High photoelectric conversion efficiency and high thermal stability perovskite material and preparation method

Abstract

The invention discloses a perovskite material with high photoelectric conversion efficiency and high thermal stability and a preparation method thereof. The structure of the perovskite material is a perovskite crystal form, and the component is APbI3·xEDAPbI4, wherein A is methylamine or cesium Ions, EDA is ethylenediamine ion, 0.012<x<0.051. The preparation method is to directly dissolve the EDAPbI4 solution and cesium iodide (CsI) or methylamine iodide (MAI) and the complex (PbI2 HI) of lead iodide and hydroiodic acid into the solvent, and then apply the solution to the substrate The corresponding high photoelectric conversion efficiency and high thermal stability perovskite materials can be obtained by drying and annealing. The perovskite material has the characteristics of low production cost, high photoelectric conversion efficiency and good thermal stability.

Description

technical field [0001] The invention relates to a perovskite material and a preparation method, in particular to a perovskite material with high photoelectric conversion efficiency and high thermal stability and a preparation method. Background technique [0002] The current mainstream is CH 3 NH 3 PB 3 The representative organic-inorganic hybrid perovskite materials have been developed by leaps and bounds in the fields of solar cells, but with the deepening of related research, CH 3 NH 3 PB 3 The defects of poor material stability, especially poor thermal stability, began to emerge (Yang Xudong, Chen Han, Bi Enbing, Han Liyuan. Key issues in the development of high-efficiency perovskite solar cells[J]. Acta Physica Sinica, 2015,64(3):038404 .), seriously hindering its further industrial development, so it is of great practical significance to develop a material with simple preparation process, high photoelectric conversion efficiency and good thermal stability. [000...

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Problems solved by technology

[0002] The current mainstream is CH 3 NH 3 PB 3 The representative organic-inorganic hybrid perovskite materials have been developed by leaps and bounds in the fields of solar cells, but with the deepening of related research, CH 3 NH 3 PB 3 The defects of poor material stability, especially poor thermal stability, began to emerge (Yang Xudong, Chen Han, Bi Enbing, Han Liyuan. Key issues in the development of high-efficiency perovskite solar cells[J]. Acta Physica Sinica, 2015,64(3):038404 .), seriously hindering its further industrial development, so it is of great practical significance to develop a material with simple preparation process, high photoelectric conversion efficiency and good thermal stability

[0003] Existing studies have shown that CH 3 NH 3 PB 3 The root of the material's poor thermal stability is its use of CH, an organic functional group that is easily decomposed and volatilized by heat 3 NH 3 It is closely related, and the introduction of 2D structure to construct a composite structure of perovskite is considered to be an effective way to improve the thermal stability of perovskite materials, but 2D materials often break the continuous metal framework of the perovskite system , resulting in low device efficiency; CsPbI 3 The type inorganic hybrid perovskite material is a new type of photovoltaic material, which uses a thermally stable inorganic cation cesium to replace the organic amine cation that is easily decomposed and volatilized by heat, but CsPbI 3 Phase transition will occur at room temperature, and often only non-perovskite structures with poor photoelectric conversion efficiency can be obtained. To obtain perovskite phases with excellent photoelectric properties, it often needs to be heated above 350 ° C. At the same time, the currently reported CsPbI 3 Materials tend to have low photoelectric conversion efficiencies (less than 9%), limiting their large-scale applications

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