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Size regulation and control method of formamidine lead iodide perovskite nanocrystals

A lead iodide and nanocrystal technology, which is applied in the field of new optoelectronic material preparation, can solve the problem that nanocrystal regulation is difficult to effectively control and so on.

Active Publication Date: 2022-01-11
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the above-mentioned shortcoming of the prior art, the object of the present invention is to provide a kind of continuous control method of formamidine lead iodide perovskite nanocrystal size, to solve the problem of synthesizing formamidine lead iodide perovskite nanocrystal in the prior art It is difficult to effectively control the size of nanocrystals in a wide range when it is difficult to effectively control the technical problem

Method used

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  • Size regulation and control method of formamidine lead iodide perovskite nanocrystals

Examples

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Embodiment 1

[0037] A method for regulating the size of formamidine lead iodide perovskite nanocrystals, the specific steps are as follows:

[0038] S1: 0.521 g (5 mmol) of formamidine acetate (FAAc, 99%) and 10 mL of oleic acid (OA, 90%) were mixed in a three-necked flask, and degassed at room temperature for 30 minutes. Raise the temperature to 120°C under a nitrogen atmosphere. After the formamidine acetate is completely dissolved, cool to room temperature to obtain a formamidine-oleic acid solution. At this time, the concentration of formamidine acetate in oleic acid is 0.0521g / mL ;

[0039] S2: 0.344g (0.74mmol) lead iodide (PbI 2 ) powder and 20 mL of 1-octadecene (1-ODE, 90%) were mixed to form a mixture, which was degassed at 130° C. for about 60 minutes. Inject a mixed solution of 4 mL oleic acid (OA, 90%) and 2 mL oleylamine (OAm, 70%) under vacuum until the lead iodide powder is completely dissolved, cool to room temperature and store under a nitrogen atmosphere to obtain a le...

Embodiment 2

[0043] Different from Example 1, the concentration of formamidine acetate in oleic acid in S1 is 0.0782g / mL, and the molar ratio of formamidine ion to lead ion in S3 is 5.07 (FA:Pb=5.07), and the remaining steps and parameters are the same as in Example 1 to obtain formamidine lead iodide perovskite nanocrystals.

Embodiment 3

[0045] Different from Example 1, the concentration of formamidine acetate in oleic acid in S1 is 0.1042g / mL, and the molar ratio of formamidine ion to lead ion in S3 is 6.76 (FA:Pb=6.76), and the remaining steps and parameters are the same as in Example 1 to obtain formamidine lead iodide perovskite nanocrystals.

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Abstract

The invention mainly relates to a method for regulating and controlling the size of formamidine lead iodide perovskite nanocrystals, and belongs to the technical field of preparation of novel photoelectric materials. The invention is used for solving the technical problem that in the prior art, when the formamidine lead iodide perovskite nanocrystals are synthesized, the regulation and control of the size of the nanocrystals in a wide range are difficult to effectively control. According to the invention, the size of the formamidine lead iodide perovskite nanocrystal can be continuously regulated and controlled in a range of 10-200nm, and the photoresponse characteristic of the nanocrystal shows characteristics related to the size of the formamidine lead iodide perovskite nanocrystal. The implementation process of the method mainly comprises the following three steps: preparing a formamidine-oleic acid solution; preparing a lead iodide solution; and carrying out a thermal injection reaction to form a product, and carrying out centrifugal purification to obtain the formamidine lead iodide perovskite nanocrystal which is stable at room temperature.

Description

technical field [0001] The invention belongs to the technical field of preparation of novel photoelectric materials, and in particular relates to a method for regulating the size of formamidine lead iodide perovskite nanocrystals. Background technique [0002] Metal iodide perovskites have the advantages of low exciton binding energy, long carrier lifetime and diffusion distance, broad spectral absorption and wide compositional tunability, etc., and have become the most research-focused class of optoelectronic materials. The field of photodetectors, light-emitting diodes and solar cells has good development prospects. Compared with perovskite bulk materials, perovskite nanocrystals (quantum dots) have the characteristics of tunable absorption spectrum (quantum size effect), high light absorption coefficient and high defect tolerance. In particular, for a formamidine lead iodide perovskite (FAPbI 3 ) nanocrystals, which have the advantages of narrow optical bandgap, long ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/66B82Y20/00B82Y30/00B82Y40/00
CPCC09K11/02C09K11/664B82Y20/00B82Y30/00B82Y40/00Y02E10/549
Inventor 宋霖王剑陈永华
Owner NORTHWESTERN POLYTECHNICAL UNIV
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