Space limited growing method of two-dimensional hybrid perovskite crystal

Abstract

The invention discloses a space limited growing method of a two-dimensional hybrid perovskite crystal. A crystal growing region is formed by using two pieces of upper and lower substrates, the growingregion is filled with a crystal growing solution, the growing of the perovskite crystal in a two-dimensional plane is restricted by using the growing solution in the region to inhibit the growing ofthe crystal outside a vertical plane, and therefore a large-size, high-quality two-dimensional hybrid perovskite crystal is obtained on the surfaces of the substrates. On the other hand, an oleic acidsurface modifier or a surface modifier similar to oleic acid are added to the crystal growing solution, and the surface modifier attaches to the surface of the crystal to further limit the growing ofthe crystal outside the two-dimensional plane. By means of the method, the defects of smaller size of the two-dimensional hybrid perovskite crystal growing through a traditional solution method, complicated procedures and expensive equipment of the two-dimensional hybrid perovskite crystal growing through a gas phase condensing method and the like can be overcome.

Description

technical field [0001] The invention relates to a preparation method for obtaining a two-dimensional crystal growth of a hybrid perovskite material by means of space limitation, and obtains a high-quality two-dimensional crystal with a longitudinal dimension of submillimeter level and a thickness of several nanometers. Background technique [0002] Organic-inorganic hybrid perovskite crystals (CH 3 NH 3 wxya 3 , X=Cl, Br, I; hereinafter referred to as MAPbX 3 , MA=CH 3 NH 3- ) is a cost-effective optoelectronic semiconductor material. Because hybrid perovskite crystals have high light absorption efficiency, long carrier lifetime and diffusion length, and low defect density, as a new generation of solar energy conversion materials, it was first reported in 2009 by the Miyasaka research group of Toin Yokohama University in Japan. After achieving a photoelectric conversion efficiency of 3.8% in hybrid perovskite solar cells, it quickly increased to a maximum conversion ef...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the disadvantages of using a single substrate to grow perovskite crystals in an open solution, the present invention has relatively large thickness and poor growth controllability, and proposes a space-limited two-dimensional hybrid perovskite crystal growth method

This method can overcome many shortcomings such as the small size of the traditional solution method to grow two-dimensional hybrid perovskite crystals, and the cumbersome process and expensive equipment for growing two-dimensional hybrid perovskite crystals by vapor deposition.

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