Abstract
Metal halide perovskites have emerged as excellent direct X‐ray detection materials owing to their large mobility‐lifetime product, strong radiation absorption, and low‐cost preparation. However, it is still a challenge to achieve stable X‐ray detection due to the limitations associated with severe ion migration under high voltage bias. Herein, based on a bromine substitution strategy to suppress ion migration, a 2D alternating cations intercalation‐type (ACI) perovskite, (R‐MPA)(BrEA)PbBr4 (1, R‐MPA = methylphenethylamm‐onium; BrEA = 2‐bromoethylamine) is reported to achieve X‐ray detection. Specifically, introducing Br atom forms additional intermolecular interactions (i.e., Br···π) and enhances hydrogen bonding interactions, greatly improving the structure stability. Based on this enhanced interaction, 1 presents a higher activation energy of ion migration (1.05 eV) than that of (R‐MPA)EAPbBr4 resulting in a lower dark current drift of 9.17 × 10−8 nA cm−1 s−1 V−1, revealing that suppression of ion migration. Consequently, the 1‐based detector shows a high sensitivity of 2653.7 μC Gy−1 cm−2 and, most importantly, outstanding operational and environmental stability, maintaining ≈91% of its initial sensitivity at 50 V bias after 90 days in the air. This work demonstrates an efficient strategy for introducing halogen interactions via ACI to suppress ion migration for stable X‐ray detection.
Published Version
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