Research On The Fabrication Of Large Area Organic-Inorganic Hybrid Perovskite Films And Solar Cells Prepared In Air

Solar energy is a green,clean and sustainable energy source.The solar energy market has developed rapidly in the past decade.In the photovoltaic industry based on solar energy resources,organic-inorganic perovskite solar cells are very rich in raw material reserves,do not require rare earth materials,and have low cost compared with other materials of solar cells?such as polycrystalline silicon solar cells?.In addition,it has excellent photoelectric characteristics such as adjustable energy band,excellent light absorption performance,and long carrier diffusion length.As the third-generation photovoltaic industry,perovskite solar cells provide very broad development and application prospects for the next generation photovoltaic industry.At present,the efficiency of perovskite solar cells prepared by glove boxes has reached 25.2%.Due to the sensitivity of high-efficiency hybrid perovskite solar cells to water and oxygen,the preparation process is usually completed in a glove box filled with inert gas.However,the operation in the glove box is difficult,the cost of purchasing the glove box is high,it is difficult to realize mass production in the glove box,and the preparation process is also quite complicated.The large area of perovskite solar cells is also difficult.At present,the effective area of perovskite solar cell devices prepared in the laboratory is mostly 0.04cm²,which is far from commercialization,which is both a challenge and an opportunity.The main research point of this paper is around the preparation of large-area organic-inorganic perovskite solar cells in air.The work carried out by the paper is as follows:?1?In the air,the antisolvent method?AS?process was improved to the hot spin coating method?HS?,and the reverse melting method and the hot spin coating method were used to obtain smooth and uniform MAPbI₃ thin film samples with different grain sizes.The MAPbI₃ film was characterized by emission scanning electron microscope?SEM?test,X-ray diffraction?XRD?test,ultraviolet-visible absorption spectroscopy test?UV-vis?and so on.The results show that the films prepared by the thermal spin coating method have better film quality,higher grain size,and better light absorption.?2?Using the MAPbI₃ perovskite film prepared above as a light absorbing layer,a small-area perovskite solar cell with an effective area of 0.04 cm² was prepared,and the highest values were 11.59%?AS?and 16.89%?HS?,respectively.The comparison between the J-V curve and the performance box diagram proves that using the HS method in air increases the film grain size,which greatly improves the device performance of the perovskite solar cell.?3?In addition,a large area?1cm²?perovskite solar cell was prepared.The maximum efficiency of the large area AS device is only 4.41%,while the HS device is 10.16%.After analyzing the JV curve and the performance box diagram,it is proved that the increase in grain size also improves the performance of large-area devices,and we compared the stability of large-area devices without packages in air.The results show that the crystal increase in particle size is beneficial to the stability of large-area devices in air.