Lead-halide perovskites have made great advances in direct X-ray detection due to their large mobility-lifetime(μτ),strong X-ray absorption,and ease of synthesis,but the presence of toxic lead and high ionic migrati...Lead-halide perovskites have made great advances in direct X-ray detection due to their large mobility-lifetime(μτ),strong X-ray absorption,and ease of synthesis,but the presence of toxic lead and high ionic migration severely limit their commercial applicability and operational stability.In this study,we substituted toxic Pb^(2+)with Bi^(3+)and Mn^(2+)for preparing eco-friendly two-dimensional lead-free perovskite Cs_(4)MnBi_(2)Cl_(12)single crystal(SC)by a hydrothermal method.The SC possesses smooth surface,good crystallinity,highμτ(1.8×10^(-3)cm^(2)·V^(-1)),and excellent stability.Therefore,the X-ray detector prepared with the Cs_(4)MnBi_(2)Cl_(12)SC achieved an extraordinary sensitivity of 2.1×10^(3)μC·Gyair^(-1)·cm^(-2)and a low limit-of-detection of 1.05 nGyair·s-1.Notably,the detector demonstrates remarkable operational stability,maintaining its original X-ray response even after 6 months of unsealed storage in air,and can function effectively at elevated temperatures up to 100℃,making it highly suitable for application in harsh environments.Moreover,the SC detector achieves high-resolution X-ray imaging because of its outstanding X-ray detection performance.This study not only verifies the feasibility of Cs_(4)MnBi_(2)Cl_(12)SC for high-performance X-ray detection and imaging but also provides new design for preparation of eco-friendly X-ray detectors with both high sensitivity and stability.展开更多
基金support from the National Key R&D Program of China(No.2022YFB28033900)the National Natural Science Foundation of China(Nos.U24A20292 and 12204426)+1 种基金the Support Program for Scientific and Technological Innovation Teams of Higher Education in Henan Province(No.23IRTSTHN011)the Foundation of basic research for young teachers of Zhengzhou University(No.JC23549005).
文摘Lead-halide perovskites have made great advances in direct X-ray detection due to their large mobility-lifetime(μτ),strong X-ray absorption,and ease of synthesis,but the presence of toxic lead and high ionic migration severely limit their commercial applicability and operational stability.In this study,we substituted toxic Pb^(2+)with Bi^(3+)and Mn^(2+)for preparing eco-friendly two-dimensional lead-free perovskite Cs_(4)MnBi_(2)Cl_(12)single crystal(SC)by a hydrothermal method.The SC possesses smooth surface,good crystallinity,highμτ(1.8×10^(-3)cm^(2)·V^(-1)),and excellent stability.Therefore,the X-ray detector prepared with the Cs_(4)MnBi_(2)Cl_(12)SC achieved an extraordinary sensitivity of 2.1×10^(3)μC·Gyair^(-1)·cm^(-2)and a low limit-of-detection of 1.05 nGyair·s-1.Notably,the detector demonstrates remarkable operational stability,maintaining its original X-ray response even after 6 months of unsealed storage in air,and can function effectively at elevated temperatures up to 100℃,making it highly suitable for application in harsh environments.Moreover,the SC detector achieves high-resolution X-ray imaging because of its outstanding X-ray detection performance.This study not only verifies the feasibility of Cs_(4)MnBi_(2)Cl_(12)SC for high-performance X-ray detection and imaging but also provides new design for preparation of eco-friendly X-ray detectors with both high sensitivity and stability.
