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Velocity-field characteristics of MgxZn1−xO/ZnO heterostructures

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Abstract

In this work, electron transport in MgxZn1−xO/ZnO heterostructures at room temperature is simulated by the ensemble Monte Carlo (EMC) method. Electron scattering mechanisms including acoustic deformation potential, piezoelectric acoustic phonon, polar optical phonon (POP), interface roughness (IFR), dislocation, electron escape (ESC) and capture (CPR) by optical phonons, and random alloy are considered in EMC. The electron drift velocity in MgxZn1−xO/ZnO heterostructures is calculated for various Mg mole fractions x (0.1–0.3) at electric fields up to 25 kV/cm. We find that no obvious velocity saturation occurs in the range of the electric field considered. The results show that ESC scattering is one of the main physical mechanisms limiting the drift velocity. On the other hand, the competition between IFR and intersubband POP scattering is found to play an important role in the change in electron drift velocity with the increasing Mg mole fractions.

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The datasets generated during and/or analysed during the current study are not publicly available, but are available from the corresponding author on reasonable request.

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Funding

This work is supported by Science and Technology Program of Guangzhou, China (Grant No. 201804010444). The authors have no relevant financial or non-financial interests to disclose.

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  1. School of Information Engineering, Guangdong University of Technology, Guangzhou, 510006, People’s Republic of China

    DongFeng Liu

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Liu, D. Velocity-field characteristics of MgxZn1−xO/ZnO heterostructures. J Comput Electron 22, 603–611 (2023). https://doi.org/10.1007/s10825-022-01999-2

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