Achieving Stable Perovskite X-ray Imaging Consistency via Constructing Heterojunction Architecture

Polycrystalline perovskites have demonstrated their potential for advanced direct X-ray imaging applications. However, achieving superior X-ray imaging quality remains a critical challenge. Consistency in imaging results across different time points and multiple test acquisitions is essential for reliable analysis and accurate diagnostic outcomes. Here, we constructed a migration ion barrier via a 3D/3D heterojunction and discovered a correlation between material-level properties and back-end imaging performance, translating the dark current behavior on image quality into measurable outcomes. Due to the blocking effect of the heterojunction structure and the energy band barrier in the space-charge region. This design effectively alleviates ionic migration and ensures controllable dark currents. The device demonstrates excellent imaging consistency at a low photo response non-uniformity (PRNU) value of 1.90% and a high spatial resolution of 4.23 lp mm–1. It effectively preserves image features during high-frequency acquisition within 30 min and maintains high-quality imaging performance over extended operational durations. This approach provides valuable guidance for high-quality X-ray imaging.