Temperature inversion solution growth method of all-inorganic perovskite single crystals

A solution growth, inorganic calcium technology, applied in the direction of single crystal growth, single crystal growth, crystal growth, etc., can solve problems such as poor practicability, and achieve the effect of good crystal quality

Active Publication Date: 2018-03-23
NANJING GONGCHENG RES INST OF ENERGY CONSERVATION & NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to overcome the shortcomings of poor practicability of the existing all-inorganic perovskite single crystal growth method, the present invention provides an inversion temperature solution growth method for all-inorganic perovskite single crystal

Method used

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  • Temperature inversion solution growth method of all-inorganic perovskite single crystals
  • Temperature inversion solution growth method of all-inorganic perovskite single crystals
  • Temperature inversion solution growth method of all-inorganic perovskite single crystals

Examples

Experimental program
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Effect test

Embodiment 1

[0021] In the first step, 0.05 mol of cesium bromide with a concentration of 99.99% and 0.1 mol of lead bromide with a concentration of 99.99% are added to 100 mL of organic solvent dimethyl sulfoxide, and stirred at room temperature for 1 hour, until the solid is completely dissolved A clear solution was obtained.

[0022] In the second step, filter the above-obtained clear solution with a filter syringe, add the inverse solubility mixture, and stir well to obtain a precursor solution. The reverse solubility mixture is prepared by mixing cyclohexanol and dimethylformamide in a volume ratio of 1:1.8. The volume of the inverse solubility mixture added was 100 mL.

[0023] In the third step, place the precursor solution in a flat-bottomed flask with a clean bottom and seal it. Fix the flask on the fixing clamp and adjust the height so that it is completely immersed in the heating water tank. After keeping it in a water bath at 50°C for 10 hours, fine crystals precipitated on the b...

Embodiment 2

[0026] In the first step, 0.06 mol of cesium bromide with a concentration of 99.99% and 0.12 mol of lead bromide with a concentration of 99.99% are added to 120 mL of organic solvent dimethyl sulfoxide, and stirred at room temperature for 2 hours, until the solid is completely dissolved A clear solution was obtained.

[0027] In the second step, filter the above-obtained clear solution with a filter syringe, add the inverse solubility mixture, and stir well to obtain a precursor solution. The inverse solubility mixture is prepared by mixing cyclohexanol and dimethylformamide in a volume ratio of 1:1.7. The volume of the added reverse solubility mixture was 120 mL.

[0028] In the third step, place the precursor solution in a flat-bottomed flask with a clean bottom and seal it. Fix the flask on the fixing clamp and adjust the height so that it is completely immersed in the heating water tank. After being kept in a water bath at 49.5°C for 11 hours, a few fine crystals precipitate...

Embodiment 3

[0031] In the first step, 0.08 mol of cesium bromide with a concentration of 99.99% and 0.16 mol of lead bromide with a concentration of 99.99% are added to 160 mL of organic solvent dimethyl sulfoxide, and stirred at room temperature for 3 hours, until the solid is completely dissolved A clear solution was obtained.

[0032] In the second step, filter the above-obtained clear solution with a filter syringe, add the inverse solubility mixture, and stir well to obtain a precursor solution. The inverse solubility mixture is prepared by mixing cyclohexanol and dimethylformamide in a volume ratio of 1:1.5. The volume of the added reverse solubility mixture was 160 mL.

[0033] In the third step, place the precursor solution in a flat-bottomed flask with a clean bottom and seal it. Fix the flask on the fixing clamp and adjust the height so that it is completely immersed in the heating water tank. After keeping it in a water bath at 49°C for 12 hours, a few fine crystals precipitated ...

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Abstract

The invention discloses a temperature inversion solution growth method of all-inorganic perovskite single crystals, and aims to solve the technical problem of low practicability of the existing growthmethod of the all-inorganic perovskite single crystals. According to the technical scheme, the temperature inversion solution growth method of the all-inorganic perovskite single crystals comprises the following steps: firstly mixing cesium bromide and lead bromide which are used as raw materials, dissolving and stirring the materials in an organic solvent which is dimethyl sulfoxide, filtering,then adding a mixed solution with cyclohexanol and dimethyl formamide to obtain a precursor solution; secondly keeping the temperature of the precursor solution for a certain time under a certain temperature, and filtering the solution after separating crystals out; and finally putting filtrate in a water tank, heating and increasing the temperature to grow large-sized and high-crystallization-quality CsPbBr3 crystals. According to the method, an XRD spectrum of CsPbBr3 powder prepared by the method is consistent with an XRD spectrum of a standard structure card, thus proving that the CsPbBr3powder is a pure phase; CsPbBr3 single crystals which are 4-7mm in length, 3-5mm in width and 2-3mm in height are obtained; the method is high in practicability.

Description

Technical field [0001] The invention relates to a growth method of an all-inorganic perovskite single crystal, in particular to an inversion solution growth method of an all-inorganic perovskite single crystal. Background technique [0002] All inorganic halide material CsPbBr 3 It belongs to the perovskite crystal structure and has the characteristics of direct band gap, wide range of light absorption, high luminous intensity, and large carrier mobility lifetime product (μτ). At the same time, compared with organic-inorganic hybrid perovskite crystal materials, all-inorganic perovskite has higher chemical stability, time stability and thermal stability. All inorganic halide perovskite material CsPbBr 3 It has extremely high potential application value in light-emitting diodes, radiation detectors, solar cells and other fields, and is currently a research hotspot in countries around the world. However, the preparation of large size, high crystalline quality all-inorganic halide ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/12C30B7/14
CPCC30B7/14C30B29/12
Inventor 徐亚东张滨滨张洪健卢宇飞刘欣周策介万奇
Owner NANJING GONGCHENG RES INST OF ENERGY CONSERVATION & NEW MATERIALS TECH CO LTD
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