Double-perovskite single crystal, preparation method and application thereof, and double-perovskite single crystal photoelectric detector

A photodetector, double perovskite technology, applied in single crystal growth, single crystal growth, chemical instruments and methods, etc., can solve the problems of limited application, small single crystal particle size, etc., to improve overall performance and low cost , excellent photoluminescence performance and environmental stability

Active Publication Date: 2021-12-31
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, existing Cs 2 AgBiCl 6 Double perovskite materials are all nanocrystals, and their single crystal grain size is small, which limits their application in optoelectronic devices

Method used

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  • Double-perovskite single crystal, preparation method and application thereof, and double-perovskite single crystal photoelectric detector
  • Double-perovskite single crystal, preparation method and application thereof, and double-perovskite single crystal photoelectric detector
  • Double-perovskite single crystal, preparation method and application thereof, and double-perovskite single crystal photoelectric detector

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preparation example Construction

[0031] The present invention provides a method for preparing a double perovskite single crystal described in the above technical solution, comprising the following steps:

[0032] CsCl, AgCl, BiCl 3 , ErCl 3 Mix it with hydrochloric acid, carry out a compound reaction, and crystallize after cooling down to obtain a double perovskite single crystal.

[0033] In the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.

[0034] In the present invention, the CsCl, AgCl, BiCl 3 and ErCl 3 The molar ratio of is 2:1:(1-x):x, wherein, the range of x is the same as that of the aforementioned x, and will not be repeated here.

[0035] In the present invention, the concentration of the hydrochloric acid is preferably 8-12 mol / L, more preferably 10-12 mol / L. In the present invention, the ratio of the amount of CsCl to the volume of hydrochloric acid is preferably 1 mmol: 5-15 mL, more pr...

Embodiment 1

[0044] At room temperature, add 15mL of hydrochloric acid with a concentration of 12mol / L into a 50mL beaker, and then add 0.5mmol BiCl 3 , 0.5mmol ErCl 3 , 1mmolAgCl and 2mmol CsCl, seal the beaker with plastic wrap and place it in an ultrasonic machine for 20min until the raw materials are dissolved, transfer the solution in the beaker to a 50mL polytetrafluoroethylene reactor, place the reactor in an oven, The heating rate of ℃ / 6h was raised to 160°C, and the compound reaction was kept for 48h, and then the temperature was lowered to room temperature at a cooling rate of 1.5°C / h to carry out cooling crystallization. The reactor was taken out from the oven, the supernatant was removed, and the obtained crystal was used Wash with absolute ethanol until the washing liquid is colorless and transparent, dry at 60°C for 3 h under vacuum conditions, and obtain Erbium-doped double perovskite single crystal (Cs 2 AgEr 0.23 Bi 0.77 Cl 6 , the length of one side is 3mm, and the ma...

Embodiment 2

[0046] Prepare erbium-doped double perovskite single crystal according to the method of Example 1, the difference from Example 1 is only adding 0.75mmol BiCl 3 , 0.25mmol ErCl 3 , to obtain Erbium-doped double perovskite single crystal (Cs 2 AgEr 0.15 Bi 0.85 Cl 6 , the unilateral length is 2.5mm, and the maximum opposite side is 5mm).

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Abstract

The invention provides a double perovskite single crystal, a preparation method and application thereof, and a double perovskite single crystal photoelectric detector, and relates to the technical field of single crystal materials. The particle size of the Cs2AgErxBi(1-x)Cl6 (x is 0-0.9) double perovskite single crystal provided by the invention is greater than or equal to 1mm. Compared with a nano-scale single crystal, the double-perovskite single crystal provided by the invention has lower defects, higher carrier lifetime and mobility, excellent photoluminescence performance and environmental stability, and can improve the overall performance of a photoelectric device when being applied to the photoelectric device; and the photoelectric characteristics of the material can be explored. Furthermore, the erbium-doped double perovskite single crystal obviously improves the light response rate and the detection rate of photoelectric detection. Moreover, the traditional double-perovskite nano single crystal needs to be prepared into a thin film and then applied to a photoelectric device, while the double-perovskite single crystal provided by the invention can be directly applied to the photoelectric device, the film does not need to be prepared firstly, the application is simple, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of single crystal materials, in particular to a double perovskite single crystal, a preparation method and application thereof, and a double perovskite single crystal photoelectric detector. Background technique [0002] Lead halide perovskite (APbX 3 , where A=CH(NH 2 ) 2 + 、CH 3 NH 3 + or Cs + ;X=Cl - , Br - , I - ) have been identified as extremely promising candidates for photovoltaic and optoelectronic applications due to their properties of high charge carrier mobility, balanced electron-hole transport, high absorption coefficient, tunable bandgap, and long carrier diffusion length. Efficient materials in the foreground. However, the long-term exposure of lead halide perovskite to light, humidity or high temperature is unstable, which greatly shortens the service life of the device; moreover, the inherent toxicity of lead and its bioaccumulation in the ecosystem limit the development of lead...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/12C30B7/14C30B7/08H01L31/102H01L31/0224
CPCC30B29/12C30B7/14C30B7/08H01L31/102H01L31/022408
Inventor 高云汪慧胡辉凯文·彼得·霍姆伍德李荣
Owner HUBEI UNIV
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