Method for preparing organic-inorganic hybrid perovskite single crystal based on two-phase process

Abstract

The invention provides a method for preparing an organic-inorganic hybrid perovskite single crystal based on a two-phase process. The method comprises the following steps: by taking a halide solutioncontaining a first reactant as a lower solution layer and taking an organic matter solution containing a second reactant as an upper solution layer, reacting the first reactant and the second reactantto produce the organic-inorganic hybrid perovskite single crystal wafer at an interface contact of the lower solution layer and the upper solution layer, wherein the density of the lower solution layer is smaller than that of the upper solution layer. The crystal structure having high degree of crystallinity and consistent crystal phase can be obtained, preparation of the crystal wafer of any shape and area can be realized, crystal destruction brought by later physical machining is avoided, and the structural integrity and consistency in crystal growth are ensured. The single crystal is grownby controlling the reaction temperature and concentration. A communicating vessel is increased, the single crystal wafer having the thickness of less than 50 microns can be directly grown, the operation is simple and convenient, the needed equipment is simple, low in cost and common in raw materials, and study in the aspect of improving the efficiency of a perovskite single crystal cell is facilitated.

Description

technical field [0001] The invention relates to a perovskite solar cell, in particular to an organic-inorganic hybrid perovskite single crystal preparation method based on a two-phase method. Background technique [0002] At present, human's demand for energy mainly depends on fossil energy. Although fossil energy reserves are abundant, they will eventually be exhausted, and their use will also cause certain pollution to the environment. Therefore, the development of renewable energy, the adjustment of energy structure, and the realization of sustainable energy development have attracted the attention of the whole world. [0003] Renewable energy mainly includes solar energy, wind energy and geothermal energy, etc. Among them, solar energy is an inexhaustible and efficient clean energy, and the solar radiation per second is equivalent to 5.9×10 6 The energy produced by burning tons of coal, and the use of solar energy is not affected by geographical factors. Therefore, usi...

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Problems solved by technology

[0005] According to research, the main factor affecting the efficiency of perovskite single crystal cells is the thickness of the single crystal. When the thickness of the perovskite single crystal sheet is 10um, the theoretical efficiency can reach 23.5%. In the case of concentration, the adjustment of conditions such as concentration cannot be realized, which is not conducive to the stable and uniform growth of crystals. In the case of continuous consumption of reactants, the continuous growth of crystals cannot be continuously guaranteed, and the area of ​​​​crystals cannot be controlled.

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