Performance of CdZnTe pixellated radiation detectors assembled by a new attachment method

Lu, P. H.; Chen, Henry; Awadalla, Salah; Iniewski, Krzysztof; Bindley, Glenn

doi:10.1117/12.860999

Cited by 1 publication

(1 citation statement)

References 15 publications

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“…Gold stud bonding with polymer epoxy, metal bump bonding techniques, and anisotropic conductive film (ACF) have been utilized for bonding of pixellated CZT crystals and readout board [16], [17]. Pixel configuration, size of the boding pad and their pitch, electrode metallization, operative voltage are important factors to consider for bonding.…”

Section: B Bonding Flexible Circuit To Dual-stack Czt Crystalsmentioning

confidence: 99%

Impact of Flexible Circuit Bonding and System Integration on Energy Resolution of Cross-Strip CZT Detectors

Enlow

Diba

Clayton

et al. 2023

IEEE Trans. Radiat. Plasma Med. Sci.

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Cadmium Zinc Telluride (CZT) detectors enables high spatial resolution and high detection efficiency and are utilized for many gamma-ray and X-ray spectroscopy applications. In this paper, we describe a stable bonding process and report on the characterization of cross-strip CZT detectors before and after bonding to flexible circuit. The bonding process utilizes gold stud bonding and polymer epoxy technique to bond the flexible circuits to two CZT crystals and form a detector module in an Anode-Cathode-Cathode-Anode (ACCA) configuration. The readout electronics is optimized in terms of shaper setting and steering electrode voltage. The average full width half maximum (FWHM) energy resolution at 662 KeV of 110 CZT crystals tested individually was 3.5% ± 0.59% and 4.75% ± 0.48% prebonded and post-bonded, respectively. No depth correction was performed in this study. The average FWHM energy resolution at 662 KeV of the scaled-up system with 80 CZT crystals was 4.40% ± 0.53%, indicating the scaled-up readout electronics and stacking of the modules does not deteriorate performance. The proper shielding and grounding of the scaled-up system slightly improved the system-wide performance. The FWHM energy resolution at 511 KeV of the scaled-up system was 5.85% ± 0.73%.

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Section: B Bonding Flexible Circuit To Dual-stack Czt Crystalsmentioning

confidence: 99%