Ionic and electronic conduction in TlBr and CsPbBr3 semiconductor gamma-ray detectors

James F. Christian; Oleg Maksimov; Hadong Kim; Mike S. Squillante; Matthius Müller; Harry L. Tuller; Thomas Defferriere; Han Gil Seo; Tamar Kadosh Zhitomirsky; Josh Palmer; Govinda Adhikari; Indra Pandey; Grant Alexander

doi:10.1117/12.3027266

4 October 2024 Ionic and electronic conduction in TlBr and CsPbBr₃ semiconductor gamma-ray detectors

James F. Christian, Oleg Maksimov, Hadong Kim, Mike S. Squillante, Matthius Müller, Harry L. Tuller, Thomas Defferriere, Han Gil Seo, Tamar Kadosh Zhitomirsky, Josh Palmer, Govinda Adhikari, Indra Pandey, Grant Alexander

Author Affiliations +

Proceedings Volume 13151, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXVI; 131510L (2024) https://doi.org/10.1117/12.3027266
Event: Optical Engineering + Applications, 2024, San Diego, California, United States

Conference Poster

Abstract

Room temperature semiconductor detectors provide high energy resolution in gamma-ray spectroscopic applications, such as radioisotope identification. Materials such as TlBr and CsPbBr3, which provide ~2% FWHM, or better, energy resolution for 662-keV photopeak from Cs-137 irradiation at room temperature and high stopping power, nevertheless exhibit mixed electronic and ionic conduction that can lead to undesirable performance degradation. While the charge pulses generated by the gamma-ray interaction and a component of the leakage current are composed of a dominant electronic signal, the ionic component contributes to the current. It affects device stability via the migration of ionic species under applied bias and polarization at the semiconductor-electrode interface, interfering with charge collection. In this work, we characterize electronic and ionic conduction in single-crystal devices of TlBr and CsPbBr3 (CLB) using ionically blocking electrodes. The ionic contribution to the leakage current is evaluated from the devices' impedance spectra. In contrast, the electronic contribution is extracted from the asymptotic limit of the devices' current-voltage-time (iVt) plots for different bias values. The response to illumination with a 375-nm LED is also measured in the iVt plots. This work presents expressions for the temperature dependence of the conductivity, referencing previous work for TlBr. It also presents the gamma-ray spectra's bias dependence and evaluates ionic conduction's role in device burn-in, conditioning, and aging processes. Comparing the impedance spectra with and without LED illumination confirms that ions represent the majority charge carrier at room temperature for TlBr and CLB, which is consistent with previous work.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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James F. Christian, Oleg Maksimov, Hadong Kim, Mike S. Squillante, Matthius Müller, Harry L. Tuller, Thomas Defferriere, Han Gil Seo, Tamar Kadosh Zhitomirsky, Josh Palmer, Govinda Adhikari, Indra Pandey, and Grant Alexander "Ionic and electronic conduction in TlBr and CsPbBr₃ semiconductor gamma-ray detectors", Proc. SPIE 13151, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXVI, 131510L (4 October 2024); https://doi.org/10.1117/12.3027266

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