Determination of X-ray detection limit and applications in perovskite X-ray detectors
| Autor: | Wanyi Nie, Neil R. Taylor, L. S. Pan, Lei Cao, Shreetu Shrestha |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
Photocurrent Detection limit Multidisciplinary business.industry Science Detector X-ray detector Imaging and sensing General Physics and Astronomy General Chemistry Article Sensors and biosensors General Biochemistry Genetics and Molecular Biology Photonic crystals Optics Optical sensors X-rays Figure of merit Sensitivity (control systems) Limit (mathematics) business Dark current |
| Zdroj: | Nature Communications, Vol 12, Iss 1, Pp 1-9 (2021) Nature Communications |
| ISSN: | 2041-1723 |
| Popis: | 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. The limit of X-ray detection is an important figure of merit for X-ray detectors, yet the suitability of method adopted from Currie’s 1968 paper and the following international standard is in doubt. Here, the authors propose a statistical model that correlates dark current and photo-current, show how it can be used to determine detection limit. |
| Databáze: | OpenAIRE |
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