X-ray photon counting detectors based on FAPbBr3

Abstract

Single-crystal metal–halide perovskites offer a compelling path toward photon-counting x-ray detectors that combine high stopping power, low-cost solution growth, and excellent charge-transport properties. In this talk, I will focus on the device physics and engineering requirements for perovskite single-crystal photon counting detectors, emphasizing how deep defects, ion migration, and contact injection jointly determine dark count rate, pulse-height stability, and energy discrimination. I will discuss strategies to reduce defects and improve operational stability drift under sustained bias and irradiation, including bulk defect/compensation control, surface/interface passivation, and blocking-contact/barrier design that reduces carrier injection while preserving efficient charge collection. Finally, I will outline scalable routes to pixelated arrays and CMOS/ASIC readout integration, and propose reliability test protocols relevant to practical photon-counting CT and spectral imaging.