Quantum Efficiency Gain in 2D Perovskite Photo and X‐Ray Detectors

Abstract The perovskite polycrystalline thin film detector fabricated by solution method is a promising low‐cost, scalable technology for radiation imaging, but its volume limits the sensing efficiency high‐energy X‐ray photons. This work reports 2D photo‐diodes with detection gain when visible and Detailed power temperature‐dependent device characterizations reveal charge multiplication effect to be responsible observed high gain. caused disparity in electron hole transport, where transport retarded trap/de‐trap process via shallow trap states, whereas fast enough produce photoconductive satisfying neutrality. made butylamine spacers also found exhibit larger than those phenylethylamines because of higher likelihood forming traps former. diodes feature temporal response over 1 MHz due collection across volume, discovery provides physics mechanisms connection material structure‐function relationship future optoelectronics design that can boost dim light detection.