Poole-Frenkel Photoconductivity in Amorphous Se_(75)Te_(20)Sb5 Thin Films

摘要

In many amorphous and liquid semiconductors and many other class of materials, pre-exponen-tial factor of electrical conductivity σ_0 is found to increase exponentially with activation energy AE according to Meyer-Neldel rule. This rule is generally verified by selecting different compositions of different AE in a given class of materials. In the present paper, we report the investigation of Meyer-Neldel rule (MN rule) for the pre-exponential factor (σ_(ph))_0 and activation energy of (ΔE_(ph)) photoconductivity in amorphous thin films of Se_(75)Te_(20)Sb5 for high field conduction. The photoconduction was found to be ohmic at low fields and of Poole-Frenkel type at high fields. In the present work we have changed ΔE_(ph) by applying high electric fields.