Fast Photopolymerization-Enabled Heterogeneous Bonding for Perovskite Single Crystal-Integrated X-ray Detectors

Perovskite single crystals (PSCs) are highly promising direct X-ray detection materials, whereas the mechanical brittleness and thermal instability easily bring about stress cracking and structural decomposition under a conventional bonding process, hindering integrated applications. In this work, we developed a photopolymerization-induced heterogeneous bonding technology based on 4-acryloylmorpholine (ACMO) for monolithic PSC integration, which enables effective bonding within seconds via a liquid film transfer method. The interfacial coordination effect between ACMO and PSCs simultaneously achieves defect passivation for the buried surface of PSCs and robust mechanical bonding with tensile and shear strengths of up to 1.81 and 1.50 MPa, respectively. Furthermore, polymerized ACMO has a high resistivity of 7.72 × 10¹² Ω·cm that effectively suppresses dark current in the integrated devices. Compared with the control crystal, the dark current of the integrated device is reduced by 2 orders of magnitude, while the limit of detection (LOD) for X-ray detection improves 20-fold. The 5.6% relative standard deviation of dark currents among 6 × 6 pixels and 96% performance retention after 30 days of storage confirm the reliable uniformity and stability. This work provides a novel technical solution for the heterogeneous bonding of PSCs, facilitating the further development of high-performance PSC-integrated optoelectronic devices.