CsPbBr3 fully-inorganic perovskite nano wire based visible light photoelectric detector and preparation method thereof

Abstract

The invention provides a CsPbBr3 fully-inorganic perovskite nano wire based visible light photoelectric detector and a preparation method thereof. The detector structurally comprises transparent glass, a CsPbBr3 perovskite nano wire film and Au, and the CsPbBr3 perovskite nano wire film synthesized in a soap-free solution method and an ion exchange method serves as a perovskite light absorption layer. The detector is high in on / off ratio and water and oxygen stability, and the photoelectric current attenuation amplitude is lower than 4.9% when the detector is placed in the atmospheric environment at the average temperature of 32 DEG C and the average relative humidity of 75% for 200h; light-dark current of the detector is not attenuated obviously after that the detector is irradiated continuously for 10000s by ultraviolet light in the intensity of 2.2mW cm<-2>; and the detector can detect visible light within the detection range of 300-540nm. The detector is simple in manufacturing technology, low in cost, and suitable for batch and industrialized production. The dark current of the detector is as low as 100pA, and energy can be saved. The prepared detector has higher responsibility and detection sensitivity.

Description

technical field [0001] The invention relates to the technical field of semiconductor nanometer materials and photoelectric detectors, in particular to the preparation of all-inorganic perovskite nanowire films by combining a soap-free solution method and an ion exchange method. A photodetector of visible light with high performance is prepared by different nanowire growth time and different annealing temperature. Background technique [0002] In recent years, halide perovskite materials have received extensive attention in the fields of solar cells, light-emitting diodes, and other optoelectronic devices due to their wide range of wavelength tunability and high carrier diffusion length. [1,2] . For detectors, organic-inorganic materials have attracted much attention due to their advantages such as simple preparation process and low energy consumption for visible light detection. Organic-inorganic hybrid perovskite combines N-type materials and P-type materials to form a PI...

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Problems solved by technology

There have been many reports on cesium lead bromine nanowires before. In these reports, most of them use the traditional one-pot method to produce ultra-fine nanowires, but when they are assembled into thin films, complex vacuum coating technology is required; some reports The purity of nanowires can be improved by several high-speed centrifugation, but the ligands may be destroyed; some even need to synthesize nanocrystals first and then synthesize nanowires, and it is easy to produce additional nanosheets in the process

These reports on cesium lead bromine nanowires show that the synthesis of inorganic cesium lead bromine nanowires relies on harsh conditions, complex processes and sophisticated instruments [7] , and the synthesized nanowires are not enough to make high-performance photodetectors

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