Abstract
The need for large, room-temperature gamma-ray spectrometers to be fabricated from a single crystalline section of a cadmium zinc telluride (CZT) boule was recently met by progress in crystal growth of high-resistivity material. The characterization of such large crystals provides us with an opportunity to better understand the detector physics and apply characterization techniques, which were difficult to implement and analyze on smaller crystals. In this study, metal-semiconductor-metal, planar-CZT detectors were fabricated from large (approximately 9 × 9 × 6 mm3), CZT single crystals. We have investigated the relationship between the results of the electric-field mapping via Pockels effect, photoconductivity data, and detector performance. Changes in the surface recombination and device characteristics showing departure from symmetry are caused and revealed by variations in the surface preparation.
Original language | English |
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Pages (from-to) | 756-760 |
Number of pages | 5 |
Journal | Journal of Electronic Materials |
Volume | 32 |
Issue number | 7 |
DOIs | |
State | Published - Jul 2003 |
Externally published | Yes |
Funding
We gratefully acknowledge financial support from NASA through the Fisk Center for Photonic Materials and Devices and from Grant Nos. NCC8-133, NCC8-145, and NCC5-286. We also acknowledge support from the NSF-REU program under Grant No. DUE-9987224 and the DOE under Contract No. DE-FG08-98NV13407 through the Office of Nuclear Nonproliferation (NA-22) and DOD/BMDO Grant No. DAAD19-02-1-0003.
Funders | Funder number |
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BMDO | DAAD19-02-1-0003 |
Fisk Center for Photonic Materials and Devices | NCC8-133, NCC8-145, NCC5-286 |
NSF-REU | DUE-9987224 |
U.S. Department of Defense | |
U.S. Department of Energy | DE-FG08-98NV13407 |
National Aeronautics and Space Administration | |
Office of Defense Nuclear Nonproliferation | NA-22 |
Keywords
- CdZnTe room-temperature detector
- Internal electric-field distribution
- Photoconductivity
- Pockels effect