弛豫类型的存在的证据。确定了弛豫时间（τ）和用于弛豫的活化能（E_a）。

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  • 来源
    《Optical and quantum electronics》 |2016年第10期|458.1-458.13|共13页
  • 作者

    M. M. El-Nahass; A. M. Farid; A. A. Atta;

  • 作者单位

    Physics Department, Faculty of Education, Ain Shams University, Roxy, Cairo 11757, Egypt;

    Physics Department, Faculty of Education, Ain Shams University, Roxy, Cairo 11757, Egypt;

    Physics Department, Faculty of Education, Ain Shams University, Roxy, Cairo 11757, Egypt ,Physics Department, Faculty of Science, Taif University, Taif 888, Kingdom of Saudi Arabia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Organic semiconductors; AC conductivity; Dielectric properties;

    机译：有机半导体;交流电导率介电性能;

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