Method for manufacturing uniform organic and inorganic perovskite crystal film on flexible substrate

Abstract

The invention discloses a method for manufacturing a uniform organic and inorganic perovskite crystal film on a flexible substrate. The method includes manufacturing an organic and inorganic perovskite crystal film on a conductive film by a dip-coating or spin-coating method, naturally drying, disposing the organic and inorganic perovskite crystal film in an annealing furnace for pre-annealing at the temperature lower than 100 DEG C, and removing organic solvent; adjusting a laser path and a micrometric-displacement platform so as to enable ultrashort-pulse laser to focus on the surface of the organic and inorganic perovskite film through an objective lens, and enable the surface of the organic and inorganic perovskite film to be perpendicular to a laser beam; when energy flux density of the ultrashort-pulse laser is larger than or equal to the threshold value, fusing and regrowing the perovskite materials at the focus and scanning the integral organic and inorganic perovskite film with the ultrashort-pulse laser to form a uniform organic and inorganic perovskite crystal film. By the method for manufacturing the uniform organic and inorganic perovskite crystal film on the flexible substrate, the uniform organic and inorganic perovskite crystal film is manufactured, no affection on performance of the flexible substrate is guaranteed and various requirements in practical application are met.

Description

technical field [0001] The invention relates to the field of preparation of planar heterostructure solar cell thin films, in particular to a method for preparing uniform organic-inorganic perovskite crystal thin films on a flexible substrate. Background technique [0002] Organometal halide perovskite crystal is a kind of compound semiconductor. Due to its high solar spectral absorption coefficient, the film layer can be made thinner, and it becomes the most ideal material for preparing planar heterojunction solar cells. However, planar heterojunction solar cells require that organic-inorganic perovskite crystal thin films must be uniform, pinhole-free, and have as few defects as possible. The commonly used preparation method is to prepare thin film by dip coating or spin coating process, and then use traditional high temperature annealing crystallization. However, during the high-temperature annealing process, the volatilization of the organic solvent produces pinholes; mo...

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Problems solved by technology

However, during the high-temperature annealing process, the volatilization of the organic solvent produces pinholes; moreover, due to the poor wettability and large contact angle of the organometallic halide on the substrate material, the high-temperature melt does not spread on the substrate, but contacts with the Separation of the substrate and the formation of island-like grains seriously affect the performance of planar heterojunction solar cells

[0003] Foreign researchers proposed to use the method of vapor deposition to obtain uniform perovskite films, but the vapor deposition method requires high vacuum and high-purity target materials, and it is difficult to achieve large-scale industrial production.

[0004] In summary, the quality of organic-inorganic perovskite films has become a bottleneck for the performance improvement of planar heterojunction solar cells

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