Reconfigurable Pb-Free Perovskite Array for X-Ray In-Sensor Computing

Conventional X-ray imaging architectures feature data redundancy and hardware consumption due to the separated sensory terminal and computing units. Insensor computing architectures are promising to overcome such drawbacks. However, its realization in the X-ray range remains elusive. We propose an ion distributioninduced reconfigurable mechanism and demonstrate the X-ray band in-sensor computing array based on Pb-free perovskite. Redistribution of Br- ion in perovskite induces the switching of positive and negative (PN) and NP modes under electrical pooling. X-ray detection sensitivity can be switched between two stable self-power sensing modes with 4373 +/- 298 and -7804 +/- 429 mu C Gy(air)(-1) cm(-2), respectively, which are superior to that of commercial aSe detectors (20 mu C Gy(air)(-1) cm(-2)). Both modes exhibit a low detection limit of 48.4 nGyair s-1, which is two orders lower than the typical medical dose rate of 5.5 mu Gy(air)(-1) cm(-2). The perovskite array sensors can integrate with thin-film transistors (TFTs) with low-temperature (80 degrees C) process, in which the photocurrent distribution under irradiation shows good uniformity. An in-sensor computing algorithm of attention mechanism is performed on array sensors for chest X-ray images disease recognition, which enables an accuracy improvement of up to 98.2%. Our results can pave the way for future intelligent X-ray imaging.