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Method for growing large-size perovskite single crystal by using ternary mixed solvent

A mixed solvent and perovskite technology, applied in the directions of single crystal growth, crystal growth, single crystal growth, etc., can solve problems such as difficulty in single crystal growth, and achieve the effects of controllable growth method, expansion of light absorption range, and simple method.

Inactive Publication Date: 2020-06-16
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, CsPbI x Br 3-x The growth of single crystal is still facing difficulties, such as the need for strong acid environment, high temperature conditions, etc.

Method used

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  • Method for growing large-size perovskite single crystal by using ternary mixed solvent
  • Method for growing large-size perovskite single crystal by using ternary mixed solvent
  • Method for growing large-size perovskite single crystal by using ternary mixed solvent

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Embodiment 1

[0044] Lead bromide (PbBr 2 ) and cesium bromide (CsBr) were mixed and dissolved in DMSO at a molar ratio of 1:1 to obtain a mixed solution with a concentration of 0.4 mol / L. After the solution was fully stirred evenly at 40°C, two solvents, DMF and GBL, were added dropwise. The volume ratio of the three solvents was DMSO:DMF:GBL=5:1:1, and the precursor solution dissolved in the ternary mixed solvent was obtained. . After the solution was sealed, it was transferred to a crystal growth tank, and the temperature was raised to 90° C. to start crystal growth. Through spontaneous crystallization, large-sized CsPbBr is finally obtained 3 Perovskite single crystal, the single crystal size is about 2mm, the ultraviolet absorption edge is located at 560nm, and the optical band gap is 2.3eV.

[0045] figure 1 Obtaining CsPbBr for Example 1 3 Physical photos of single crystals;

[0046] image 3 A is the CsPbBr that utilizes X-ray diffraction to obtain in embodiment 1 3 XRD for ...

Embodiment 2

[0050] Lead bromide (PbBr 2 ), cesium iodide (CsI) were mixed and dissolved in DMSO at a molar ratio of 1:1, so that the concentration of the mixed solution was 0.4mol / L. After the solution was fully stirred evenly at 40°C, two solvents, DMF and GBL, were added dropwise. The volume ratio of the three solvents was DMSO:DMF:GBL=5:1:1, and the precursor solution dissolved in the ternary mixed solvent was obtained. . After the solution was sealed, it was transferred to a crystal growth tank, and the temperature was raised to 90° C. to start crystal growth. According to the principle of inverse solubility, crystals nucleate and grow spontaneously, and finally obtain large-sized CsPbI x Br 3-x Perovskite single crystal, the single crystal size is about 5mm, where Br:I is 1::1, the ultraviolet absorption edge is at 575nm, and the optical band gap is 2.1eV.

[0051] figure 2 Obtaining CsPbBr for Example 2 3 Physical photos of single crystals;

[0052] image 3 B is the CsPbI ...

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Abstract

The invention provides a method for growing a pure inorganic, large-size and iodine-containing CsPbIxBr3-x perovskite single crystal with a tunable optical band gap by using a ternary mixed solvent. According to the method, the inverse temperature solubility characteristic of CsPbIxBr3-x in a ternary solvent is utilized, and the large-size single crystal grows in a stable solution formed by the ternary solvent. The method comprises the steps: respectively mixing and dissolving lead bromide (PbBr2) and cesium iodide (CsI) in DMSO according to a molar ratio of 1:1, and continuously dropwise adding DMF and GBL solvents to obtain a precursor solution dissolved by the ternary mixed solvent; and sealing the solution and then gradually heating to 90 DEG C or below, and growing a large-size CsPbIxBr3-x perovskite single crystal according to the inverse solubility principle, wherein x is the doping content of I and is any numerical value selected from 0-3, and the absorption spectrum ranges from 560 nm to 700 nm.

Description

technical field [0001] The invention relates to the field of preparation of pure inorganic and mixed halogen perovskite materials and crystal growth, in particular to a method of growing large-sized iodine-containing CsPbI from a ternary mixed solvent x Br 3-x Methods for perovskite single crystals. Background technique [0002] First of all, the perovskite material is used as the technology of the light absorbing layer of solar cells, and the absorption of sunlight by the absorbing layer is an important factor in determining the photoelectric conversion efficiency. The absorption of sunlight by materials mainly utilizes its wide light absorption range, which can absorb light energy to a greater extent, improve the utilization rate of light, generate greater current density, and then improve the photoelectric conversion efficiency when it is used on photovoltaic devices . [0003] Secondly, perovskite materials can be divided into organic-inorganic hybrid perovskites and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B7/14C30B29/12
CPCC30B7/14C30B29/12
Inventor 丁建旭程晓华李正宵张杰姚青王开宇袁野
Owner SHANDONG UNIV OF SCI & TECH
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