Electron drift velocity in n-GaAs at high electric fields

Measurements have been made on the drift velocity of electrons in n-GaAs by the time-of-flight technique. The method of determining the νE characteristics from the transit time across the non-uniform field depletion region of the sample is described. Velocity/field curves are presented in the field range 20 to 113 kV/cm at various temperatures from 130 to 400°K. All curves show the velocity to decrease slowly as the field is increased and velocity saturation is approached at the highest field values used. The characteristics match up well with the generally accepted experimental curves at the lower fields, and a simple theory is described which predicts well the saturation velocity.

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