Low power paper electronics based wearable radiation detector using hybrid halide perovskite (MAPbBr₃): A real time monitoring of gamma ray

Abstract In this report we demonstrate that a paper based flexible gamma ray detector can be made using hybrid halide perovskite methyl ammonium lead bromide (CH3NH3PbBr3 or MAPB). The wearable paper based detector is solution processed and works at room temperature. It detects gamma ray by a direct method by change of its resistance on exposure to gamma ray and uses IDE (interdigitated electrodes) for boosting current response. This detector grown on a substrate like a paper with large active area, shows a maximum calibrated sensitivity of 5.26 μC Gy−1 cm−2 and a reasonable mobility—life time product ( μ τ ) ∼2 × 10−5 cm2 V−1. The detector can be operated in a wide range of gamma photon energy between 100 KeV to 1100 KeV and can detect radiation down to 0.01 μCi activity, which is noise limited. The paper detector shows a good shelf life of more than 6 months and a fast response time of a few seconds. The detector has a high degree of sustenance under exposure to high dose of Gamma radiation and was tested for a cumulative dose of minimum 1.6 KGy. The detector has low power consumption with can operate down to 1 V direct current (DC) bias and with a detector current of ∼1nA. The sensitivity increases with bias and shows saturation beyond 40 V bias. Such a low power flexible gamma detector is expected to have application potential in areas like health care and point of use quick radiation detection.