The transient response of semi-insulating CdTe to monoenergetic alpha particles is composed of a fast component, characteristic of trapping, and slow component displaying the release of carriers from traps. It is verified that the shape of the fast component is directly proportional to [1 - exp (-t/τ+)] for electrons where τ+ is the mean free drift time. From an analysis of the shape, τ+ for electrons ranges from 30 to 90 nsec; mobilities from 600 to 1100 cm2/V-sec. On a single-level model thermal and optical excitation data indicate a trapping level at 0.6±0.05 eV from the conduction band.
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Zanio et al. (1967) studied this question.
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