Low temperature photoluminescence (PL) and high-resolution X-ray diffraction study of traveling heater method (THM) grown Cd0.9Zn0.1Te0.98Se0.02 crystals (Conference Presentation)

Utpal N. Roy; Jonathon N. Baker; Giuseppe S. Camarda; Yonggang Cui; Ge Yang; Ralph B. James

doi:10.1117/12.2635769

3 October 2022 Low temperature photoluminescence (PL) and high-resolution X-ray diffraction study of traveling heater method (THM) grown Cd_0.9Zn_0.1Te_0.98Se_0.02 crystals (Conference Presentation)

Utpal N. Roy, Jonathon N. Baker, Giuseppe S. Camarda, Yonggang Cui, Ge Yang, Ralph B. James

Author Affiliations +

Proceedings Volume PC12241, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXIV; PC122410A (2022) https://doi.org/10.1117/12.2635769
Event: SPIE Optical Engineering + Applications, 2022, San Diego, California, United States

Abstract

CdZnTe (CZT) has been the material of choice and a successful commercial material for X-ray and gamma-ray radiation detector applications. However, despite continued research for last three decades, CZT still contains a high density of performance-limiting defects and compositional inhomogeneity in as-grown ingots. Recently, one option has been explored to add a small amount of selenium (Se) in the CZT matrix to improve compositional homogeneity and mitigate many performance-limiting defects. As a result, the quaternary CdxZn1−xTeySe1−y (CZTS) is emerging as a next-generation compound semiconductor for room-temperature gamma-ray detector applications. Nevertheless, it is well known that adding selenium in CdTe/CZT matrix imposes severe alloy/lattice disorder in the ternary and quaternary compounds, and the bowing of the bandgap with an increased Se content is the result of lattice disorder. Hence, the effect of lattice disorder is expected to degrade the crystalline quality of the material. In this presentation, we report our effort on evaluating the crystalline quality of THM-grown CZTS crystals with the optimized composition (Cd0.9Zn0.1Te0.98Se0.02). The as-grown samples were characterized by the low-temperature photoluminescence (PL) experiments and high-resolution X-ray diffraction using a synchrotron light source at Brookhaven National Laboratory (BNL). The full width at half maximum (FWHM) of both the PL and the X-ray rocking curve were observed to be broadened due to the lattice disorder of the quaternary compound, eventually degrading the crystalline quality. This was confirmed through Density Functional Theory (DFT) calculations.

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Utpal N. Roy, Jonathon N. Baker, Giuseppe S. Camarda, Yonggang Cui, Ge Yang, and Ralph B. James "Low temperature photoluminescence (PL) and high-resolution X-ray diffraction study of traveling heater method (THM) grown Cd_0.9Zn_0.1Te_0.98Se_0.02 crystals (Conference Presentation)", Proc. SPIE PC12241, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXIV, PC122410A (3 October 2022); https://doi.org/10.1117/12.2635769

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KEYWORDS

Crystals

X-ray diffraction

Crystallography

Luminescence

Compound semiconductors

Excitons

Selenium

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