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Cesium-lead halide perovskite crystal materials with high photoelectric response efficiency and stability at room temperature as well as preparation method and application of cesium-lead halide perovskite crystal materials

A photoelectric response and crystal material technology, applied in polycrystalline material growth, chemical instruments and methods, crystal growth, etc., can solve the problems of high-concentration ion doping difficulties and large differences in solubility, etc., to reduce dark current density, The effect of widening the absorption range and increasing the photocurrent density

Inactive Publication Date: 2018-10-23
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, Cs + , Pb 2+ 、Br - , I - Originated from different reagents, the solubility in the growth solution is quite different, making it difficult to dope high concentrations of ions

Method used

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  • Cesium-lead halide perovskite crystal materials with high photoelectric response efficiency and stability at room temperature as well as preparation method and application of cesium-lead halide perovskite crystal materials
  • Cesium-lead halide perovskite crystal materials with high photoelectric response efficiency and stability at room temperature as well as preparation method and application of cesium-lead halide perovskite crystal materials
  • Cesium-lead halide perovskite crystal materials with high photoelectric response efficiency and stability at room temperature as well as preparation method and application of cesium-lead halide perovskite crystal materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take 10.276g PbBr 2 Place in a 50mL beaker and stir to dissolve completely, then add 2.982g of CsBr, raise the temperature to 120°C, and stir until completely dissolved. The beaker was sealed with plastic wrap, and a 1 cm long thin line-shaped opening was drawn. Put the solution in an oil bath at 120 °C, the solvent evaporates slowly, and CsPbBr is precipitated when it reaches supersaturation 3 crystals. The crystals were taken out, washed quickly with DMF, and the solution attached to the surface of the crystals was removed after repeated washings.

[0036] Photographs of the obtained crystals are shown in figure 2 Shown in a. figure 2 Middle a shows CsPbBr 3 The crystal is transparent, the crystal quality is high, and the size is large, its size is 5.10×4.91×1.43mm 3 . The crystalline phase of the prepared product was analyzed by Japan Rigaku Mini Flex II type X-ray powder diffraction test, the results are as follows image 3 . by CsPbBr 3 The X-ray powder...

Embodiment 2

[0038] Take 9.248g PbBr 2 Place in a 50mL beaker and stir to dissolve completely, then add 1.290g PbI 2 Stir to make it dissolve completely, finally add 2.982g of CsBr, raise the temperature to 120°C, and stir until completely dissolved. The beaker is sealed with a plastic wrap, and a 1 cm long thin line-shaped opening is drawn. Put the solution in an oil bath at 120°C, the solvent evaporates slowly, and CsPbBr is precipitated when it reaches supersaturation 2.8 I 0.2 crystals. The crystals were taken out, washed quickly with DMF, and the solution attached to the surface of the crystals was removed after repeated washings.

[0039] Photographs of the obtained crystals are shown in figure 2 Shown in b. figure 2 Middle b shows CsPbBr 2.8 I 0.2 The crystal is transparent, the crystal quality is high, and the size is large, its size is 5.60×4.60×1.56mm 3 . The crystalline phase of the prepared product was analyzed by Japan Rigaku Mini Flex II type X-ray powder diffract...

Embodiment 3

[0042] Take 8.236g PbBr 2 Place in a 50 mL beaker and stir to dissolve completely, then add 2.5816g PbI 2 Stir to dissolve completely, then add 2.982g CsBr, raise the temperature to 120°C, and stir until completely dissolved. The beaker is sealed with plastic wrap, and a 1 cm long thin line-shaped opening is drawn. Put the solution in an oil bath at 120°C, the solvent evaporates slowly, and CsPbBr is precipitated when it reaches supersaturation 2.6 I0.4 crystals. The crystals were taken out, washed quickly with dimethyl sulfoxide, and the solution attached to the surface of the crystals was removed after repeated washings.

[0043] Photographs of the obtained crystals are shown in figure 2 As shown in c. figure 2 Middle c shows CsPbBr 2.6 I 0.4 The crystal is relatively transparent, the crystal quality is high, and the size is large, and its size is 3.70×3.40×2.00mm 3 . The crystalline phase of the prepared product was analyzed by Japan Rigaku Mini Flex II type X-ra...

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Abstract

The invention discloses perovskite type CsPbBr3-xIx crystals with high photoelectric response efficiency and stability at room temperature as well as a preparation method and application of the perovskite type CsPbBr3-xIx crystals. The preparation method comprises the step of enabling PbBr2, PbI2, CsBr and dimethyl sulfoxide, which are used as raw materials, to grow by adopting an inverse temperature evaporation crystallization method so as to obtain the perovskite type crystal materials with large sizes, high crystal quality and uniform distribution of Br and I, wherein the ratio of amount ofsubstance of Pb <2+> to Cs<+> is equal to 2 to 1, and the ratio of amount of substance of the Br to the I us equal to (14 to 1)-(2 to 1). The crystal materials not only have good stability, but alsointroduce a new energy level into a band gap by doping iodide ions, so that the absorption edges of the crystal material are red-shifted, and the light absorption range is broadened. Furthermore, a proper amount of iodine is doped, so that the dark current density of the crystals is reduced, the photoresponse time is shortened, and the photocurrent density is increased; therefore, the response rate, detection rate and external quantum efficiency of the crystals as a photodetector are increased.

Description

technical field [0001] The invention belongs to the field of perovskite photoelectric materials, in particular to a class of perovskite-type CsPbBr with high photoelectric response efficiency and stable room temperature 3-x I x Crystals and their preparation and applications. Background technique [0002] With the development of society, non-renewable resources are decreasing day by day, and the problem of energy shortage has become the primary problem that human beings need to solve. Solar energy has many advantages such as cleanness, abundance, and no pollution, and has attracted more and more people's attention. In recent years, perovskite materials have been widely studied as a new type of material, especially when they are used as photovoltaic materials, they have shown excellent performance. At present, the efficiency of organic-inorganic metal halide thin-film solar cells with a perovskite structure has increased from the initial 3.8% to 21%. However, the poor che...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/12C30B7/06
CPCC30B7/06C30B29/12
Inventor 胡晓琳王雅静孟明明陈新庄乃锋
Owner FUZHOU UNIV
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