Electron mobility in n-doped zinc sulphide

TL;DR

This paper investigates how electron mobility in n-doped zinc sulphide varies under strong electric fields, analyzing different scattering mechanisms and their contributions to mobility in wurtzite and zincblende structures.

Contribution

It provides a detailed analysis of the nonequilibrium thermodynamic state and the electric field dependence of electron mobility in n-doped ZnS, highlighting the dominant scattering channels.

Findings

Mobility decreases with increasing electric field strength.

Polar-optic interactions are the main scattering mechanism.

Deformation acoustic and impurity interactions have lesser effects.

Abstract

A study of the mobility of n-doped wurtzite and zincblende ZnS is reported. We have determined nonequilibrium thermodynamic state of the ZnS, driven far away from equilibrium by a strong electric field, in the steady state. The dependence of the mobility (which depends on the nonequilibrium thermodynamic state of the sample) on the electric field strength is derived, which decreases with the strength of electric field. We analyzed the contributions to the mobility arising out of the different channels of electron scattering, namely, the polar optic, deformation, interactions with the phonons, and with ionized impurities. The case of n-ZnS WZ and ZB have been analyzed: as expected the main contribution comes from the polar-optic interactions in this strong-polar semiconductor. The other interactions are in decreasing order, the deformation acoustic and the one due to impurities.