Mixed cation perovskite and preparation method therefor

A technology of mixed cations and perovskites, which is applied in semiconductor/solid-state device manufacturing, photovoltaic power generation, electrical components, etc., can solve the problem of single types, and achieve the effects of rich types, good photoluminescent properties, and good optical properties

Inactive Publication Date: 2016-06-22
SHANGHAI TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The purpose is to solve the shortcomings of the current single type of perovskite materials, thereby significantly enriching the types of perovskite materials and providing technical support for their application in the field of optoelectronics

Method used

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  • Mixed cation perovskite and preparation method therefor
  • Mixed cation perovskite and preparation method therefor
  • Mixed cation perovskite and preparation method therefor

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Embodiment 1

[0036] A mixed cation perovskite consisting of methylamine cations (CH 3 NH 3 + ), another organic amine cation, a metal cation and a halogen anion in a certain ratio.

[0037] The preparation method of described mixed cation perovskite is:

[0038] (1) Add 24ml mass concentration of 33% methylamine ethanol solution and 10ml mass concentration of 57% hydroiodic acid aqueous solution into a 250ml round bottom flask, stir and react at 0°C for two hours, use after the reaction The solvent was removed on a rotary evaporator at 50 °C. The obtained solid was purified by recrystallization. The specific steps were: redissolve the obtained solid in 80ml of absolute ethanol, then add 300ml of ether to precipitate the white precipitate, and filter it with a Buchner funnel. Recrystallization was repeated twice to obtain a white solid. Dry in a vacuum oven at 60° C. for 24 hours to obtain methyl iodide.

[0039] (2) 13ml mass concentration of 99% isopropylamine solution and 10ml mass...

Embodiment 2

[0045] A mixed cation perovskite consisting of methylamine cations (CH 3 NH 3 + ), another organic amine cation, a metal cation and a halogen anion in a certain ratio.

[0046] The preparation method of described mixed cation perovskite is:

[0047] (1) Add 24ml mass concentration of 33% methylamine ethanol solution and 10ml mass concentration of 57% hydroiodic acid aqueous solution into a 250ml round bottom flask, stir and react at 0°C for two hours, use after the reaction The solvent was removed on a rotary evaporator at 50 °C. The obtained solid was purified by recrystallization. The specific steps were: redissolve the obtained solid in 80ml of absolute ethanol, then add 300ml of ether to precipitate the white precipitate, and filter it with a Buchner funnel. Recrystallization was repeated twice to obtain a white solid. Dry in a vacuum oven at 60° C. for 24 hours to obtain methyl iodide.

[0048] (2) 2.68ml mass concentration is that 99% 1,2-propylenediamine solution ...

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Abstract

The invention provides a mixed cation perovskite and a preparation method therefor. The mixed cation perovskite is characterized in that the mixed cation perovskite is formed by the mixing of methylamine cation, organic amine cation, metal cation and halogen anion according to a certain ratio. According to the invention, the performance of the prepared perovskite material is detected, and is represented through an X-ray diffraction. The perovskite material is compared with CH3NH3PbI3, thereby obtaining a similar spectrogram. The apparent characteristic peaks can be observed nearby 14.1 degrees, 28.5 degrees, 31.9 degrees, 40.5 degrees and 43.1 degrees, thereby indicating that the new perovskite material is obtained. A UV visible near-infrared spectrophotometer indicates that the absorption spectrum of the material covers the whole visible light range within 800nm. A fluorescence spectrophotometer indicates that the material has good photoluminescence quality, has an apparent fluorescence peak nearby 800nm, and accords with the fluorescence peak of the CH3NH3PbI3. Therefore, the prepared perovskite material is similar to the conventional CH3NH3PbI3, and has the good optical performance.

Description

technical field [0001] The invention belongs to the technical field of photoelectric materials, and in particular relates to a new type of perovskite with mixed cations. Background technique [0002] The organic-inorganic hybrid perovskite semiconductor material represented by methylamino lead iodide compound (CH3NH3PbI3) has become a "star" in the field of photovoltaics. It combines excellent performances such as high light absorption capacity, high carrier transfer efficiency, high luminous efficiency, and adjustable band gap, and its application fields have gradually expanded to light-emitting diodes, lasers, fluorescent materials, and thermally conductive materials. [0003] Perovskite is an organic-inorganic hybrid material, the crystal is ABX 3 structure. In the perovskite crystal, B ions are located at the corners of the cubic unit cell, surrounded by 6 X ions to form a coordination octahedron, and a series of octahedrons are connected to form a periodic structural ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/46H01L51/48H01L51/42
CPCH10K85/00H10K85/30H10K30/00Y02E10/549
Inventor 林柏霖杨剑砺曽李阳喻妍庞曜奇李一婷
Owner SHANGHAI TECH UNIV
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