Self-powered X-ray detectors based on lead halide perovskites(LHP_(s))have recently gained increased traction due to their low energy consumption and easy fabrication.However,the toxicity of lead in LHP_(s)threatens h...Self-powered X-ray detectors based on lead halide perovskites(LHP_(s))have recently gained increased traction due to their low energy consumption and easy fabrication.However,the toxicity of lead in LHP_(s)threatens human and environmental safety,which hinders their commercialization.Herein,an eco-friendly self-powered X-ray detector has been successfully fabricated using a multilayered double perovskite ferroelectric(C_(6)H_(5)CH_(2)NH_(3))_(2)CsAgBiBr_(7)(1).The intrinsic ferroelectric spontaneous polarization property(P_(s)=3.19μC cm^(-2))in 1 generates an impressive polar photovoltage of 0.5 V,which provides an ideal driving force for exciton dissociation within the material,enabling X-ray detection without an external power source.The X-ray detector based on 1 shows a high sensitivity of 47.2μC Gy^(-1)cm^(-2)and an extremely low X-ray detection limit of 716 nGy s^(-1)at 0 V bias.Additionally,under an applied bias of 50 V,the sensitivity increases to 1154.8μC Gy^(-1)cm^(-2),surpassing that of most halide double perovskite detectors.This work sheds light on the great potential of multilayered double perovskite ferroelectrics for cost-effective“green”self-powered X-ray detectors.展开更多
基金financially supported by the National Natural Science Foundation of China(22435005,22193042,22201284,22305105,22125110,22122507,and U21A2069)the Jiangxi Provincial Natural Science Foundation(20252BAC200222,20242BAB25129,and 20224BAB213003)+2 种基金the Natural Science Foundation of Fujian Province(2023J05076)the Jiangxi Provincial Education Department Science and Technology Research Foundation(GJJ2200384)Natural Science Foundation of Shandong Province(ZR2023QB005).
文摘Self-powered X-ray detectors based on lead halide perovskites(LHP_(s))have recently gained increased traction due to their low energy consumption and easy fabrication.However,the toxicity of lead in LHP_(s)threatens human and environmental safety,which hinders their commercialization.Herein,an eco-friendly self-powered X-ray detector has been successfully fabricated using a multilayered double perovskite ferroelectric(C_(6)H_(5)CH_(2)NH_(3))_(2)CsAgBiBr_(7)(1).The intrinsic ferroelectric spontaneous polarization property(P_(s)=3.19μC cm^(-2))in 1 generates an impressive polar photovoltage of 0.5 V,which provides an ideal driving force for exciton dissociation within the material,enabling X-ray detection without an external power source.The X-ray detector based on 1 shows a high sensitivity of 47.2μC Gy^(-1)cm^(-2)and an extremely low X-ray detection limit of 716 nGy s^(-1)at 0 V bias.Additionally,under an applied bias of 50 V,the sensitivity increases to 1154.8μC Gy^(-1)cm^(-2),surpassing that of most halide double perovskite detectors.This work sheds light on the great potential of multilayered double perovskite ferroelectrics for cost-effective“green”self-powered X-ray detectors.
