IMPACT IONIZATION RATE AND HIGH-FIELD TRANSPORT IN ZNS WITH NONLOCAL BAND-STRUCTURE

The impact ionization rate in ZnS is calculated using a nonlocal empir ical pseudopotential band structure and compared to previous results u sing a local calculation. The two resulting rates are then compared an d simple fit formulas are presented. These are included in an ensemble Monte Carlo simulation of electron transport in bulk ZnS. The calcula ted impact ionization rate is then compared to experimental impact ion ization coefficient data; reasonable agreement between the experimenta l data and the calculated impact ionization rate is obtained with an a ppropriate choice of optical deformation potentials. (C) 1996 American Institute of Physics.