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Preparation method of organic and inorganic hybrid perovskite single crystal

A perovskite and inorganic technology, applied in the field of preparation of organic-inorganic hybrid perovskite single crystals, can solve the problems of high equipment requirements and complex processes, and achieve the effect of good stability

Inactive Publication Date: 2016-03-16
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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Problems solved by technology

The top seed method can produce high-quality perovskite single crystals with larger sizes and fewer defects, but the process is more complicated and requires higher equipment

Method used

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  • Preparation method of organic and inorganic hybrid perovskite single crystal

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preparation example Construction

[0021] see figure 1 As shown, the present invention provides a method for preparing an organic-inorganic hybrid perovskite single crystal, comprising the following steps:

[0022] Step 1: Mix raw material A and raw material B according to a certain ratio and then dissolve in solvent C to form a precursor solution; during the dissolution process, ultrasound-assisted dissolution can be added;

[0023] Wherein raw material A is PbX 2 ; Raw material B is CH 3 NH 3 X or NH 2 CH=NH 2 X; the element X is a halogen element Cl, Br or I, and the raw material A and the raw material B are mixed according to a molar ratio of 1: (1-4);

[0024] Wherein the PbX in raw material A 2 Is a single species or PbCl 2 , PbBr 2 and PbI 2 Mixture; CH in raw material B 3 NH 3 X is a single one or CH 3 NH 3 Cl, CH 3 NH 3 Br, CH 3 NH 3 The mixing of I; the NH in the raw material B 2 CH=NH 2 X is a single type or NH 2 CH=NH 2 Cl, NH 2 CH=NH 2 Br, NH 2 CH=NH 2 Mixture of I, raw mat...

Embodiment 1

[0031] Accurately weigh 1.0313gPbBr 2 , 0.1888gCH 3 NH 3 PbBr and 0.0759gCH 3 NH 3 PbCl, the molar ratio of the three raw materials is PbBr 2 :CH 3 NH 3 PbBr:CH 3 NH 3 PbCl=5:3:2. The three raw materials are mixed and dissolved in 2ml DMF, and the dissolution can be accelerated by ultrasound. After fully dissolving, filter with a polytetrafluoroethylene filter with a pore size of 0.22 μm, and place it in a sealed glass bottle. Prepare the oil bath equipment and set the oil bath temperature to 50°C. Heat the sealed glass bottle containing the precursor solution in an oil bath. When crystals are precipitated, the temperature is increased by 1°C every 15 minutes, and the crystal grains grow gradually. The temperature of the oil bath is gradually increased to 90°C, and the temperature can be kept constant. After the grain growth rate slows down, take out the sealed glass bottle, take out the grain, and turn off the oil bath equipment. Perovskite single crystal growth...

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Abstract

The invention discloses a preparation method of an organic and inorganic hybrid perovskite single crystal. The method comprises the following steps: (1) mixing a raw material A with a raw material B, and dissolving the mixture into a solvent C to form a precursor solution; (2) filtering the prepared precursor solution with a polytetrafluoroethylene filter, enclosing the product into a container and sealing the container; (3) heating the sealed container accommodating the precursor solution to a target temperature; (4) keeping a predetermined time interval after the crystal is separated out from the precursor solution, gradually increasing the temperature, and enabling the crystal to gradually grow along with the gradual rise of the temperature; and (5) taking out the crystal from the sealed container after the crystal grows into a proper dimension and finishing preparation. The preparation method has the advantage that low-cost and rapid preparation of the organic and inorganic hybrid perovskite single crystal is achieved.

Description

technical field [0001] The invention relates to a method for preparing an organic-inorganic hybrid perovskite single crystal, which belongs to the technical field of semiconductor material manufacture and chemical synthesis. technical background [0002] An organic-inorganic hybrid material CH with a perovskite structure 3 NH 3 wxya 3 Initiated a revolution in the field of photovoltaics. Since 2009, the efficiency of perovskite solar cells with simple process and low cost has increased rapidly from 3.8% to 20.1%. [0003] Organic-inorganic hybrid perovskites have excellent optical and electrical properties. The most common perovskite material is lead methylamine iodide (CH 3 NH 3 PB 3 ), which is a direct bandgap semiconductor material with a bandgap of about 1.5eV. Its extinction coefficient is high, and a film with a thickness of about 400 nm can fully absorb sunlight below 800 nm. The exciton binding energy of photoexcitation is only 0.030eV, indicating that most...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/48H01L51/42
CPCH10K85/00H10K30/00Y02E10/549
Inventor 袁国栋王乐段瑞飞李晋闽王军喜黄芳吴瑞伟王克超
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI