Graphene-Perovskite composite structure facilitates High-Performance X-ray detectors with low detection limits
Year: 2025
Type: article
Abstract: Metal-halide perovskite X-ray detectors offer a low-cost platform for direct detection across a broad high-energy spectrum. However, the large thickness and the high defect density of the perovskite thick films increase recombination, resulting in performance bottlenecks. Herein, we demonstrate a high-performance X-ray detector featuring a perovskite/graphene heterostructure that synergistically combines graphene’s high carrier mobility (> 10⁴ cm²·V⁻¹·s⁻¹) with perovskite’s exceptional photophysics properties. The bulk heterojunction formed between CsPbBr₃ and graphene facilitates efficient charge transport and suppresses non-radiative recombination. Additionally, a MAPbCl₃ buffer layer reduces lattice mismatch at the perovskite/Si interface, enhancing mechanical adhesion by 10 times. The optimized device achieves a sensitivity of 4162 µC·Gyₐ i r ⁻¹·cm⁻² (3× higher than perovskite-only devices) and a record-low detection limit of 9.6 nGyₐ i r ·s⁻¹ (60× improvement), alongside exceptional operational stability. This work establishes a paradigm for developing high-sensitivity, high-stability, and low-cost perovskite X-ray detectors.
Authors: Ciyu Liu, Yi Luo, Runhao Chen, Wenyi Wu, Hai Zhou
Institution: Dongguan University of Technology
Language: English
Subfield: Radiation
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,490
OpenAlex ID: W7117550846