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A dimensionally adjustable lead-free perovskite single crystal and its preparation method and application

A lead-calcium, dimensional technology, applied in the field of lead-free perovskite single crystal and its preparation, can solve problems such as environmental health restrictions on wide application, and achieve improved environmental stability and photovoltaic characteristics, reduced negative migration, and good thermal stability Effect

Active Publication Date: 2021-06-01
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although Pb-based halide perovskite has excellent photoelectric properties, the environmental health problems caused by the water solubility and toxicity of Pb greatly limit its wide application in society. 2+ And at the same time, ions with excellent photophysical properties and a hydrophobic macromolecular group that can replace the A-site cation are the key to solving the above problems.

Method used

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  • A dimensionally adjustable lead-free perovskite single crystal and its preparation method and application
  • A dimensionally adjustable lead-free perovskite single crystal and its preparation method and application
  • A dimensionally adjustable lead-free perovskite single crystal and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Ni(3py) at the A site replaced by transition metal complexes 2 BiBr 6 Preparation of lead-free perovskite single crystal;

[0041] 1) The solute nickel acetylacetonate, terpyridine, BiBr 3 Prepare according to the molar mass ratio of 1:2:1, that is, weigh 0.1mmol (0.0128g) nickel acetylacetonate, 0.2mmol (0.0234g) terpyridine, 0.1mmol (0.0225g) BiBr 3 It was dissolved in a mixed solution of 1 mL of commercially available hydrobromic acid with a concentration of 45%, 0.5 mL of deionized water, and 1.5 mL of anhydrous acetonitrile to obtain a precursor solution.

[0042] 2) Place the prepared precursor solution on a heating platform at 140°C and heat it to observe whether the solute is fully dissolved. If it is not completely dissolved, you can shake it properly to promote its dissolution; prolong the heating time to promote its dissolution, or add hydrobromic acid solvent to promote it. It dissolves. The completely dissolved solution is a clear transparent liquid.

...

Embodiment 2

[0051] Ni(3py) at the A site replaced by transition metal complexes 2 InCl 6 Preparation of lead-free perovskite single crystal;

[0052] In step 1), the solute nickel acetylacetonate, terpyridine, InCl 3 Prepare according to the ratio of molar mass ratio of 1:2:1, that is, weigh 0.1mmol (0.0128g) nickel acetylacetonate, 0.2mmol (0.0234g) terpyridine, 0.2mmol (0.0221g) InCl 3 , Dissolved in a mixed solution of 1 mL of 45% commercially available hydrochloric acid, 0.5 mL of deionized water and 1.5 mL of anhydrous acetonitrile. All the other steps are the same as in Example 1.

[0053] Figure 4 For Ni(3py) in embodiment 2 2 InCl 6 Response speed test results of UV photodetectors. The rise time is 0.67ms, and the fall time is 1.04ms, showing a fast response to ultraviolet light.

[0054] Figure 9 For Ni(3py) in embodiment 2 2 InCl 6 The variation curve of current with voltage of ultraviolet photodetector in dark state and light environment, the on-off ratio at 1V is ...

Embodiment 3

[0057] Transition metal complexes replace Cr(3py) at the A site 2 GaBr 6 Preparation of lead-free perovskite single crystal;

[0058] In step 1), the solute chromium triacetate, terpyridine, GaBr 3 Configure according to the ratio of molar mass ratio of 1:2:1, that is, weigh 0.1mmol (0.0229g) chromium triacetate, 0.2mmol (0.0234g) terpyridine, 0.1mmol (0.0309g) GaBr 3 , dissolved in a mixed solution of 1 mL of 45% commercially available hydrobromic acid, 0.5 mL of deionized water, and 1.5 mL of anhydrous acetonitrile. All the other steps are the same as in Example 1.

[0059] Figure 5 For Cr (3py) in embodiment 3 2 GaBr 6 Response speed test results of UV photodetectors. The rise time is 0.53ms, and the fall time is 0.87ms, showing a fast response to ultraviolet light.

[0060] Figure 10 For Cr (3py) in embodiment 3 2 GaBr 6 The variation curve of current with voltage of ultraviolet photodetector in dark state and light environment, the on-off ratio at 1V is 3.75×...

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Abstract

The invention discloses a dimensionally adjustable non-lead perovskite single crystal and its preparation method and application. The dimensionally adjustable non-lead perovskite single crystal has a structural formula of A III (3py) 2 B III x 6 , where A III for Ni 3+ 、Co 3+ 、Cr 3+ , B III for Bi 3+ 、In 3+ , Ga 3+ , Sb 3+ , X is Cl ‑ 、Br ‑ , I ‑ . its passed in ABX 3 It is prepared by replacing the A-site metal cation with a transition metal complex and adding a halide metal salt in the solution for growing a single crystal of type perovskite. The low-dimensional morphology of this type of dimensionally adjustable lead-free perovskite material can effectively improve the internal structure of the single crystal to form a host-guest system. The organic group will effectively protect the metal halide embedded in it and improve the stability of the single crystal. properties, and make the material exhibit the inherent characteristics of individual metal halides.

Description

technical field [0001] The invention belongs to the technical field of semiconductor photoelectric detection, and in particular relates to a dimension-adjustable non-lead perovskite single crystal and its preparation method and application. Background technique [0002] Since 2009, organic-inorganic hybrid perovskite materials APbX 3 [A=(CH 3 NH 3 ) + (MA + ), CH(NH 2 ) 2+ (FA+), Cs + ;X=I - 、Br - , Cl - ], which have attracted much attention due to their simple preparation method and excellent optoelectronic properties (tunable band gap, high mobility, high extinction coefficient), and the excellent structural tunability makes these materials have three (3D) , two (2D), one (1D) and zero-dimensional (0D) structures. Dimensional adjustment can effectively change the stability and photophysical properties of perovskite single crystals. Therefore, lead-free perovskite materials with low-dimensional morphology (2D, 1D, 0D) have attracted the attention of researchers,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B9/08C30B29/54C23C14/24C23C14/20H01L31/032H01L31/18
CPCC23C14/20C23C14/24C30B9/08C30B29/54H01L31/0321H01L31/18Y02P70/50
Inventor 范建东李闻哲张阳奕
Owner JINAN UNIVERSITY
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