Lanthanide rare-earth ion-based CsPbBr3-doped all-inorganic perovskite solar cell and preparation method and application thereof

Abstract

The invention provides a lanthanide rare-earth ion-based CsPbBr3-doped all-inorganic perovskite solar cell and preparation method and application thereof. The preparation method comprises the steps ofmixing lanthanide rare-earth ions into a CsPbBr3 precursor solution, spinning a surface of a titanium dioxide transmission layer by a multi-step spinning technology to prepare a uniform and compact inorganic perovskite thin film, and finally, depositing a layer of carbon back electrode on a surface of the perovskite thin film to assemble the lanthanide rare-earth ion-based CsPbBr3-doped all-inorganic perovskite solar cell. By doping the lanthanide rare-earth ions, the transmission path of photo-generated carriers in a cell device is optimized, the electron lifetime is prolonged, and the photoelectric conversion efficiency and the stability of the cell are improved; and meanwhile, the preparation method has the characteristics of simplicity, no hole transmission layer, low cost, large rare-earth element combination space and the like and is an effective mode of improving the performance of the all-inorganic perovskite solar cell and reducing the fabrication cost.

Description

technical field [0001] The invention belongs to the field of new material technology and new energy technology, and specifically relates to doping CsPbBr based on lanthanide rare earth ions 3 All-inorganic perovskite solar cells and their preparation methods and applications. Background technique [0002] Solar cells are photoelectric conversion devices that directly convert light energy into electrical energy. They have the advantages of high conversion efficiency, no pollution, and no geographical restrictions. Among them, perovskite solar cells are one of the most dazzling devices in the photovoltaic field in recent years, with a photoelectric conversion efficiency of 22.7%. However, the poor stability of conventional organic-inorganic hybrid perovskites in high-temperature or high-humidity environments severely restricts their commercialization. For this, based on CsPbBr 3 All-inorganic perovskite solar cells with light-absorbing layers have attracted extensive attent...

AI Technical Summary

Problems solved by technology

[0003] However, there are still several key issues unresolved in the research on all-inorganic perovskite solar cells: First, conventional CsPbBr 3 The optical band gap of the perovskite film is about 2.3 eV, which can only absorb sunlight with a wavelength of less than 550nm, so that the photoelectric conversion efficiency of the current battery is still lower than 10%; second, CsPbBr 3 Due to the existence of a large number of defects in the perovskite film, the lifetime of photogenerated electrons in the perovskite film is short, which is not conducive to further improving the performance of the battery; third, due to the hole transport materials (such as Spiro-OMeTAD) and the traditional back The use of electrodes (such as gold) results in a higher cost of the battery

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