Electron and hole impact ionization coefficients in (100) and in (111) Si

Abstract
The impact ionization coefficients for electrons and holes in both (100)- and (111)-oriented Si have been determined from photocurrent measurements performed on reach-through avalanche photodiodes. The results for both orientations are similar, indicating that the ionization coefficients are isotropic. Monte Carlo calculations of the impact ionization coefficients compare favorably with the experimental results.