首页|Room temperature growth of CsPbBr3 single crystal for asymmetric MSM structure photodetector
Room temperature growth of CsPbBr3 single crystal for asymmetric MSM structure photodetector
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UV-visible broadband light harvesting ability is critical for photodetectors,and all inorganic perovskite CsPbBr3 is regarded as a promising candidate as the response active material.Herein,a saturated-solution crystallization method is employed to synthesize CsPbBr3 single crystal.Temperature-dependent photo-luminescence spectra with one-photon and two-photon excitation are systematically investigated,deter-mining a large exciton binding energy of 39.8 meV.This allows the stable excitonic emission of CsPbBr3 single crystal at room temperature.Subsequently,an asymmetric structure CsPbBr3 photodetector is fab-ricated by using InGa alloy as the Ohmic electrode and Au as the Schottky electrode.At-8 V,the device exhibits a prominent response to the irradiation from UV to green band with a maximum responsiv-ity of 2.56 A/W,an external quantum efficiency of 580％,and a detectivity of 1.24 × 1013 Hz1/2 W-1.In addition,the CsPbBr3 photodetector also presents rapid response speeds at both reverse and forward bias voltages and self-powered characteristics owing to the Schottky depletion layer underneath the Au electrode.The demonstration of asymmetric metal-semiconductor-metal(MSM)structure photodetector presents a promising pathway toward next-generation CsPbBr3 optoelectronic devices.
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