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 (μτ) ∼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.