High-resolution virtual Frisch grid gamma-ray detectors based on as-grown CdZnTeSe with reduced defects

Roy, Utpal N.; Camarda, Giuseppe S.; Cui, Yonggang; James, Ralph B.

doi:10.1063/1.5109119

High-resolution virtual Frisch grid gamma-ray detectors based on as-grown CdZnTeSe with reduced defects

Journal Article · Fri Jun 14 00:00:00 EDT 2019 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.5109119· OSTI ID:1547366

^[1]; Camarda, Giuseppe S. ^[2]; Cui, Yonggang ^[2]; James, Ralph B. ^[3]

Brookhaven National Lab. (BNL), Upton, NY (United States); Brookhaven National Laboratory
Brookhaven National Lab. (BNL), Upton, NY (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States); Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL)

X- and gamma-ray detectors arequickly becoming essential tools for science and technology in various fields. These detectors offer broad applications such as homeland security, nonproliferation, nuclear security, medical imaging, astrophysics, and high energy physics. All these applications necessitate high-resolution detectors operable at room temperature and available at a reasonable cost. CdZnTe (CZT) is the material of choice for this purpose; however, the material still suffers from intrinsic defects such as highly decorated subgrain boundary networks and a high concentration of secondary phases. These defects not only hinder the charge transport but also create a spatial inhomogeneity in the charge transport properties, subsequently causing substantial degradation in detector response particularly for relatively thick (>1 cm) detectors. Some of the material deficiencies suffered by CZT have been addressed by adding selenium into the CZT matrix. Selenium was found to be very effective in producing material that is principally free from a subgrain boundary network with the occasional appearance of subgrain boundaries with reduced secondary phases decorating these boundaries. The resulting quaternary compound CdZnTeSe (CZTS) reflected excellent material quality mitigating some major deficiencies suffered by CZT. Virtual Frisch grid detectors were fabricated from the as-grown CZTS ingots, and they demonstrated high resolution spectroscopic grade. The excellent CZTS material contained very low defects and was found to potentially increase the yield of high-quality detectors as compared to CZT.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation (NA-20)

Grant/Contract Number:: SC0012704

OSTI ID:: 1547366

Alternate ID(s):: OSTI ID: 1561206

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 23 Vol. 114; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Characterization of large-volume Frisch grid detector fabricated from as-grown CdZnTeSe Roy, Utpal N.; Camarda, Giuseppe S.; Cui, Yonggang Applied Physics Letters, Vol. 115, Issue 24 https://doi.org/10.1063/1.5133389	journal	December 2019