| Perovskite solar cells have been rapidly developed because of their high light absorption efficiency,long carrier lifetime,high lattice defect tolerance,and adjustable energy band.In a few years,the solar PCE of perovskites solar cells has reached 22.1%.The traditional material of light absorbing layer of perovskite solar cells is CH3NH3 Pb I3,however,its instability and lead toxicity have limited the practical application of perovskite and large-scale industrialization prospects.Therefore,optimizing and improving perovskite materials in terms of stability and non-toxicity has gradually become one of the key research directions in recent years.On this basis,a series of inorganic lead-free perovskite materials have entered the field of vision.Compared with traditional perovskites,this type of materials has greatly improved both stability and toxicity.In this paper,two major new types of inorganic lead-free perovskite materials are prepared by hydrothermal method and solid phase method.The specific research content is as follows:1.A novel inorganic lead-free double perovskite material,Cs2 Bi Ag Br6,was prepared by solid-phase method.The doping and substitution of Br by different halogen elements were then carried out,to optimize the bandgap of Cs2 Bi Ag Br6 material without changing the crystal structure of the material.2.A novel inorganic lead-free perovskite derivative material,Cs3Bi2I9,was prepared by using a solution method and a hydrothermal method.The structure and optical properties of the new material were characterized.Then we try to use different trivalent metal cations(In,Ru,etc.)to replace Bi to reduce the band gap and improve stability.3.The new perovskite material Cs3Ru2X9(X=Cl,Br)was prepared by hydrothermal method.The electrocatalytic performance of the electrolyzed water was tested and a good overpotential of hydrogen evolution from electrolyzed water was obtained.It developed the application of perovskite materials in the field of electrocatalysis. |
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