PIN Diodes Array Made of Perovskite Single Crystal for X‐Ray Imaging

Abstract

Recently, lead (Pb) halide hybrid perovskites have emerged as sensitive X‐ray detectors due to their desirable charge transport properties and high absorption of ionizing photons. This work reports on a facile methodology for fabrication of highly efficient X‐ray PIN diodes based on MAPbBr 3 (MA, methylammonium; Pb, lead; Br, bromide) single crystals to detect X‐ray energies ranging from 30 to 100 keV. The 2 mm thickness PIN diode exhibits a low dark current density of 20 nA cm −2 at 150 V cm −1 and high X‐ray sensitivity of 23.6 μC mGy air −1 cm −2 . Besides, a large‐area array based on 30 mm × 28 mm × 7 mm MAPbBr 3 single crystal is fabricated for X‐ray imaging. When augmented with signal processing, selective higher and lower energy X‐ray signals can be separated simultaneously to satisfy different requirements for soft and hard organs and tissues in one exposure. This approach offers a new pathway for a one‐time radiation dose applied to the human body to achieve X‐ray images for tissues and blood vessels concurrently.