中国物理B ›› 2016, Vol. 25 ›› Issue (6): 67201-067201.doi: 10.1088/1674-1056/25/6/067201

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Alternating current characterization of nano-Pt(II) octaethylporphyrin (PtOEP) thin film as a new organic semiconductor

M Dongol, M M El-Nahass, A El-Denglawey, A A Abuelwafa, T Soga   

  1. 1 Nano and Thin Film Laboratory, Physics Department, Faculty of Science, South Valley University, Qena 83523, Egypt;
    2 Physics Department, Faculty of Education, Ain Shams University, Roxy, Cairo 11757, Egypt;
    3 Physics Department, Faculty of Applied Medical Science, Taif University, Turabah 21995, Kingdom of Saudi Arabia;
    4 Department of Frontier Materials, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
  • 收稿日期:2015-10-31 修回日期:2016-01-24 出版日期:2016-06-05 发布日期:2016-06-05
  • 通讯作者: A El-Denglawey E-mail:denglawey@lycos.com

Alternating current characterization of nano-Pt(II) octaethylporphyrin (PtOEP) thin film as a new organic semiconductor

M Dongol1, M M El-Nahass2, A El-Denglawey1,3, A A Abuelwafa1,4, T Soga4   

  1. 1 Nano and Thin Film Laboratory, Physics Department, Faculty of Science, South Valley University, Qena 83523, Egypt;
    2 Physics Department, Faculty of Education, Ain Shams University, Roxy, Cairo 11757, Egypt;
    3 Physics Department, Faculty of Applied Medical Science, Taif University, Turabah 21995, Kingdom of Saudi Arabia;
    4 Department of Frontier Materials, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
  • Received:2015-10-31 Revised:2016-01-24 Online:2016-06-05 Published:2016-06-05
  • Contact: A El-Denglawey E-mail:denglawey@lycos.com

摘要:

Alternating current (AC) conductivity and dielectric properties of thermally evaporated Au/PtOEP/Au thin films are investigated each as a function of temperature (303 K-473 K) and frequency (50 Hz-5 MHz). The frequency dependence of AC conductivity follows the Jonscher universal dynamic law. The AC-activation energies are determined at different frequencies. It is found that the correlated barrier hopping (CBH) model is the dominant conduction mechanism. The variation of the frequency exponent s with temperature is analyzed in terms of the CBH model. Coulombic barrier height Wm, hopping distance Rω, and the density of localized states N(EF) are valued at different frequencies. Dielectric constant ε1(ω,T) and dielectric loss ε2(ω,T) are discussed in terms of the dielectric polarization process. The dielectric modulus shows the non-Debye relaxation in the material. The extracted relaxation time by using the imaginary part of modulus (M") is found to follow the Arrhenius law.

关键词: PtOEP thin films, AC conductivity, dielectric constants, organic semiconductors, solar cell, nano materials

Abstract:

Alternating current (AC) conductivity and dielectric properties of thermally evaporated Au/PtOEP/Au thin films are investigated each as a function of temperature (303 K-473 K) and frequency (50 Hz-5 MHz). The frequency dependence of AC conductivity follows the Jonscher universal dynamic law. The AC-activation energies are determined at different frequencies. It is found that the correlated barrier hopping (CBH) model is the dominant conduction mechanism. The variation of the frequency exponent s with temperature is analyzed in terms of the CBH model. Coulombic barrier height Wm, hopping distance Rω, and the density of localized states N(EF) are valued at different frequencies. Dielectric constant ε1(ω,T) and dielectric loss ε2(ω,T) are discussed in terms of the dielectric polarization process. The dielectric modulus shows the non-Debye relaxation in the material. The extracted relaxation time by using the imaginary part of modulus (M") is found to follow the Arrhenius law.

Key words: PtOEP thin films, AC conductivity, dielectric constants, organic semiconductors, solar cell, nano materials

中图分类号:  (Electronic conduction in metals and alloys)

  • 72.15.-v
72.20.-i (Conductivity phenomena in semiconductors and insulators)