Medical X-ray imaging demands detectors that are both ultra-sensitive and stable under high bias, yet ion migration and surface defects still plague 3-D perovskites. A Shenzhen Technology University-led team (Prof. Shuang Xiao & Prof. Xingzhu Wang) now reports a one-step gas-phase route that grows nanometre-thin, pin-hole-free 2-D (PA) 2 PbBr 4 or (HDA)PbBr₄ capping skins directly onto MAPbBr₃ single crystals in <1 min. The resulting 2-D/3-D heterojunction delivers a record sensitivity of 22 245 µC Gyₐᵢᵣ -1 cm -2 , 240 µs response time and a dark-current drift only 1.17 × 10 -4 nA cm -1 s -1 V -1 —beating the world’s best perovskite X-ray detectors by >10× in signal stability.
Why This Matters
Innovative Design & Features
Applications & Future Outlook
By turning a simple vapor cue into an atomically precise ionic barrier, the work delivers the first perovskite X-ray detector that unites hospital-grade sensitivity, microsecond speed and rock-solid baseline—paving the way for safer, sharper and greener medical imaging anywhere the beam shines.
Nano-Micro Letters
News article
Gas‑Phase Construction of Compact Capping Layers for High‑Performance Halide Perovskite X‑Ray Detectors
20-Dec-2025