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Preparation method for in-situ growth of organic passivation film on surface of organic-inorganic hybrid perovskite methylamine lead iodide

A methylamine lead iodide and a technology for preparing methylamine lead iodide are used in semiconductor/solid-state device manufacturing, semiconductor devices, electrical components, etc., and can solve the problems of weak stability of perovskite and improve stability. Effect

Active Publication Date: 2021-01-05
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In summary, there are the following problems in the prior art: the stability of perovskite is weak

Method used

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  • Preparation method for in-situ growth of organic passivation film on surface of organic-inorganic hybrid perovskite methylamine lead iodide
  • Preparation method for in-situ growth of organic passivation film on surface of organic-inorganic hybrid perovskite methylamine lead iodide

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preparation example Construction

[0024] The invention provides a method for preparing an organic passivation film grown in situ on the surface of an organic-inorganic hybrid perovskite methylamine lead iodide. The overall process is as follows:

[0025] (1) Ammonium iodide and lead iodide are 1-10 according to the molar ratio, are dissolved in anhydrous N,N-dimethylformamide, form bright yellow solution, add chlorobenzene, described bright yellow solution and The volume ratio of chlorobenzene is 5:1, forming a white flocculent precipitate, and drying the white flocculent precipitate on a heating table at a temperature of 60-80°C until the white precipitate turns black completely to obtain methylamine lead iodide powder ;

[0026] (2) the methylamine lead iodide powder prepared by step (1) is dissolved in the HI solution of 2-6mL, until the black precipitate is separated out again in the HI solution, obtains the preparation of methylamine lead iodide passivation film in situ supersaturated solution;

[0027]...

Embodiment 1

[0030] (1) Weigh 1 g of methyl ammonium iodide and mix it with 0.5 g of lead iodide, add 10 mL of N,N-dimethylformamide, and then add 100 mL of chlorobenzene to the solution to obtain a white precipitate. The obtained white precipitate is placed on a heating table and dried at a drying temperature of 70°C until the white precipitate completely turns black to obtain methylamine lead iodide;

[0031] (2) the methylamine lead iodide black powder prepared in step 1 is dissolved in 15mL HI solution;

[0032] (3) Take 50 μL of the supersaturated HI solution prepared in step 2 and add it dropwise to 100 mg of the methylamine lead iodide powder prepared in step 1, grind rapidly, and light for 3 hours to obtain methylamine iodide with a passive film on the surface. lead.

[0033] Such as figure 2 Shown, do not contain protective film and contain the methylamine lead iodide of protective film to expose in the air for 28 days, can obtain the methylamine lead iodide that does not conta...

Embodiment 2

[0035] (1) Weigh 1 g of methyl ammonium iodide and mix it with 0.5 g of lead iodide, add 10 mL of N,N-dimethylformamide, and then add 100 mL of chlorobenzene to the solution to obtain a white precipitate. The obtained white precipitate is placed on a heating table and dried at a drying temperature of 70°C until the white precipitate completely turns black to obtain methylamine lead iodide;

[0036] (2) the preparation of methylamine lead iodide saturated HI solution is with embodiment 1;

[0037] (3) Take 60 μL of the methylamine lead iodide supersaturated HI solution prepared in step 2 and add it dropwise to 200 mg of the methylamine lead iodide powder prepared in step 1, grind rapidly, and light for 3 hours to obtain methylamine with a passive film on the surface. Ammonium lead iodide.

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Abstract

The invention discloses a preparation method for in-situ growth of an organic passivation film on the surface of organic-inorganic hybrid perovskite methylamine lead iodide, and the preparation methodcomprises the following steps: A, dissolving methylamine iodide and lead iodide in anhydrous N, N-dimethylformamide to form a bright yellow solution, adding chlorobenzene to form a white flocculent precipitate, and drying the white flocculent precipitate in a heating table until the white precipitate is completely blackened to obtain methylamine lead iodide powder; B, dissolving the methylamine lead iodide powder in an HI solution until black precipitates are separated out of the HI solution again, and obtaining a supersaturated solution for in-situ preparation of the methylamine lead iodidepassivation film; and C, dropwise adding the supersaturated HI solution obtained in the step B into the methylamine lead iodide powder prepared in the step A, grinding, and illuminating to obtain methylamine lead iodide with an organic passivation film on the surface.

Description

technical field [0001] The invention relates to the field of photovoltaics, in particular to a preparation method for in-situ growth of an organic passivation film on the surface of an organic-inorganic hybrid perovskite methylamine lead iodide. Background technique [0002] At present, there are some technical methods to prepare passivation film on the surface of perovskite to enhance the stability of perovskite, for example, passivate the surface defects of perovskite through organic molecules to enhance its stability; through in-situ reaction with specific inorganic anions , forming a thin and dense inorganic protective film on the perovskite surface. [0003] The following problems exist in the prior art: 1) The chemical bond between the passivation molecule and the perovskite surface is weak, and it is difficult to protect MAPbI3 from water and oxygen attack; 2) The chemical combination and physical coverage cannot completely cover the perovskite crystal , perovskite d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/48H01L51/44
CPCH10K71/00H10K30/88Y02E10/549
Inventor 王梦晔
Owner SUN YAT SEN UNIV