Optimization of selenium in CdZnTeSe quaternary compound for radiation detector applications
- Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
X- and gamma-ray detectors are increasingly becoming essential tool for science and technology in various fields include homeland security, nonproliferation, nuclear security, medical imaging, astrophysics, and high energy physics. Cd1-xZnxTe1-ySey(CZTS) is emerging as a next-generation compound semiconductor for such applications. CZTS was found to possesses a very low concentration of Te inclusions and free from sub-grain boundary networks. Being a quaternary compound with varying alloy composition, optimization of the composition was performed to determine the minimum amount of selenium required to produce CZTS with reduced defects. The optimized composition was found to be x=0.10 and y=0.02, i.e., Cd0.9Zn0.1Te0.98Se0.02, for excellent material properties as a radiation detector. The resulting material was free from sub-grain boundary networks and with a highly reduced concentration of Te inclusions. The bulk dark resistivity obtained was in the range of 1-3x1010 ohm-cm with the highest achieved mobility-lifetime product of ~6.6x10-3 cm2/V for the optimized CZTS composition. Impurity analyses were performed by the Glow Discharge Mass Spectroscopy (GDMS) technique, and the results showed relatively high impurity concentrations compared to commercial detector-grade CdZnTe. Thus, CZTS has room for further improvement with additional purification of the starting materials.
- Research Organization:
- Savannah River Site (SRS), Aiken, SC (United States); Savannah River National Laboratory (SRNL), Aiken, SC (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation
- Grant/Contract Number:
- AC09-08SR22470; SC0012704
- OSTI ID:
- 1805217
- Alternate ID(s):
- OSTI ID: 1776391; OSTI ID: 1805250
- Report Number(s):
- SRNL-STI-2021-00109; BNL-221670-2021-JAAM; TRN: US2212723
- Journal Information:
- Applied Physics Letters, Vol. 118, Issue 15; ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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