Internal Electric Field Behavior of Cadmium Zinc Telluride Radiation Detectors Under High Carrier Injection
Source: Journal of Electronic Materials, Volume 40, Number 8, August 2011 , pp. 1689-1692(4)
Abstract:The behavior of the internal electric field of nuclear-radiation detectors substantially affects detector performance. We investigated the distribution of the internal field in cadmium zinc telluride (CZT) detectors under high carrier injection. We noted the build-up of a space-charge region near the cathode that produces a built-in field opposing the applied field. Its presence entails the collapse of the electric field in the rest of the detector, other than the portion near the cathode. Such a space-charge region originates from serious hole trapping in CZT. The device’s operating temperature greatly affects the width of the space-charge region. With increasing temperature from 5°C to 35°C, its width expanded from about one-sixth to one-half of the total depth of the detector.
Document Type: Research Article
Publication date: August 1, 2011