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A kind of preparation method of perovskite single crystal

A perovskite precursor and single crystal technology, which is applied in the direction of single crystal growth, crystal growth, single crystal growth, etc., can solve the problems of small crystals and difficult control of perovskite single crystal growth

Active Publication Date: 2020-12-22
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present application provides a method for preparing perovskite single crystals, which can improve the existing technical problems that the growth of perovskite single crystals is difficult to control and the obtained crystals are smaller

Method used

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  • A kind of preparation method of perovskite single crystal
  • A kind of preparation method of perovskite single crystal
  • A kind of preparation method of perovskite single crystal

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preparation example Construction

[0047] The application provides a method for preparing a perovskite single crystal, which includes:

[0048] Mix the perovskite precursor and the solvent evenly to obtain a clear liquid, raise the temperature until black turbidity appears, record the temperature at which the black turbidity appears as the crystallization temperature, cool down until the black turbidity completely disappears, heat up to the crystallization temperature again and hold at the crystallization temperature for a preset time After solid-liquid separation, perovskite single crystals were obtained.

[0049] The rate of heating up to the appearance of black turbidity is 10 to 200 times the rate of heating up to the crystallization temperature again.

[0050] The perovskite precursor includes a first halide and a second halide.

[0051] The first halide is AX, where A includes CH 3 NH 3 + 、H 2 NCH=NH 2 + 、CH 3 CH 2 NH 3 + , (CH 3 ) 4 N + 、C 7 h 7 + , Rb + and Cs + Any one or more of X i...

Embodiment 1

[0081] The embodiment of the present application provides a method for preparing a perovskite single crystal.

[0082] 1. Dissolve

[0083] Take 0.00048mol of CH 3 NH 3 I, 0.0024mol of H 2 NCH=NH 2 I, 0.00012mol of CsI and 0.003mol of PbI 2 , into a 5ml glass bottle, add 2ml of γ-butyrolactone with a syringe, put a small stirring bar, cover the glass bottle, seal it with sealing glue, place it on a heating magnetic stirrer and heat it to 75°C and stir 2h;

[0084] 2. Find the crystallization temperature

[0085] Heat the heating magnetic stirrer at a heating rate of 4°C / min until black turbidity appears, and record the temperature at which black turbidity appears as 125°C;

[0086] 3. Preparation of perovskite single crystal

[0087] Cool down to 75°C to make the black turbidity disappear completely, filter the mixture, add the filtered mixture into a 10mL glass bottle, seal it with tin foil, put the glass bottle containing the mixture into the muffle furnace, and set ...

Embodiment 2

[0091] The embodiment of the present application provides a method for preparing a perovskite single crystal.

[0092] 1. Dissolve

[0093] Take 0.0016mol of CH 3 CH 2 NH 3 I, 0.0008mol of (CH 3 ) 4 NBr, 0.0008mol of C 7 h 7 Br and 0.0032mol of GeBr 2 , into a 5ml glass bottle, add 2ml of N,N-dimethylformamide with a syringe, put a small stirring bar, cover the glass bottle, seal it with sealing glue, place it on a heating magnetic stirrer and stir 2.5 hours;

[0094] 2. Find the crystallization temperature

[0095] Heat the heating magnetic stirrer at a heating rate of 6°C / min until black turbidity appears, and record the temperature at which black turbidity appears as 115°C;

[0096] 3. Preparation of perovskite single crystal

[0097] Cool down to 65°C to make the black turbidity disappear completely, filter the mixture, add the filtered mixture into a 10mL glass bottle, seal it with tin foil, put the glass bottle containing the mixture into the muffle furnace, a...

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Abstract

The invention discloses a preparation method of a perovskite single crystal, and belongs to the technical field of perovskite crystals. The preparation method of the perovskite single crystal comprises the following steps: uniformly mixing a perovskite precursor and a solvent to obtain clear liquid; heating until black turbid appears, recording the temperature at which the black turbid appears asa crystallization temperature, cooling until the black turbid completely disappears, heating to the crystallization temperature again for crystallization, carrying out heat preservation crystallization at the crystallization temperature, and carrying out solid-liquid separation to obtain the perovskite single crystal. According to the method, rapid temperature increasing is used to find the crystallization temperature of the perovskite single crystal, the temperature at which black turbidity occurs is the crystallization temperature, the perovskite single crystal obtained through crystallization at the crystallization temperature has a large crystal size, and the crystallization process is easy to control. Black turbidity in the heating process is fine perovskite crystal particles, the fine crystallized perovskite crystal particles can be dissolved by cooling, and after the solution is clarified again, the solution is heated to a crystallization temperature at a relatively slow rate toobtain a relatively large perovskite single crystal.

Description

technical field [0001] The present application relates to the technical field of perovskite crystals, in particular to a method for preparing a perovskite single crystal. Background technique [0002] Perovskite solar cells (PSCs) have attracted extensive attention due to their facile fabrication and increasing photoelectric conversion efficiency. Currently, the highest certified photoelectric conversion efficiency has reached 25.2%. The high light absorption and tunable cationic composition of perovskites make them promising for the application in PSCs. However, the stability of PSCs still hinders their rapid development and widespread use compared with commercial silicon-based solar cells (with a lifetime of more than 20 years). [0003] The performance of perovskite photovoltaic devices is threatened by light, heat, water and oxygen, and the main reason is the instability of the perovskite material itself. Most studies on PSCs are based on polycrystalline films with ho...

Claims

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Application Information

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IPC IPC(8): C30B7/14C30B29/54C30B29/12
CPCC30B7/14C30B29/12C30B29/54
Inventor 赵丽黄诣敏董兵海王世敏李文路李矜
Owner HUBEI UNIV