Monte Carlo Solution of High Electric Field Hole Transport Processes in Avalanche Amorphous Selenium

摘要: Amorphous selenium lacks the structural long-range order present in crystalline solids. However, stark similarity short-range that exists across its allotropic forms, augmented with a shift to non-activated extended-state transport at high electric fields beyond onset of impact ionization, allowed us perform this theoretical study, which describes high-field hole processes amorphous by modeling band-transport lattice theory counterpart trigonal selenium. An in-house bulk Monte Carlo algorithm is employed solve semiclassical Boltzmann equation, providing microscopic insight carrier trajectories and relaxation dynamics these non-equilibrium "hot" holes extended states. The hole-phonon interaction lack phase modeled as individual scattering processes, namely acoustic, polar non-polar optical phonons, disorder dipole scattering, ionization gain, using power law Keldysh fit. We have used non-parabolic approximation density functional calculated valence band To validate our model, we calculate compare time flight mobility, ensemble energy velocity, field distributions experimental findings. reached conclusion hot drift around direction perpendicular applied are subject frequent acceleration/deceleration caused presence phonon, disorder, impurity scattering. This leads certain determinism otherwise stochastic phenomenon, usually seen elemental