Charge collection from ion tracks in simple EPI diodes

Charge collection from ion tracks in epi diodes is investigated. As previously noted by others, the collected charge can exceed the charge liberated in the epi layer. Fundamental concepts are discussed and illustrated by computer simulation results. It is found that the n/sup +/-p-p/sup +/ diode displays a funneling regime and a diffusion regime (as previously noted by others), but the p/sup +/-n-n/sup +/ diode does not display separate regimes. Simple quantitative models are provided which agree fairly well with computer simulation results. Experimental data were compared to one of the models, and good agreement was found.