Crystal growth, characterization, and fabrication of Cd0.9Zn0.1Te monolithic pixelated detectors for high-energy gamma-ray

Mohsin Sajjad; Joshua W. Kleppinger; Krishna C. Mandal

doi:10.1117/12.2530181

10 September 2019 Crystal growth, characterization, and fabrication of large-area Cd_0.9Zn_0.1Te pixelated detectors for high-energy gamma-ray detectors

Mohsin Sajjad, Joshua W. Kleppinger, Krishna C. Mandal

Author Affiliations +

Proceedings Volume 11114, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXI; 111141T (2019) https://doi.org/10.1117/12.2530181
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

Abstract

Cd_0.9Zn_0.1Te (CZT) based pixelated radiation detectors have been fabricated and characterized for high-energy gamma ray detection. Large-volume ingots with large single crystalline grains have been grown and several 10 × 10 pixilated detectors have been fabricated from the grown crystals for imaging studies. Guard ring grids have been designed and fabricated to reduce cross-talk and inter-pixel/inter-electrode leakage. The grown crystals were initially characterized in planar configurations through electrical and optical methods prior to the fabrication of pixilated structure. Current-voltage (I-V) measurements revealed very low leakage current in the range of nA at an operating bias voltage of 1000 V and a resistivity of ~ 6×10¹⁰ Ω-cm was obtained. Infrared transmission imaging revealed average tellurium inclusion size of <8 micron. Measurements through Pockels’ effect has revealed a near-uniform depth-wise distribution of the internal electric field. Gamma-ray spectroscopy using ¹³⁷Cs (662 keV) radiation source on the monolithic pixelated structure showed excellent detection performance for all the 100 pixels, with a resolution ~1.5 % FWHM.

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Mohsin Sajjad, Joshua W. Kleppinger, and Krishna C. Mandal "Crystal growth, characterization, and fabrication of large-area Cd_0.9Zn_0.1Te pixelated detectors for high-energy gamma-ray detectors", Proc. SPIE 11114, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXI, 111141T (10 September 2019); https://doi.org/10.1117/12.2530181

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KEYWORDS

Sensors

Crystals

Gamma radiation

Spectroscopy

Image resolution

Infrared imaging

Infrared radiation

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