影像科学与光化学 ›› 1987, Vol. 5 ›› Issue (4): 1-5.DOI: 10.7517/j.issn.1674-0475.1987.04.1

• 研究论文 •    下一篇

α-CuPc/PVK体系光电性能的研究

周淑琴, 金祥凤   

  1. 中国科学院化学研究所 北京
  • 收稿日期:1986-08-25 修回日期:1987-01-05 出版日期:1987-11-20 发布日期:1987-11-20
  • 基金资助:
    中国科学院自然科学基金

PHOTOCONDUCTIVITY OF α-CuPc/PVK

ZHOU SHU-QIN, JIN XIANG-FENG   

  1. Institute of Chemistry, Chinese Academy of Sciences, Beijing
  • Received:1986-08-25 Revised:1987-01-05 Online:1987-11-20 Published:1987-11-20

摘要: 研究了α-CuPc/PVK体系的伏安特性及等温衰减电流(IDC)。观察到低场欧姆区与高场非欧姆区,其转折场强为1.2×104V/cm。在非欧姆区1g(I/V)与V1/2成线性关系,其系数为1.5×10-4eV/(V/cm)1/2,符合Poole-Frenkel效应。用简单的弛豫过程处理了不同场强和不同温度的IDC实验结果,得到的活化能随场强增加而减小,符合Poole-Frenkel效应。并用Garofano等人推导的电流密度与弛豫时间的关系式,计算了被陷载流子密度和与温度无关的逸出频率。

关键词: 酞菁铜, 伏安特性, 等温衰减电流, Poole-Frenkel效应

Abstract: The I-V characteristics and isothermal decay currents (IDC) of α-CuPc/PVK. have been studied. Ohm's law was observed below the field of 1.2×104 V/cm. At higher voltage,both of dark/photo conductions became non-Ohmic,lg(I/V) were directly proportional to V1/2,the non-Ohmic conductivity observed could be represented by: σ = σ0exp [1.5×10-4×E1/2KT] ,and the coefficient 1.5×10-4 eV/(V/cm)1/2 met the value required by Poole-Frenkel effect. The data of IDC were analyzed after the simple relaxation treatment by plotting lg[I(1)] vs. t. The temperture dependence of relaxation time fitted Arrhenius equation from which activation energy Eα could be obatained. The field dependence of Eα appeared close to the Poole-Frenkel effect too. We tried to apply Garofano's expression to the relaxation time,and calculated the trapped carrier density and the attempt-to-escape frequency.

Key words: copper-phthalocyanine, voltage-current characteristic, isothermal decay-current, Poole-Frenkel effect