Abstract
The drift-velocity characteristic for electrons in CdTe has been measured by the transientcharge technique from 77 to 370 \ifmmode^\circ\else\textdegree\fi{}K and for electric fields up to 70 kV/cm. Over this temperature range a negative differential mobility was found. The measured peak drift velocity increases from 1.25 \ifmmode\times\else\texttimes\fi{} ${10}^{7}$ cm/sec at 370 \ifmmode^\circ\else\textdegree\fi{}C to 2.5 \ifmmode\times\else\texttimes\fi{} ${10}^{7}$ cm/sec at 77 \ifmmode^\circ\else\textdegree\fi{}K and is characteristic of intrinsic material. The threshold field decreases from 16kV/cm at 370 \ifmmode^\circ\else\textdegree\fi{}C to 11 kV/cm at 77 \ifmmode^\circ\else\textdegree\fi{}K. At lower temperatures (220 \ifmmode^\circ\else\textdegree\fi{}K) and at low electric fields ( ${10}^{4}$ kV/cm) the drift velocity varies from sample to sample increasing with increasing trapping time, and is presumably associated with scattering by ionized centers. An increase of the electron trapping time from 4 nsec at an electric field at 2 kV/cm to 45 nsec at an electric field of 30 kV/cm has also been measured at room temperature.
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