Electron-Transport Properties of a ZnMgO/ZnO Hetero Structure and the Effect of Interface Roughness and ZnMgO Thickness

Abstract

The electron-transport properties of a Zn 1Àx Mg x O/ZnO hetero structure were studied by use of an ensemble Monte Carlo technique. There was no intentional doping in the profile and the entire charge is because of polarization of charges at the interface. Interface roughness, and the intensity of acoustic and optic phonon scattering were used in the ensemble Monte Carlo method to find the transport properties of the two-dimensional electron gas (2DEG). The lowfield mobility characteristics of the structure were determined as a function of temperature, the thickness of the ZnMgO layer, and the interface roughness. The interface roughness was found to have a very large effect on the drift mobility of carriers, especially at low temperatures. It was observed that as the thickness of the ZnMgO increases the concentration of electrons increases whereas the mobility of the electrons decreases. The low-field mobility values obtained from ensemble Monte Carlo simulations were in agreement with published experimental data.

Determination of hot-electron drift velocity in (Be)ZnMgO/ZnO 2DEG channels

“…Electron scattering analysis in 2DEG of sputtering grown MgZnO/ZnO heterostructure was performed with an analytical model [14]. The effect of interface roughness and ZnMgO thickness on low-field electron mobility in ZnO 2DEG channel was studied by the Monte Carlo method [15]. This method was also applied to study high-field electron transport characteristics in ZnMgO/ZnO heterostructures [16].…”