Solution-processed cascade perovskite single crystals for radiation detection
Xin Wang a, Yuwei Li a, Yubing Xu a, Yuzhu Pan a, Jing Chen a, Qing Li a, Wei Lei a
a Joint International Research Laboratory of Information Display and Visualization, School of Electronic Science and Engineering, Southeast University, Nanjing, 210096, China
nanoGe Fall Meeting
Proceedings of nanoGe Fall Meeting19 (NGFM19)
#RadDet19. Radiation Detection Semiconductors Materials, Physics and Devices
Berlin, Germany, 2019 November 3rd - 8th
Organizers: Mahshid Ahmadi and Germà Garcia-Belmonte
Poster, Xin Wang, 353
Publication date: 16th July 2019

X-ray photons emitted from X-ray tube used in medical imaging, industrial inspection and security check are usually contained radiation with different photon energy. Due to the penetrate ability is related to the density of object and the photon energy of X-ray, low Z (atomic number) materials such as muscle and plastics would absorb more X-rays with low photon energy(<40 keV); High Z materials such bones and iron would stop more X-rays with high photon energy (60~160 keV). As a result, the information consisted of X-ray with low photon energy could provide a better contrast of low Z materials and the information made of X-ray with high photon energy can offer more details of high Z materials. What’s more, using subtraction method, the image made of low Z materials could be subtracted from high X-ray photon energy and low X-ray photon energy which has been widely used in Lung digital radiography.

In this work, a photodiode is grown with the structure of n-type MAPbCl3(2 mm)/ P-type buffer MAPbBr3(0.2 mm)/ n-type MAPbI3(3 mm)[2]. The X-ray would incident from the MAPbCl3 face, Then X-ray with low photon energy would be fully absorbed in this layer and generate charges and high photon energy X-ray photons could arrive the MAPbI3 layer. Using different voltage bias, the charges generate in different layer could be collected separately and realize energy-selective X-ray detection.

This work is financially supported by the National Key R&D Program of China (2017YFC0111500 and 2016YFB0401600), National Natural Science Foundation Project (61775034, 61571124, 61674029), and NSFC Research Fund for International Young Scientists (61750110537). The experimental part of the work was carried out at Southeast University. 

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