PooleFrenkel Photoconductivity
in Amorphous Se₇₅Te₂₀Sb₅ Thin Films¹

N. Mehta^a,* and A. Kumar^b

^aDepartment of Physics, Banaras Hindu University, Varanasi, India

^bDepartment of Physics, Harcourt Butler Technological Institute, Kanpur, India

*e-mail: dr_neeraj_mehta@yahoo.co.in

Received October 6, 2009

Abstract—In many amorphous and liquid semiconductors and many other class of materials, pre-exponential
factor of electrical conductivity ₀ is found to increase exponentially with activation energy E according to
Meyer–Neldel rule. This rule is generally verified by selecting different compositions of different E 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 (_ph)₀ and activation energy of (E_ph) photoconductivity in amorphous thin films of
Se₇₅Te₂₀Sb₅ 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 E_ph by applying high electric fields.

Key words: chalcogenide glasses, Poole–Frenkel conduction, Meyer–Neldel rule, thin films, electrical proper-
ties

DOI: 10.1134/S1087659610030077

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