Enabling Sensitive and Stable X-ray Detection in a 2D Trilayered Hybrid Perovskite with Strong F–π Interactions

Organic-inorganic hybrid perovskites integrate the advantages of organic and inorganic components, making them promising candidates for high-performance X-ray detection. However, severe ion migration under external voltage makes it a tough challenge to realize high sensitivity and operational stability simultaneously in practical application. Here, we report a two-dimensional (2D) trilayered hybrid perovskite with F-substituted aromatic spacers, (FBZA)₂(MA)₂Pb₃Br₁₀ (1, FBZA = 4-fluorobenzylamine, MA = methylamine). The thick inorganic slabs endow 1 with efficient carrier transport paths, achieving a superior mobility-lifetime product of 1.3 × 10⁻³ cm² V⁻¹, much higher than most of 2D perovskites. Indeed, a high sensitivity of 2818.2 μC Gy⁻¹ cm⁻² and a low detection of limit (LOD) of 43.7 nGy s⁻¹, as well as a low dark current drift of 1.61 × 10⁻⁷ nA cm⁻¹ s⁻¹ V⁻¹ under a bias of 100 V, suggests its great potential on sensitive and stable X-ray detection. The stable and reliable response to long-time X-ray irradiation of high dose rate under large working voltage further verifies its operational stability. This research develops a multilayered 2D perovskite with strong interlayer interactions, successfully achieving high-sensitivity and high-stability X-ray detection, which sheds light on the design and construction of high-performance perovskite-based X-ray detectors in the future.