Poole-Frenkel effect in amorphous poly(p-phenylene sulfide)

• Main Author: Campos, M.
• Publication Date: 1996
• Other Authors: Cavalcante, E. M. [UNESP], Kalinowski, J.
• Format: Article
• Language: eng
• Source: Repositório Institucional da UNESP
• Download full: http://dx.doi.org/10.1002/(SICI)1099-0488(199603)34:4<623; http://hdl.handle.net/11449/219191
• topic: Electrical conductivity of poly(p-phenylene sulfide); Poly(p-phenylene sulfide); Poole-Frenkel effect

The conductivity of poly(p-phenylene sulfide) (PPS) amorphous samples sandwiched between metallic electrodes has been studied as a function of applied voltage, temperature, and electrode material. The voltage (U) dependence of the currents for electric fields within the range 103-106 V/cm exhibits exp βU1/2 behavior with β = βSchottky below the glass transition temperature (Tg ≅ 90°C), and β = βPoole-Frenkel above Tg. Coordinated temperature measurements of dc currents with different metallic contacts and thermally stimulated currents (TSC) indicate, however, that the conductivity at T < Tg is consistent with the so-called anomalous Poole-Frenkel effect rather than the Schottky effect. Consequently, the p-type conductivity in amorphous PPS is proposed to be a bulk-limited process due to ionization of two different types of acceptor centers in the presence of neutral hole traps. © 1996 John Wiley & Sons, Inc.