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Method for preparing inorganic lead-free halide perovskite film by coevaporation

A halide perovskite and inorganic non-ferrous technology, which is applied in the field of co-evaporation to prepare inorganic non-lead halide perovskite thin films, can solve problems such as Pb pollution and organic instability, and achieve smooth surface, less internal defects, and better performance. unstable effect

Inactive Publication Date: 2017-01-04
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing inorganic non-lead halide perovskite films by co-evaporation, which mainly solves the problems of organic matter instability and Pb pollution in existing organic-inorganic metal compound perovskite

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  • Method for preparing inorganic lead-free halide perovskite film by coevaporation
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  • Method for preparing inorganic lead-free halide perovskite film by coevaporation

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Embodiment

[0028] The invention provides a kind of inorganic non-lead halide (chemical formula is CsSnX 3 or Cs 2 wxya 6 , X is one or more of the halogen elements Cl, Br or I) perovskite thin films, which are mainly used in perovskite batteries. The present invention adopts figure 1 The co-evaporation equipment shown is for the preparation of inorganic non-lead halide perovskite thin films, the co-evaporation equipment includes a vacuum chamber 1, a CsX evaporation source 2, a SnX 2 Evaporation source 3, sample baffle plate 4, sample rack 5 with heating, sample rotation axis 6, the CsX evaporation source 2, SnX 2 The evaporation source 3, the sample baffle plate 4 and the sample holder 5 with heating are all arranged in the vacuum chamber 1, wherein X is one or more of Cl, Br, and I; the sample rotation axis 6 is in contact with the sample rack 5 is connected for rotating to open the vacuum chamber 1, such as figure 1 indicated by the rotation arrow in .

[0029] Such as figure ...

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Abstract

The invention discloses a method for preparing an inorganic lead-free halide perovskite film by coevaporation. The method comprises the following steps: (1) carrying out ultrasonic cleaning on a substrate material, and blow-drying with nitrogen for later use; (2) putting the substrate material on a coevaporation plant sample holder, vacuumizing the vacuum chamber until the vacuum degree is less than 5*10<-4>Pa, heating and rotating the substrate material, and keeping the temperature; (3) regulating the temperatures of a CsX evaporation source and an SnX2 evaporation source so that the CsX evaporation source and SnX2 evaporation source control the evaporation rate of the substrate material together; and (4) after the temperatures of the evaporation sources reach the set values and the evaporation rates become stable, carrying out double-source coevaporation deposition of the inorganic lead-free halide perovskite film, and cooling to room temperature, thereby obtaining the inorganic lead-free halide perovskite film. The inorganic lead-free halide perovskite film has the advantages of high stability, low cost, smooth surface, fewer internal defects, technique repeatability, environment friendliness and no pollution, and is suitable for large-scale industrialized production.

Description

technical field [0001] The invention relates to the technical field of photovoltaic cells, in particular to a method for preparing inorganic non-lead halide perovskite thin films by co-evaporation. Background technique [0002] Halide-based perovskite has the characteristics of excellent light absorption ability, considerable ambipolar carrier mobility, and ultra-long electron-hole diffusion length, and it has gradually become one of the most important research hotspots in the field of photovoltaics today. one. The main organo-inorganic metal compound of the current halide perovskites is methylamine lead iodide (CH 3 NH 3 wxya 3 , X is one or more of Cl / Br / I), the main synthetic component of methylamine lead iodide is methylamine halide (CH 3 NH 3 X) It is easily hydrolyzed when exposed to water, resulting in extremely unstable performance of methylamine lead iodine perovskite, and methylamine lead iodine perovskite contains toxic Pb element, so this also limits perovsk...

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Application Information

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IPC IPC(8): C23C14/06C23C14/24
CPCC23C14/0694C23C14/24
Inventor 杨盼杨丽军赵晓冲王劲川杨蕊竹
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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