Fig. 7.

Spread of UTD pulses due to Gaussian dispersion of holes as a function of drift distance for three interactions of different depths within a-Se bulk: $8\mu \mathrm{m}$ (red), $100\mu \mathrm{m}$ (blue), and $200\mu \mathrm{m}$ (green) above well-sensing region. Each pulse is centered about the drift time needed by the charge cloud to travel from absorption depth to sensing electrode.