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

作者：Dongol M; El Nahass M M; El Denglawey A^*; Abuelwafa A A; Soga T

来源：Chinese Physics B, 2016, 25(6): 067201.

DOI：10.1088/1674-1056/25/6/067201

• PtOEP thin films
• AC conductivity
• dielectric constants
• organic semiconductors
• solar cell
• nano materials

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 W-m, hopping distance R-omega, and the density of localized states N (E-F) are valued at different frequencies. Dielectric constant epsilon(1) (omega, T) and dielectric loss epsilon(2) (omega, 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.

• 出版日期2016-6