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Method for preparing large size lead halide cesium perovskite crystal

A lead halide cesium perovskite, large-scale technology, applied in chemical instruments and methods, inorganic chemistry, lead compounds, etc., can solve the problems of low yield, high cost, and inability to prepare on a large scale, and achieve high yield, The effect of stable properties and simple equipment

Inactive Publication Date: 2017-07-11
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is necessary to prepare large-scale all-inorganic perovskite materials on a large scale. However, due to the need for protective gas and high temperature conditions, the cost is high and the yield is low, so it cannot be prepared on a large scale.

Method used

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  • Method for preparing large size lead halide cesium perovskite crystal
  • Method for preparing large size lead halide cesium perovskite crystal
  • Method for preparing large size lead halide cesium perovskite crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Weigh 0.147g PbBr 2 Dissolve in 5mL of dimethylamide (DMF), stir until completely dissolved;

[0033] (2) Weigh out 0.0851g of CsBr and dissolve it in 5mL of dimethylamide (DMF) and add surfactants (0.5mL of oleic acid and 0.25mL of oleylamine), and heat the solution to 150°C for 1 hour at a constant temperature, and then cool to Room temperature

[0034] (3) The obtained 5mLPbBr 2 The solution was preheated to 50℃, and then added to the prepared 5ml cesium salt solution (Cs + : Pb 2+ The molar ratio is 1:1), the mixed solution is gradually heated to 70°C, and after reacting for 3 hours, a precursor solution is obtained;

[0035] (4) Take 1mL of the precursor solution and drop it into 10mL of n-hexane at a rate of 0.1ml / s. After stirring at a constant speed, the solution is gradually heated to 50°C and kept at a constant temperature to evaporate for 5 hours. An orange-red color can be observed at the bottom of the solution. Crystals precipitated;

[0036] (5) After the sol...

Embodiment 2

[0038] Use detergent, deionized water, alcohol, acetone, and isopropanol to ultrasonically clean the substrate material in sequence for 5 minutes each time.

[0039] (1) Dissolve the prepared large-size lead cesium halide perovskite crystals in an organic solvent, and stir magnetically until they are completely dissolved, with a concentration of 0.1 mol / L;

[0040] (2) Stir the above solution for 24 hours at 50°C and protected from light to obtain a large-size lead cesium halide perovskite crystal solution;

[0041] (3) Ultrasonic cleaning of the substrate material, and then drying with nitrogen;

[0042] (4) Put the thoroughly dried material in an ultraviolet ozone cleaner for 10 minutes;

[0043] (5) Spread 50 μL of large-size lead cesium halide perovskite crystal solution on the bottom surface of the substrate material, spin coating for 5 seconds, and spin coating at a speed of 3000 revolutions per second;

[0044] (6) The spin-coated material is heated at 50° C. for 100 minutes, and ...

Embodiment 3

[0046] Use detergent, deionized water, alcohol, acetone, and isopropanol to ultrasonically clean the substrate material in sequence for 15 minutes each time.

[0047] (1) Dissolve the prepared large-size lead cesium halide perovskite crystals in an organic solvent, and stir magnetically until they are completely dissolved, with a solubility of 5mol / L;

[0048] (2) Stir the above solution for 2 hours at 100°C and protected from light to obtain a large-size lead cesium halide perovskite crystal solution;

[0049] (3) Ultrasonic cleaning of the substrate material, and then drying with nitrogen;

[0050] (4) Put the thoroughly dried material in an ultraviolet ozone cleaner for 60 minutes;

[0051] (5) Spread 150μL of large-size lead cesium halide perovskite crystal solution on the bottom surface of the substrate material, spin-coating for 50s, and spin-coating at a speed of 3000 rpm;

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Abstract

The invention discloses a method for preparing a large size lead halide cesium perovskite crystal, wherein the crystal structure is CsPbX3, and X = Cl, Br or I. The large size lead halide cesium perovskite crystal is prepared by constant temperature evaporation without a protect gas in the whole process, equipment is simple, and the large size lead halide cesium perovskite crystal can be produced on a large scale. The prepared large-size lead halide cesium perovskite crystal has the advantages of high yield and good stability, and can be used in photoelectric research fields of solar cells, photodetectors, light emitting diodes, and the like.

Description

Technical field [0001] The invention relates to a method for preparing large-size lead cesium halide perovskite crystals, and belongs to the technical field of photoelectronic material preparation. Background technique [0002] In recent years, as a new type of semiconductor optoelectronic materials, perovskite materials have aroused great interest in academia and industry. Metal halide perovskite, the general structure is ABX 3 , Where B is a divalent cation (Ge 2+ , Sn 2+ , Pb 2+ ), X is a halogen atom (F - , Cl - , Br - Or I - ), A is a monovalent cation (K + , Cs + , CH 3 NH 3 + ). As the absorption layer of solar cells, perovskite materials have a photoelectric conversion efficiency comparable to high-performance indium gallium selenium and commercial monocrystalline silicon solar cells. At the same time, its preparation requires abundant raw materials, low cost, high carrier mobility, large light absorption coefficient, and has significant performance and cost advantages. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G21/00H01L31/0216H01L31/18
CPCC01G21/006C01P2002/72C01P2002/84C01P2004/03C01P2004/62H01L31/0216H01L31/18Y02P70/50
Inventor 钟建林宇陈辉邵双双朱云柯雷疏影
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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