Researchers from Dongguan University of Technology have developed a high-performance X-ray detector based on a graphene/perovskite heterostructure, addressing the limitations of traditional perovskite detectors that suffer from charge recombination in thick and defect-rich films.
By exploiting graphene’s exceptional carrier mobility (> 10⁴ cm²·V⁻¹·s⁻¹), the device achieves efficient charge transport and reduced non-radiative recombination at the interface with CsPbBr₃. Incorporating a MAPbCl₃ buffer layer minimizes lattice mismatch at the perovskite/Si interface, enhancing mechanical adhesion by an order of magnitude.
The optimized device achieves a sensitivity of 4162 µC·Gyₐir⁻¹·cm⁻² - three times higher than perovskite-only detectors - and a detection limit of 9.6 nGyₐir·s⁻¹, alongside exceptional operational stability.
This work underscores graphene’s potential as a high-mobility transport layer for next-generation X-ray detectors with superior sensitivity and long-term reliability.
