Novel planar heterojunction perovskite solar cell with high efficiency and long life manufactured by adopting low-temperature solution method

Abstract

The invention discloses a novel planar heterojunction perovskite solar cell with high efficiency and long life manufactured by adopting a low-temperature solution method. The novel planar heterojunction perovskite solar cell is mainly characterized in that an ingenious design of an electron transmission multi-layer structure and a buffer layer structure is introduced into the cell, the electron conduction and extraction efficiency are increased, the stability of the cell is effectively improved, the conversion efficiency of the novel perovskite solar cell is significantly increased and the operating life of the cell is substantially prolonged. According to the novel planar heterojunction perovskite solar cell, the short-circuit current density is up to 23.95mA / cm<2>, and the cell conversion efficiency reaches 16.5%; and attenuation of the cell conversion efficiency in 6 months is less than 10% when the unencapsulated cell is stored in a dry atmosphere. In addition, the whole manufacturing procedure of the novel planar heterojunction perovskite solar cell is obtained through low-temperature processing by adopting the solution method, the process complexity and production cost can be significantly reduced, and the novel planar heterojunction perovskite solar cell is matched with large-area flexible substrates.

Description

technical field [0001] The invention belongs to the field of optoelectronic devices, and relates to the structural design of a novel high-efficiency and long-life planar heterojunction perovskite solar cell and a corresponding preparation method by a low-temperature solution method. Background technique [0002] With the increasing energy consumption in today's world and the gradual exhaustion of traditional energy sources such as coal and oil, the development of new energy sources has become more and more urgent and important. Among many types of new energy sources, solar cells are considered to be one of the most promising future new energy technologies because their energy comes from sunlight with huge energy reserves. After decades of research and development, although silicon-based solar cells have been mass-produced and have been widely used all over the world, the high production costs brought about by their complex production processes make silicon solar cells delaye...

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Problems solved by technology

However, the disadvantage of this structure is that, firstly, the preparation of this porous structure requires high temperature treatment (>450 degrees Celsius), which will face the same complex production process and high cost problems as silicon cells, and it is impossible to realize the integration with flexible substrates. Secondly, the device surface of this porous structure is composed of another layer of organic functional layer, which makes the stability of the device poor; while removing this layer of organic functional layer can improve the stability of the device, but it will also make the battery conversion Efficiency drops

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