Perovskites based Photon Counting X-ray Detectors

Perovskite photon counting detectors have emerged as a promising technology due to their exceptional optoelectronic properties, including high absorption coefficients to visible light and also to ionization radiation, long carrier recombination lifetime, tunable bandgaps, and defect tolerance. These features enable high sensitivity, low dark noise, and excellent energy resolution, making them ideal for applications in medical imaging, high-energy physics, security screening, and astronomy. I will present our recent progress on improving optimizing crystal growth, reduce device noise by defects manipulation, for both scintillator readout and direct photon counting using semiconductors. I will first report how to move perovskite photon-counting detectors from a promising concept toward practical devices by demonstrating high-sensitivity, low-noise detectors that can operate even without external bias and rival commercial silicon photomultipliers for photon counting. A parallel thrust in our research addresses materials challenges—stability and defect engineering (including chemical treatments and defect-repair strategies) to reduce deep and shallow traps and extend device lifetime—helping translate lab devices toward robust, large-area and clinical/industrial applications.