Research Progress and Countermeasures on the Interfacial Ultraviolet Stabilization of Perovskite Solar Cells
This paper focuses on the prominent UV instability of TiO2/perovskite interface in efficient n-i-p struc-tured perovskite solar cells,and the main reasons are analyzed.In addition,the main problems are analyzed and discussed in the process of adding down-conversion fluorescent materials and fully covering the TiO2 surface to a-chieve the stability of the perovskite solar cells.By comparison,metal salt is a suitable passivation material.How-ever,metal salt films are unable to fully cover TiO2,which is prepared by solution method.Further analysis gives the main reasons why metal salt is not easy to cover completely.There are two aspects of uncontrollable crystalli-zation behavior of metal salt precursors in micro-liquid film and solubility of perovskite solution to the prepared metal salt film.In this paper,a two-step strategy is proposed to achieve full coverage of metal salt on TiO2 surface.The first step has achieved ultrafine crystallization by using a low-pressure chamber device,that is,to preparing the"full"coverage.The second step has constructed a non-soluble surface by mercaptobenzene adsorption,that is,to protect the"full"coverage.Finally,specific research methods and strategies are proposed for the UV stability of TiO2/CsX/perovskite interface.In this paper,a set of coping strategies are established to improve the UV stability of the perovskite solar cells by adjusting the metal salt microstructure and the interface passivation.These will provide theoretical and technical support for the stability issues faced in the normal application of perovskite solar cells.
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