Method for growing large-size perovskite single crystals
A perovskite, large-size technology, applied in the direction of single crystal growth, crystal growth, single crystal growth, etc., can solve the problems of complex process, expensive equipment, and reduce the solubility of perovskite, so as to achieve simple growth process and large size , high quality effect
Pending Publication Date: 2021-06-18
GUANGXI UNIV
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Problems solved by technology
The anti-solvent method requires the use of highly toxic solutions such as chlorobenzene as an anti-solvent to reduce the solubility of perovskite, which is not suitable for large-scale applications
However, the Bridgman method has a complicated process and expensive equipment, which hinders the application of perovskite single crystal optoelectronic devices.
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[0031] In order to make those skilled in the art understand the core idea of the present invention more clearly, it will be described in detail below with reference to the accompanying drawings.
[0032] Such as figure 1 As shown, the embodiment of the present invention provides a method for growing a large-sized perovskite single crystal using the inverse solubility characteristics of a saturated perovskite solution, which specifically includes the following steps:
[0033] S101. Prepare a perovskite supersaturated solution.
[0034] The specific implementation method can be: the excess equal proportion of CH 3 NH 3 X(X=Cl,Br,I) powder and PbX 2 The powder is dissolved in an organic solvent with a purity greater than 99.8%, placed on a heating platform and stirred at a temperature T to form a perovskite supersaturated solution.
[0035] In a preferred embodiment, the temperature T is 60-70°C.
[0036] In a preferred embodiment, the organic solvent with a purity greater...
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Abstract
The invention belongs to the technical field of perovskite photoelectric materials, and provides a method for growing large-size perovskite single crystals. The method comprises the following steps: preparing a perovskite supersaturated solution; filtering the perovskite supersaturated solution, heating the filtered perovskite supersaturated solution to the maximum threshold temperature at a preset heating speed, and separating out perovskite single crystals; and taking the separated perovskite single crystal particles as seed crystals, culturing the seed crystals in a re-prepared perovskite supersaturated solution, and growing to obtain the large-size perovskite single crystals. According to the method, the large-size perovskite single crystals grow by utilizing the inverse solubility characteristic of the perovskite saturated solution, complicated growth equipment is not needed, the growth process is simple, the equipment cost is low, the perovskite single crystal obtained by growth is large in size and high in quality, and large-scale application of perovskite single crystal photoelectric devices is facilitated.
Description
technical field [0001] The invention relates to the technical field of perovskite photoelectric materials, in particular to a method for growing large-scale perovskite single crystals. Background technique [0002] In recent years, emerging perovskite optoelectronic materials have attracted great attention from researchers due to their advantages such as high light absorption coefficient, low exciton binding energy and long carrier diffusion distance. Since the preparation process is very similar to traditional organic / polymer optoelectronic devices, perovskite optoelectronic devices are widely used in consumer electronics, household appliances, smart building lighting, industry, production safety, health care and life sciences, environment, toys and education. The field has broad application prospects. Organic-inorganic hybrid perovskites have very narrow band gaps and become star materials for solar cells and photodetectors. Compared with polycrystalline perovskite singl...
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IPC IPC(8): C30B29/54C30B7/14
CPCC30B29/54C30B7/14
Inventor 孙文红王玉坤李磊
Owner GUANGXI UNIV