Preparing method for methylamine bromide lead crystals of large-size perovskite structure

A technology of perovskite structure and lead methylamine bromide, which is applied in crystal growth, chemical instruments and methods, single crystal growth, etc., to achieve the effects of less side reactions, simple synthesis process, and simple growth device

Active Publication Date: 2014-11-12
NANJING UNIV OF INFORMATION SCI & TECH
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  • Preparing method for methylamine bromide lead crystals of large-size perovskite structure
  • Preparing method for methylamine bromide lead crystals of large-size perovskite structure
  • Preparing method for methylamine bromide lead crystals of large-size perovskite structure

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Embodiment 1

[0026] The preparation method of large-scale perovskite structure methylammonium bromide lead crystal, the steps are as follows:

[0027] 1) Weigh 0.01mol of PbBr 2 , with 25ml of HBr solution with a mass concentration of 48% dissolved at room temperature to prepare Pb 2+ - HBr solution;

[0028] 2) According to HBr and CH 3 NH 2 The molar ratio is 1:1, respectively measure the HBr solution with a mass concentration of 48%, and the CH with a mass concentration of 40%. 3 NH 2 Each solution was 2.32ml, 1.72ml, the two solutions were mixed and sealed, and placed in an ice-water bath at 0°C for 2h to obtain CH 3 NH 2 Br solution;

[0029] 3) At room temperature, the Pb 2+ -HBr solution with CH 3 NH 2 The Br solution was mixed, and an orange-red solid substance appeared at the bottom immediately, and the solution was preheated in a 70°C water bath for 48 hours;

[0030] 4) While keeping the solution temperature at 70°C, remove the orange-red solid substance by filtration...

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Abstract

The invention discloses a preparing method for methylamine bromide lead crystals of a large-size perovskite structure. According to the preparing method, PbBr2 is dissolved with a HBr solution to obtain a Pb <2+>-HBr solution; the HBr solution and a CH3NH2 solution are mixed according to the mole ratio of 1:1, and react for two hours at the temperature of 0 DEG C to obtain a CH3NH2Br solution; then the obtained Pb <2+>-HBr solution and the CH3NH2Br solution are mixed and preheated for 48 hours at the temperature of 70 DEG C to obtain a CH3NH3PbBr3 super-saturated solution which is filtered to obtain clear yellow liquid, the clear yellow liquid is preheated for 12 hours in water bath with the temperature of 70 DEG C, the temperature falls to 50 DEG C, and the clear yellow liquid is evaporated at the constant temperature to obtain the CH3NH3PbBr3 crystals. According to the preparing method, in the process, the HBr solution participates in raw material synthesis and is the solvent for growth of the crystals, and the method has the advantages that the synthetic process is simple, and the side reaction is less; the growth device is simple, and the high-quality and large-size crystals can grow.

Description

technical field [0001] The invention relates to a method for preparing a large-sized perovskite structure methylammonium lead bromide crystal, which is a method for artificially cultivating crystals by adopting a solution evaporation method, and belongs to the technical field of crystal material preparation. Background technique [0002] From 2009 to 2013, CH 3 NH 3 wxya 3 (X=Cl, Br, I) The power conversion efficiency of perovskite solar cells ranges from 3.8% to more than 15%. Worldwide, the research on perovskite solar cells has reached unprecedented popularity, and it was selected into the "Science" magazine Published top ten scientific and technological breakthroughs in 2013. This kind of material combines the high carrier mobility of inorganic components and the good flexible processing performance of organic components, which can efficiently absorb broad-spectrum light from visible light to 800nm ​​wavelength, and can also be used in TiO 2 , Al 2 o 3 The char...

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Application Information

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IPC IPC(8): C30B7/02C30B7/14C30B29/54
Inventor 苏静仲坤缪菊红雷勇史鹏飞朱万祺
Owner NANJING UNIV OF INFORMATION SCI & TECH
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