Researchers from Dongguan University of Technology have demonstrated a perovskite/graphene heterostructure that overcomes key challenges in metal-halide perovskite X-ray detectors, such as charge recombination caused by thick, defect-prone films.
By combining CsPbBr₃ perovskite’s strong X-ray absorption and photophysical performance with graphene’s ultrahigh carrier mobility (> 10⁴ cm²·V⁻¹·s⁻¹), the heterostructure achieves efficient charge transport and reduced non-radiative losses. A MAPbCl₃ buffer layer at the perovskite/Si interface further alleviates lattice mismatch and enhances adhesion by 10×.
The resulting device delivers a sensitivity of 4162 µC·Gyₐir⁻¹·cm⁻² (threefold higher than perovskite-only devices) and a record-low detection limit of 9.6 nGyₐir·s⁻¹, maintaining excellent operational stability.
This study establishes a pathway for high-sensitivity, stable, and scalable perovskite-based X-ray detectors for next-generation imaging technologies.
