| Abstract: | The longitudinal diffusion coefficient of electrons in CdTe has been measured with the time-of-flight technique at 300 K for field strength ranging from Ohmic values up to 60 kV/cm. The diffusion coefficient increases with increasing fields up to a maximum of 100 cm2/sec at E ≈ 15 kV/cm, that is at the threshold field for negative differential mobility, and then decreases. This behaviour, typical of Gunn effect materials, is in agreement with theoretical calculations and it is due to a first increase of electron mean energy followed by a dominant decrease of mobility. |
