All inorganic perovskite CsPbX_(3)with excellent optical properties and a tunable bandgap is a potential candidate for optoelectronic applications,and the amplified spontaneous emission(ASE)is normally reported in low...All inorganic perovskite CsPbX_(3)with excellent optical properties and a tunable bandgap is a potential candidate for optoelectronic applications,and the amplified spontaneous emission(ASE)is normally reported in low-dimensional structures where the quantum confinement enhances ASE.Herein,we not only demonstrate the ASE in millimeter size CsPbCl_(x)Br_(3-x)crystal with a high defect concentration,but also tune the emission wavelength from the green band to blue band through the ion exchange of Br with Cl.The ASE centered at∼456 nm is probed at 50 K with a threshold of 106μJ/cm 2.Furthermore,a metal-semiconductor-metal(MSM)structure CsPbCl_(x)Br_(3-x)photodetector is fabricated and shows a distinct response to lights from UV to the blue band;the response spectrum range is quite different from the narrow band(∼30 nm)response of the CsPbBr_(3)photodetector induced by a charge collection narrowing(CCN)mechanism.The CsPbCl_(x)Br_(3-x)photodetector also exhibits fast response speeds with a rise time of 96μs and a decay time of 34μs,indicating the defects have limited influence on the transportation speed of the photo-generated carriers.展开更多
基金National Natural Science Foundation of China(52172149)Youth S&T Talent Support Programme of Guangdong Provincial Association for Science and Technology(SKXRC202405)Guangdong Provincial Key Laboratory Project(High-Performance Integrated Circuits and Systems Laboratory,2023KSYS003)。
文摘All inorganic perovskite CsPbX_(3)with excellent optical properties and a tunable bandgap is a potential candidate for optoelectronic applications,and the amplified spontaneous emission(ASE)is normally reported in low-dimensional structures where the quantum confinement enhances ASE.Herein,we not only demonstrate the ASE in millimeter size CsPbCl_(x)Br_(3-x)crystal with a high defect concentration,but also tune the emission wavelength from the green band to blue band through the ion exchange of Br with Cl.The ASE centered at∼456 nm is probed at 50 K with a threshold of 106μJ/cm 2.Furthermore,a metal-semiconductor-metal(MSM)structure CsPbCl_(x)Br_(3-x)photodetector is fabricated and shows a distinct response to lights from UV to the blue band;the response spectrum range is quite different from the narrow band(∼30 nm)response of the CsPbBr_(3)photodetector induced by a charge collection narrowing(CCN)mechanism.The CsPbCl_(x)Br_(3-x)photodetector also exhibits fast response speeds with a rise time of 96μs and a decay time of 34μs,indicating the defects have limited influence on the transportation speed of the photo-generated carriers.
