CHARGE-CARRIER MOBILITIES IN CD0.8ZN0.2TE SINGLE-CRYSTALS USED AS NUCLEAR RADIATION DETECTORS

Charge-carrier mobilities have been measured for the first time in Cd0.8Zn0.2Te single crystals using time-of-flight measurements of charge carriers produced by short ( 10 ns) light pulses from a frequency-doubled Nd:YAG laser (lambda=532 nm). The electron mobility displayed a T-1.1 dependence on the absolute temperature T in the range 200-320 K, with a room-temperature mobility of 1350 cm2/Vs. The hole mobility displayed a T-2.0 dependence in the same temperature range, with a room-temperature mobility of 120 cm2/V s. Cd0.8Zn0.2Te appears to be a very favorable material for a room-temperature electronic nuclear radiation detector.