Research On Performance Of All-inorganic Perovskite Semitransparent Solar Cells Based On Transparent Silver Electrode

Semitransparent solar cells have broad application prospects in the fields of building integrated photovoltaics,power-generating windows,agricultural greenhouses,wearable electronic equipment,tandem cell modules,so they have received more and more research and attention,the key to achieve high performance semitransparent solar cells is how to maintain a balance between light absorption and light transmission in the visible light range.The all-inorganic metal halide perovskite material has many advantages,such as high light absorption coefficient,wide-range adjustable band gap,good environmental stability,high carrier mobility,and solution preparation,although the power conversion efficiency is low,but provides new opportunities for the development and application of semitransparent solar cells.The work of this thesis is based on the all-inorganic wide band gap Cs Pb I_xBr_3-x(x=0,1)perovskite material and silver transparent electrode,and has carried out the research of the performance improvement and application exploration of the semitransparent all-inorganic perovskite solar cell.The main content and results are as follows:1.Based on the demand for transparent electrodes on the top of semitransparent perovskite solar cells,the optical and electrical properties of ultra-thin silver film transparent electrodes and their effects on the performance of semitransparent perovskite cells has been systematically studied.The thickness of the optimized silver electrode is 11 nm,and introducing high refractive oxide(Te O₂/Mo O₃)anti-reflection layer,a silver transparent electrode with an average light transmittance of over 60%in the range of 350-600nm and a peak light transmittance of 80%has been achieved,which can meet the requirements of semitransparent Cs Pb IBr₂,Cs Pb Br₃ solar cell.2.In view of the limitations of the traditional one-step solution method Cs Pb IBr₂ solar cell with low open circuit voltage and low filling factor,an interface passivation method by spin-coating diamond nanoparticles on the Cs Pb IBr₂ film was proposed.The experiment found that the diamond particles tend to be distributed at the grain boundaries of Cs Pb IBr₂ and in the surface pinholes,it can inhibit carrier recombination and promote charge transfer,achieve a carbon-based Cs Pb IBr₂ solar cell with an open circuit voltage of 1.30V,fill factor greater than 60%,and a power conversion efficiency of 9.07%,and it can be maintained 86%initial efficiency after 50 days.3.In view of the low conversion efficiency and complicated process of Cs Pb Br₃ solar cells prepared by the traditional multi-step solution method,the two-step Cs Pb Br₃ film formation process based on aqueous solution was explored,and optimization strategies such as methanol/isopropanol additives and chloride ion doping were explored,not only improved the quality of perovskite crystals significantly,obtained a flat and smooth micron-sized Cs Pb Br₃ film,but also greatly simplified the production process of the Cs Pb Br₃ film,and realized a carbon-based Cs Pb Br₃ with a fill factor over 85%and power conversion efficiency of 10.37%firstly,and cell can maintain 85%initial efficiency after 50 days.4.Based on the silver transparent electrode,a all-inorganic semitransparent Cs Pb IBr₂,Cs Pb Br₃ solar cell was successfully prepared,and conversion efficiencies reach 8.46%and7.88%,respectively.It was further used as a top cell and commercial Si and Ga As solar cells to construct a four-terminal tandem cell.The segmented utilization of the solar spectrum is realized,and the efficiency of the cell was improved.In particular,for the insufficient efficiency loss of more than half of the Si bottom cell in the traditional perovskite/Si tandem cell,the Si bottom cell in the tandem cell in this paper retains 65.1%and 68.7%of the initial efficiency,respectively,which provides new ideas for high-efficiency wide band gap perovskite/Si tandem cell development.