Study On Preparation And Performance Of Perovskite Solar Cells Based On Pld Technology

In the 21st century,the rapid development of human society has continuously increasing demand for resources.Thus,the development of new clean energy is essential.Organic-inorganic hybrid halide perovskite materials have become important materials for the development of clean energy due to their excellent optoelectronic properties,such as suitable bandwidth,strong light absorption capacity,and high carrier mobility,etc..At present,organic and inorganic perovskite materials have attracted broad attention in the field of solar cells.The perovskite solar cells have high photoelectric conversion efficiency and great application prospect,which can promote the sustainable development of human society.However,the quality of perovskite films plays a key role in the performance and life of solar cell devices.Among various optical thin film deposition technologies,pulsed laser deposition(PLD)technology has the advantages of easy operation and can be used to obtain the films of high quality.Therefore,in this thesis,the PLD technology is introduced to the preparation of inorganic perovskite thin films and applied to inorganic perovskite solar cells.The mainly completed two aspects of research work are as the following:1.PLD,instead of spin coating,was used to prepare CsPbBr₃ thin films,which were applied in perovskite solar cells.The CsPbBr₃ single crystal powders were synthesized by the solution method and then pressed into a target.The PLD technique was used to bombard the CsPbBr₃ target.The CsPbBr₃ thin film exhibited excellent fluorescence performance and maintained good stability in the high humidity environments.At the same time,during the process of preparing solar cells,we observed that the formed CsPbBr₃ plasma can penetrate into and be evenly distributed in the mesoporous Ti O₂ layer.Therefore,the effects of the thickness of mesoporous Ti O₂ and CsPbBr₃ films on the device performance were studied.The PCE of the best performance of the CsPbBr₃ perovskite solar cell reached 6.3%by continuously optimizing the thickness,the open circuit voltage was 1.37 V,the fill factor was72%,and the short-circuit current density was 6.4 m A/cm².2.Two-step method was applied to prepare CsPbBr_xI_3-x(x=0,1,2,3)films.Four targets were prepared using Cs Br,Cs I,PbB_r2,and PbI₂ as starting raw materials.CsPbBr_xI_3-x(x=0,1,2,3)films can be formed on the substrates by placing the corresponding two targets into the chamber and ablating them in the corresponding order.The CsPbBr_xI_3-x(x=0,1,2,3)thin films prepared by the two-step method of pulsed laser deposition technology have precisely controlled thickness and excellent fluorescence performance.We tested the fluorescence performance of the prepared CsPbBr_xI_3-x(x=0,1,2,3)thin film,and observed that the half height width of the fluorescence peak for CsPbBr_xI_3-x(x=0,1,2,3)thin film was in the range of 18.9-40.8 nm,the peak position of the fluorescence spectrum can be tuned between 513 nm and 663 nm.The measured time-resolved fluorescence spectra were fitted and the decay time was 8.93 ns,15.59 ns,7.49 ns,and 14.07 ns for CsPbBr_xI_3-x(x=0,1,2,3)thin films,respectively.The high quality CsPbBr_xI_3-x(x=0,1,2,3)films prepared by PLD technology have the advantages of low cost,simple operation and excellent photoelectric performance,can be applied to inorganic perovskite solar cells,optoelectronic devices and other fields,etc..