Polycrystalline Formamidinium Lead Bromide X-ray Detectors

Applied Sciences

Justin Reiss¹  Douglas Wolfe¹  Carol Crean²  Robert Moss³  Paul Sellin⁴  Joydip Ghosh⁴  Stephanie Bennett⁴  Harry Gibbard⁴  Suad Alghamdi⁴ 

[1] Applied Research Laboratory, Materials Science and Engineering Department, The Pennsylvania State University, University Park, PA 16802, USA;Department of Chemistry, University of Surrey, Guildford GU2 7XH, UK;Department of Medical Physics and Biomedical Engineering, University College London, London WC1E 6BT, UK;Department of Physics, University of Surrey, Guildford GU2 7XH, UK;

关键词: formamidinium lead bromide;    perovskite;    X-ray detector;   

DOI  :  10.3390/app12042013

来源: DOAJ

【 摘 要 】

We have investigated the performance of formamidinium lead bromide (FAPbBr${}_3$) perovskite X-ray detectors fabricated from polycrystalline material that is pressed into a pellet at high pressures. FAPbBr${}_3$ has been shown to exhibit a remarkable combination of electrical and physical properties, such that mechanically-formed polycrystalline pellets exhibit good charge transport properties suitable for use as X-ray detectors. We characterise the morphology and structure of FAPbBr${}_3$ pellets using photoluminescence (PL), electron microscopy (SEM) and X-ray diffraction (XRD), and demonstrate an improvement in the microstructure, density, and charge transport performance of the material as the pressure is increased from 12 MPa to 124 MPa. The use of annealing of the pellets after pressing also improves the stability and charge transport performance of the devices. Using a 40 kV X-ray beam, a maximum X-ray sensitivity of 169 µC Gy${}^{-1}$ cm${}^{-2}$ was measured, and the fast time response of the devices was demonstrated using a chopped X-ray beam.

【 授权许可】

Unknown