Planar heterojunction perovskite solar cell and preparation method thereof

Abstract

The invention belongs to the technical field of solar cells and specifically discloses a planar heterojunction perovskite solar cell and a preparation method thereof. The planar heterojunction perovskite solar cell comprises a transparent conductive electrode, an electron transmission layer, a perovskite luminous absorption layer, a cavity transmission layer and a method electrode in sequence from down to up. The electron transmission layer is a TiO2 compact layer. The perovskite luminous absorption layer is made of a chloride-ion-doped perovskite material. According to the invention, a TiO2 mesoporous layer in a conventional sensitized solar cell is rejected, and the device structure and the preparation technology are simplified; the chloride-ion-doped perovskite material is used as the luminous absorption material, the film forming ability of a film is improved, and the diffusion and separation of carriers are facilitated; aimed at the processing of the transparent conductive electrode and the TiO2 compact layer, an oxygen plasma processing technology is provided, and the film forming effect is improved; and aimed at the thickness control problem of the perovskite luminous absorption layer, a layer-by-layer spin coating technology is adopted, and the photoelectric performance of the luminous absorption layer and the integral cell is regulated and controlled.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and in particular relates to a planar heterojunction perovskite solar cell and a preparation method thereof. Background technique [0002] Perovskite materials have excellent crystallographic characteristics and photoelectric properties. First, perovskite materials have near-perfect crystallinity, a feature shared by inorganic solar cell materials such as gallium arsenide and crystalline silicon, but making perfect inorganic solar materials usually requires very high temperatures, expensive vacuum equipment and complex The growth process, and high crystallinity perovskite materials can be synthesized by simple chemical methods at low temperature. At the same time, perovskite materials have excellent light absorption properties, with a bandgap width of about 1.5eV, and light absorption capacity more than 10 times higher than organic dyes. A 400nm thick film can absorb all photons in the ultra...

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Problems solved by technology

[0004] In the preparation process of the existing perovskite solar cells, a dense layer of titanium dioxide and a mesoporous layer of titanium dioxide are used, a total of two layers of titanium dioxide structure, there are a large number of grain boundary defects between the layer interfaces, and the two layers of TiO2 2 Two separate high-temperature annealings, the overall preparation process is complex, high energy consumption, low photoelectric conversion efficiency, seriously reducing the yield of such solar cells in large quantities, thus limiting the commercial application of such battery devices

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