High spectral resolution of gamma-rays at room temperature by perovskite CsPbBr3 single crystals

Yihui He, Liviu Matei, Hee Joon Jung, Kyle M. McCall, Michelle Chen, Constantinos C. Stoumpos, Zhifu Liu, John A. Peters, Duck Young Chung, Bruce W. Wessels, Michael R. Wasielewski, Vinayak P. Dravid, Arnold Burger and Mercouri G. Kanatzidis ()
Additional contact information
Yihui He: Northwestern University
Liviu Matei: Fisk University
Hee Joon Jung: Northwestern University
Kyle M. McCall: Northwestern University
Michelle Chen: Northwestern University
Constantinos C. Stoumpos: Northwestern University
Zhifu Liu: Northwestern University
John A. Peters: Northwestern University
Duck Young Chung: Argonne National Laboratory
Bruce W. Wessels: Northwestern University
Michael R. Wasielewski: Northwestern University
Vinayak P. Dravid: Northwestern University
Arnold Burger: Fisk University
Mercouri G. Kanatzidis: Northwestern University

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract Gamma-ray detection and spectroscopy is the quantitative determination of their energy spectra, and is of critical value and critically important in diverse technological and scientific fields. Here we report an improved melt growth method for cesium lead bromide and a special detector design with asymmetrical metal electrode configuration that leads to a high performance at room temperature. As-grown centimeter-sized crystals possess extremely low impurity levels (below 10 p.p.m. for total 69 elements) and detectors achieve 3.9% energy resolution for 122 keV 57Co gamma-ray and 3.8% for 662 keV 137Cs gamma-ray. Cesium lead bromide is unique among all gamma-ray detection materials in that its hole transport properties are responsible for the high performance. The superior mobility-lifetime product for holes (1.34 × 10−3 cm2 V−1) derives mainly from the record long hole carrier lifetime (over 25 μs). The easily scalable crystal growth and high-energy resolution, highlight cesium lead bromide as an exceptional next generation material for room temperature radiation detection.

Date: 2018
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DOI: 10.1038/s41467-018-04073-3

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