Monte Carlo Investigation of High-Field Electron Transport Characteristics in ZnMgO/ZnO Heterostructures.

The high-field electron transport properties of ZnMgO/ZnO heterostructures considering multisubband conduction were systematically investigated with an ensemble Monte Carlo program developed by us. Electronic band structures were obtained by first-principles calculations using density functional theory, which provides more accurate parameters to calculate the electronic states and transport characteristics of 2-D electron gas. Wave functions and energy levels describing the subband structure were achieved to determine the 2-D scattering rates by solving the Schrödinger and Poisson equations self-consistently. The highest electron mobility gained at room temperature was approximately 4.23\times 10^\mathrm 2 cm2/Vs. The negative differential mobility was observed with a threshold electric field of approximately 80 kV/cm. The peak drift velocity of the Zn0.694Mg0.306O/ZnO heterostructure at 200 KV was about 2.011\times 10^8 cm/s. This paper benefits the development of high-performance ZnMgO/ZnO heterostructure devices. [ABSTRACT FROM AUTHOR]