Determination of X-ray detection limit and applications in perovskite X-ray detectors

Lei Pan, Shreetu Shrestha, Neil Taylor, Wanyi Nie and Lei R. Cao ()
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Lei Pan: The Ohio State University
Shreetu Shrestha: Los Alamos National Laboratory
Neil Taylor: The Ohio State University
Wanyi Nie: Los Alamos National Laboratory
Lei R. Cao: The Ohio State University

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract X-ray detection limit and sensitivity are important figure of merits for perovskite X-ray detectors, but literatures lack a valid mathematic expression for determining the lower limit of detection for a perovskite X-ray detector. In this work, we present a thorough analysis and new method for X-ray detection limit determination based on a statistical model that correlates the dark current and the X-ray induced photocurrent with the detection limit. The detection limit can be calculated through the measurement of dark current and sensitivity with an easy-to-follow practice. Alternatively, the detection limit may also be obtained by the measurement of dark current and photocurrent when repeatedly lowering the X-ray dose rate. While the material quality is critical, we show that the device architecture and working mode also have a significant influence on the sensitivity and the detection limit. Our work establishes a fair comparison metrics for material and detector development.

Date: 2021
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DOI: 10.1038/s41467-021-25648-7

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