Role of Selenium Addition to CdZnTe Matrix for Room-Temperature Radiation Detector Applications

Roy, Utpal N.; Camarda, G. S.; Cui, Y.; Gul, R.; Hossain, A.; Yang, G.; Zazvorka, J.; Dedic, V.; Franc, J.; James, R. B.

doi:10.1038/s41598-018-38188-w

Title: Role of Selenium Addition to CdZnTe Matrix for Room-Temperature Radiation Detector Applications

Journal Article · Thu Feb 07 00:00:00 EST 2019 · Scientific Reports

DOI:https://doi.org/10.1038/s41598-018-38188-w· OSTI ID:1488840

Roy, Utpal N. ^[1]; Camarda, G. S. ^[1]; Cui, Y. ^[1]; Gul, R. ^[1]; Hossain, A. ^[1]; Yang, G. ^[1]; Zazvorka, J. ^[2]; Dedic, V. ^[2]; Franc, J. ^[2]; James, R. B. ^[1]

Brookhaven National Lab. (BNL), Upton, NY (United States)
Charles Univ., Prague (Czech Republic). Inst. of Physics

Because of its ideal band gap, high density and high electron mobility-lifetime product, cadmium zinc telluride (CdZnTe or CZT) is currently the best room-temperature compound-semiconductor X- and gamma-ray detector material. However, because of its innate poor thermo-physical properties and above unity segregation coefficient for Zn, the wide spread deployment of this material in large-volume CZT detectors is still limited by the high production cost. The underlying reason for the low yield of high-quality material is that CZT suffers from three major detrimental defects: compositional inhomogeneity, high concentrations of dislocation walls/sub-grain boundary networks and high concentrations of Te inclusions/precipitates. To mitigate all these disadvantages, we report for the first time the effects of the addition of selenium to the CZT matrix. The addition of Se was found to be very effective in arresting the formation of sub-grain boundaries and its networks, significantly reducing Zn segregation, improving compositional homogeneity and resulting in much lower concentrations of Te inclusions/precipitates. Growth of the new quaternary crystal Cd_1-xZn_xTe_1-ySe_y (CZTS) by the Traveling Heater Method (THM) is reported in this paper. We have demonstrated the production of much higher yield according to its compositional homogeneity, with substantially lower sub-grain boundaries and their network, and a lower concentration of Te inclusions/precipitates.

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: SC0012704

OSTI ID:: 1488840

Report Number(s):: BNL-209809-2018-JAAM

Journal Information:: Scientific Reports, Vol. 9, Issue 1; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 37 works

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High-resolution virtual Frisch grid gamma-ray detectors based on as-grown CdZnTeSe with reduced defects Roy, Utpal N.; Camarda, Giuseppe S.; Cui, Yonggang Applied Physics Letters, Vol. 114, Issue 23 https://doi.org/10.1063/1.5109119	journal	June 2019
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
Ammonium Fluoride Passivation of CdZnTeSe Sensors for Applications in Nuclear Detection and Medical Imaging Egarievwe, Stephen U.; Roy, Utpal N.; Goree, Carmella A. Sensors, Vol. 19, Issue 15 https://doi.org/10.3390/s19153271	journal	July 2019

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