Work

Flexible indirect x-ray detector enabled by organic photodiode and CsPbBr 3 perovskite quantum dot scintillator

Year: 2021

Type: article

Abstract: X-ray photodetection are frequently used in medical diagnoses industrial inspection and environmental radiation detection. Currently, there is an ongoing effort to develop bendable or flexible x-ray photodetectors (PDs) to meet the demand on light weight and arbitrary shape detection system. Here, a highly bendable indirect x-ray PD is designed by coupling a P3HT:PC 61 BM organic photodetectors (OPDs) with a flexible perovskite quantum dots (QDs) embedded polymer scintillator. The flexible perovskite QDs scintillator exhibits high radioluminescence with emission peak centers at the 537 nm, which falls in maximum absorption range of poly(3-hexylthiophene) (P3HT). The OPD, with 2 μ m active layer, exhibits low dark currents in the range of tens of nanoampere per square centimeter over a wide reversed biased range. The OPD demonstrates detectable light signal down to 0 .1 μ W cm − 2 and low dose detection capability. The coupling of perovskite QDs scintillator and OPD shows a sensitivity of 638 e nGy −1 mm −2 10 .2 μ C G y − 1 c m − 2 at a dose rate of 1 mGy s −1 , which brings the possibilities of realizing highly bendable x-ray PDs.

Source: Flexible and Printed Electronics

DOI: 10.1088/2058-8585/abe655