A kind of double metal perovskite nano material and preparation method thereof

A nanomaterial, perovskite technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as unsuitability, instability, and unstable power output of photovoltaic devices, to avoid Potential pollution, high stability, and the effect of improving photoelectric conversion efficiency

Active Publication Date: 2021-10-12
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

MAPbI 3 With a wide absorption range and direct bandgap, it can be used as a light absorber in perovskite solar cells, and high power conversion efficiency can be achieved by optimizing the cell structure, but the MAPbI 3 The key problems in the large-scale commercial application of photovoltaic devices are: 1) the material is unstable and prone to decomposition under high humidity, long-term light and heat conditions; 2) metal ions and lead ions are toxic; 3) the power output of photovoltaic devices is not Stablize
But research has found that most of the above elements have the following problems: 1) the energy band gap is too high; 2) there is toxicity or radioactivity (Ge of the present invention Ⅱ -Sb Ⅲ non-toxic and abundant in soil); 3) instability in the +2 valence state, etc., resulting in their limited ability to form perovskites or not suitable for photovoltaics
However, most of the currently synthesized bimetallic perovskite materials have indirect band gaps or their direct band gaps are not suitable for photovoltaic applications, so they are limited.

Method used

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  • A kind of double metal perovskite nano material and preparation method thereof
  • A kind of double metal perovskite nano material and preparation method thereof
  • A kind of double metal perovskite nano material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of bimetallic perovskite nanomaterials FA4 Ge Ⅱ Sb Ⅲ Cl 12 ,Specific steps are as follows:

[0030] 1) 2.5mmol antimony trioxide (Sb 2 o 3 ) and 1.5mmol germanium dichloride (GeCl 2 ) was added to 5.0mL hydrochloric acid solution (2mol / L) to prepare a mixed solution;

[0031] 2) At room temperature, add 0.5mmol formamidine chloride (HC(NH 2 ) 2 Cl) was added to the mixed solution obtained in step 1), stirred at room temperature for 1 h to obtain a precipitate, then filtered with a glass sand core, and the obtained filter residue was dried under reduced pressure (dried after vacuuming, the temperature was set at 100 ° C, and the drying time was 1.5 h , the pressure is set to 2.67kPa) to obtain the double metal perovskite compound FA 4 Ge Ⅱ Sb Ⅲ Cl 12 powder sample.

[0032] Measure the XRD figure (see figure 1 ), indicating that it has the same FA 4 Ge Ⅱ Sb Ⅲ Cl 12 corresponding crystal structure.

[0033] Measure the SEM figure of the powde...

Embodiment 2

[0038] The sample powder prepared in Example 1 was placed in an environment with a relative humidity of 60% for 1 month, and then XRD performance characterization was performed.

Embodiment 3

[0040] The sample powder prepared in Example 1 was placed in an environment with a relative humidity of 60% for 3 months, and then XRD performance characterization was performed.

[0041] Measure the XRD pattern of the powder sample of embodiment 1-3 by X-ray powder diffractometer (model D8Advance) (see Image 6 ), where (a) is FA 4 Ge Ⅱ Sb Ⅲ Cl 12 Standard card, (b), (c) and (d) are the XRD collection of illustrative plates of powder sample in embodiment 1, embodiment 2 and embodiment 3 respectively, it can be seen that three kinds of powder samples all have and FA 4 Ge Ⅱ Sb Ⅲ Cl 12 The corresponding crystal structure shows that the phosphor has not decomposed and has strong moisture resistance.

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Abstract

The invention relates to a double metal perovskite nano material and a preparation method thereof. The double metal perovskite nano material is a perovskite structure nano material with a particle diameter of 10-20 nm, and its expression is FA 4 Ge Ⅱ Sb Ⅲ Cl 12 , where FA is NH 2 CH=NH 2 + . The preparation method is as follows: 1) adding antimony trioxide and germanium dichloride to hydrochloric acid solution to prepare a mixed solution; 2) adding formamidine chloride to the mixed solution obtained in step 1) at normal temperature, and stirring for 0.5- After 1 hour, a precipitate was obtained, and then filtered with a glass sand core, and the filter residue was dried under reduced pressure to obtain a powder sample of a bimetallic perovskite compound. The double-metal perovskite material provided by the present invention exhibits relatively high stability under conditions of high humidity, long-term light and heat, overcomes the shortcomings of currently commonly used perovskite materials; and has a lower direct band gap , which is conducive to the generation of electronic transitions, thereby improving the photoelectric conversion efficiency.

Description

technical field [0001] The invention belongs to the technical field of perovskite solar cells, in particular to a double metal perovskite compound FA 4 Ge Ⅱ Sb Ⅲ Cl 12 Nanomaterials and their preparation methods. Background technique [0002] Due to many advantages such as high extinction coefficient, low defect state concentration and long carrier lifetime, MAPbI has been used in recent years 3 (MA=CH 3 NH 3 + ) represented organic-inorganic hybrid halide perovskite materials with high power conversion efficiency (general formula AMX 3 , A=organic molecule, M=divalent metal ion, X=halide) in solar cells has attracted widespread attention. MAPbI 3 With a wide absorption range and direct bandgap, it can be used as a light absorber in perovskite solar cells, and high power conversion efficiency can be achieved by optimizing the cell structure, but the MAPbI 3 The key problems in the large-scale commercial application of photovoltaic devices are: 1) the material is un...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C257/12H01L51/42H01L51/46H01L51/48B82Y30/00
CPCY02E10/549
Inventor 戴武斌周佳许硕胡金黄珂徐慢
Owner WUHAN INSTITUTE OF TECHNOLOGY
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