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

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 100keV. The 2mm thickness PIN diode exhibits a low dark current density of 20nAcm(-2) at 150Vcm(-1) and high X-ray sensitivity of 23.6CmGy(air)(-1)cm(-2). Besides, a large-area array based on 30mmx28mmx7mm 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.