Journal
JOURNAL OF ELECTRONIC MATERIALS
Volume 38, Issue 8, Pages 1677-1683Publisher
SPRINGER
DOI: 10.1007/s11664-009-0809-0
Keywords
ZnO; Hall mobility; Hall factor; Monte Carlo simulation; dislocation scattering
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The low-field electron mobility in bulk ZnO has been the object of extensive experimental studies, mainly through measurement of the temperature-dependent Hall effect. In this work, we reassess the experimental results through direct simulations of Hall measurements, performed with a Monte Carlo transport model and taking into account all the major scattering mechanisms. The deformation potentials required to compute acoustic and optical phonon scattering are derived from first-principles computations, and an original theory for charged-dislocation-line scattering is proposed and implemented. Monte Carlo results for the electron mobility and the Hall factor are compared with analytical expressions derived with the relaxation-time approximation, which is found to be adequate at low temperatures where inelastic scattering effects due to optical phonons are negligible.
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