Lead-free perovskite Cs2AgBiBr6, preparation method and method for obtaining diffusion coefficient of lead-free perovskite Cs2AgBiBr6

A lead-free perovskite, diffusion coefficient technology, applied in diffusion analysis, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of many defect states, complex internal structure, no direct evidence to observe the diffusion process, etc., and achieve morphology rules. , the effect of less surface defects

Inactive Publication Date: 2020-06-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

However, scholars have studied the lead-free perovskite Cs 2 AgBr 6 The kinetic studies of the lead-free perovskite Cs are less 2 AgBr 6 The internal structure is more complicated, and there are more defect states, and there is no direct evidence to observe its diffusion process

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  • Lead-free perovskite Cs2AgBiBr6, preparation method and method for obtaining diffusion coefficient of lead-free perovskite Cs2AgBiBr6
  • Lead-free perovskite Cs2AgBiBr6, preparation method and method for obtaining diffusion coefficient of lead-free perovskite Cs2AgBiBr6
  • Lead-free perovskite Cs2AgBiBr6, preparation method and method for obtaining diffusion coefficient of lead-free perovskite Cs2AgBiBr6

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Embodiment 1

[0042] A lead-free perovskite Cs 2 AgBr 6 The preparation method of and the method for obtaining its diffusion coefficient specifically include the following steps:

[0043] (1) Accurately weigh 426mg of CsBr, BiBr 3 Dissolve 448mg in 16ml of HBr, stir and heat until dissolved at 130°C, add 188mg of AgBr and continue to stir until dissolved, keep it warm for two hours, then cool down to room temperature at a rate of 5°C / h, overnight, wash the sample with isopropanol solution until clear , and dry the sample at 60°C.

[0044] (2) Measure Cs at 1.9, 1.45, 1.132, 0.832, 0.654, 0.432, 0.348uw energies respectively 2 AgBr 6 life.

[0045] (3) Use 100X objective lens, 0.619uw energy, and conduct Cs at 298, 243, 213, 183, 153, 143, 133, 123K temperature 2 AgBr 6 fluorescence imaging. Taking the fluorescence intensity of the fluorescence spot at time 0 as the reference, normalize the light spots at other times.

[0046] (4) Extracting Cs at different times 2 AgBr 6 The X-a...

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Abstract

The invention discloses lead-free perovskite Cs2AgBiBr6, a preparation method of the lead-free perovskite Cs2AgBiBr6 and a method for obtaining a diffusion coefficient of the lead-free perovskite Cs2AgBiBr6, and belongs to the field of material luminescence. And the lead-free perovskite Cs2AgBiBr6 is synthesized by adopting a crystallization method. Fluorescence imaging light spots of the lead-free perovskite Cs2AgBiBr6 are collected under low energy, the light spots at different moments are extracted, then normalization is carried out with the light spot intensity at the zero moment as the benchmark, and it can be clearly seen that the diameter of the light spots is increased, so that the light spots are more uniform. According to direct evidence, the diffusion process of the lead-free perovskite Cs2AgBiBr6 is observed. The diffusion coefficient D of the Cs2AgBiBr6 is obtained through Gaussian fitting of the fluorescence intensity, and the mobility of the Cs2AgBiBr6 is obtained through conversion. Through fitting of diffusion coefficients D at different temperatures, it is obtained that carrier scattering of the Cs2AgBiBr6 is in an optical wave scattering mode, and guiding significance is provided for research and development of lead-free perovskite.

Description

technical field [0001] The invention belongs to the field of luminescent materials, in particular to a lead-free perovskite Cs 2 AgBr 6 Methods of preparation and methods of obtaining their diffusion coefficients. Background technique [0002] In recent years, leaded perovskite ABX 3 [A=CH 3 NH 3+ ,(H 2 N) 2 CH + ;B=Pb 2+ ;X=Cl - ,Br - or I - ], semiconductor materials turned out, this type of semiconductor materials have brought too many surprises to scholars. At present, the photoelectric conversion efficiency of lead-containing perovskite solar cells has increased from 3.8% at the beginning to 22% now, and has applications in light-emitting diodes, lasers, photodetectors, and photocatalysis. In the past few years, lead-containing perovskite solar cells have been favored by scholars and developed in a blowout style, becoming a research hotspot in the field of photovoltaics, and were selected by authoritative magazines in the scientific community in 2013 It was...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G29/00C09K11/74G01N21/64G01N13/00
CPCC01G29/006C01P2002/34C01P2006/60C09K11/7435G01N13/00G01N21/6456G01N2013/003
Inventor 金盛烨尹延峰边继明
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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