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Method for preparing high-luminous-efficiency inorganic perovskite thin film on basis of one-step method

A high luminous efficiency, inorganic calcium technology, applied in the direction of luminescent materials, chemical instruments and methods, electrical components, etc., can solve the problems of easy formation of heterogeneous phases, high requirements for preparation operations, and difficult diffusion, so as to promote thorough reaction and process The effect of low cost and high quantum yield

Inactive Publication Date: 2017-09-22
SUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During the immersion process, too long time will affect the growth quality of the film, and too short time will cause the precursors to fail to fully react and easily form impurity phases, which requires high preparation operations; in addition, CsBr has high thermal stability and is not easy to diffuse. The characteristics make the later heat treatment difficult, and it takes a long time of high temperature treatment to form the perovskite crystal phase. Therefore, the two-step soaking method cannot be used in inorganic CsPbX due to the limitations of practical applications. 3 The preparation of perovskite thin films has been promoted

Method used

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  • Method for preparing high-luminous-efficiency inorganic perovskite thin film on basis of one-step method
  • Method for preparing high-luminous-efficiency inorganic perovskite thin film on basis of one-step method
  • Method for preparing high-luminous-efficiency inorganic perovskite thin film on basis of one-step method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 0.0614g of PbBr 2 Add 0.0356g of CsBr into 0.5ml of DMSO, stir at room temperature until completely dissolved, and form PbBr 2 A perovskite precursor solution with a molar ratio of 1:1 to CsBr and a solution concentration of 15wt%.

[0032] Use a pipette gun to pipette 25 μl of the perovskite precursor solution, drop it slowly on the glass substrate, and spin-coat at 3000 rpm for 60 s to form a thin film.

[0033] The film was placed on a heating platform, and the inorganic perovskite film was prepared by heat treatment at 70°C for 15 minutes, and the sample was marked as a1.

Embodiment 2

[0035] Using the same process as in Example 1, the difference is that the PbBr of Example 1 2 The molar ratio of CsBr and CsBr was changed to 1:1.1, and other conditions remained the same, and the sample was marked as a2.

Embodiment 3

[0037] Using the same process as in Example 1, the difference is that the PbBr of Example 1 2 The molar ratio of CsBr and CsBr was changed to 1:1.2, and other conditions remained the same, and the sample was marked as a3.

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Abstract

The invention provides a method for preparing a high-luminous-efficiency inorganic perovskite thin film on basis of a one-step method. The method comprises the steps of: dissolving lead halide and cesium halide into a solvent to obtain perovskite precursor solution; and then after spin-coating the precursor solution, heating to obtain the high-luminous-efficiency inorganic perovskite thin film, wherein a molar ratio of the lead halide to the cesium halide is 1:1 to 1:3. The method has the characteristics of low cost, easiness for operation, low requirement for thermal processing temperature and the like, and is convenient for large-scale production of the perovskite thin film; and by limiting a precursor ratio, in the premise of not changing a perovskite crystal phase, luminous efficiency of the thin film is obviously promoted.

Description

technical field [0001] The invention relates to a method for preparing an inorganic perovskite material, in particular to a method for preparing an inorganic perovskite film with high luminous efficiency based on a one-step method. Background technique [0002] In the past few years, perovskite materials have shown great potential in the field of optoelectronic devices. Perovskite materials have the advantages of low manufacturing cost, high absorption coefficient, long carrier transport distance, and adjustable band gap. The organic-inorganic hybrid perovskite material CH 3 NH 3 wxya 3 (X is a halogen element) The solar cell prepared as a light absorbing layer has a photoelectric conversion efficiency of more than 20%. At the same time, as a high-efficiency semiconductor light-emitting material, perovskite has also made a series of breakthroughs in the fields of electroluminescent devices, lasers, and light detection. However, traditional hybrid perovskite materials are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/032C09K11/66C03C17/22
CPCH01L31/032C03C17/22C09K11/665
Inventor 孙洪涛周阳雍自俊马桔萍陈雅蒙
Owner SUZHOU UNIV
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