Growth window optimization for large-size quasi two-dimensional Dion-Jacobson type perovskite

Abstract

Quasi-2D DJ type perovskites theoretically offer excellent properties for X-ray detection, but they often face issues such as phase segregation and small crystal size. In this study, we synthesized large single crystals of quasi-2D DJ type perovskite (3AMPY)(MA)Pb2Br7 using temperature-controlled crystallization. The resulting X-ray detector exhibited high resistivity (1.78×109 Ω·cm), a carrier mobility-lifetime (μτ) product of 9.32×10-4 cm²·V-1, a dark current of 5.6×10-8 A·cm-2·V-1, and a sensitivity of 129.86 μC·Gy-1·cm-2.These results demonstrate the potential of quasi-2D DJ type perovskites for high-performance X-ray detection and provide insights into improving crystal growth for optoelectronic applications.