Preparation method of tin dioxide/metal sulfide composite electron transport layer and its application in perovskite solar cells

Abstract

The invention discloses a preparation method of a tin dioxide / metal sulfide composite electron transport layer and its application in a perovskite solar cell. Specifically, when the tin dioxide is prepared, a corresponding metal salt and a sulfur source are added to the precursor solution. compound, one-step in-situ compounding to obtain a tin dioxide / metal sulfide solution, which is then spin-coated on conductive glass and subjected to low-temperature annealing to obtain a composite electron transport layer, followed by deposition of a perovskite layer, and blade-coated carbon electrodes to assemble the perovskite Solar battery. When preparing tin dioxide, the invention can in-situ composite metal sulfide, which can passivate the defect state of tin dioxide to increase its electron mobility, adjust its energy band structure and introduce intermediate energy levels to improve the energy level of perovskite. The matching property can also increase the interface contact with the perovskite layer and reduce the interface defects, and realize the preparation of efficient and stable perovskite solar cells. The invention has the advantages of simple preparation process, mild reaction conditions, low cost, easy popularization and commercial application prospect.

Description

technical field [0001] The invention belongs to the fields of new material technology and new energy technology, and particularly relates to a preparation method of a tin dioxide / metal sulfide composite electron transport layer and its application in a perovskite solar cell. Background technique [0002] The electron transport layer is an important part of perovskite solar cells, and its main function is to separate the electron-hole pairs generated after the perovskite layer absorbs photons, and block holes while extracting electrons. On the other hand, for n-i-p traditional structure perovskite solar cells, the surface roughness, dangling bond type, defect state type, etc. of the electron transport layer directly affect the crystal growth quality of the perovskite film deposited on its surface, so its It plays a vital role in improving the photovoltaic performance of the device. An excellent electron transport material needs to have high transmittance, good carrier mobili...

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Problems solved by technology

However, the effect of these methods is relatively simple, and the introduction of other materials for modification by interface engineering will form a new interface, thereby increasing the internal resistance of the battery, hindering the migration of charges and the efficient output of current, and cannot fully overcome the shortcomings of tin dioxide and improve the performance of the battery. performance

In addition, the commonly used solution method to prepare tin dioxide electron transport layer has a problem that lower annealing temperature will reduce the crystallinity of the film and reduce electron mobility, while high annealing temperature may destroy the tin dioxide film and generate a large amount of charge traps and pinholes

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