IMPROVED CdTe FOR GAMMA DETECTION BETWEEN −100°C AND + 100°C

Abstract

Mobility‐trapping time μτ⁺ products of 2 × 10⁻⁴ cm²/V for electrons and 3 × 10⁻⁵ cm²/V for holes have been found in semi‐insulating cadmium telluride using transient response techniques. This represents a tenfold and fourfold increase in the μτ⁺ product of holes and electrons, respectively. The ⁶⁰Co response of surface barrier devices fabricated from this material indicates that gamma detection is possible over the extended temperature range of −100° to +100°C. Encapsulation techniques have been developed to prevent the degradation of these devices from the ambient atmosphere.