Structure Optimization And Performance Numerical Simulation Of Concentrated Perovskite Tandem Solar Cells

As the energy crisis worsens,energy security issues become increasingly important.Pervoskite solar cells stand out for their excellent performance and lower cost,and have received widespread attention from researchers.As the technology developed,the efficiency of the pervoskite solar cells reached their limits.In response to the above problems,this paper,on the basis of the single-junction pervoskite solar cells,by stacking with other cells in order to improve the efficiency of solar cells,for the current mismatch and low cell efficiency of the cell for concentrating treatment,simulating the performance of the pervoskite solar stacked cells under concentrated light conditions and analyze the treatment,the specific research content and conclusions are follows:（1）By using mathematical calculation method and Scaps-1d software,the perovskite solar cells were modeled.Through the simulation of single-junction perovskite solar cells,the lead-based perovskite solar cell and tin-based perovskite solar cell were compared,and the conclusion was drawn that the performance of lead-based perovskite cells was better in all aspects.（2）By changing the thickness of each layer of lead-based perovskite solar cell,the Optimum thickness of each layer is obtained when the performance is optimal.The conclusions are as follows:the thickness of electron and hole collecting layer of the battery have little influence on the battery,and the thinnest value can be taken respectively.When the thickness of perovskite absorption layer is 400 nm,the performance of the battery is the best,and the thickness of transparent glass FTO layer is optimized to 100 nm.The cell efficiency after optimization reaches 26.39%,which is 1.46%higher than that without optimization.（3）By means of mathematical calculation,Scaps-1d software was used to establish the models of the c-Si cell and the CIGS cell,which are the base cells of conventional perovskite solar laminate cells.The optimal efficiency was obtained by optimizing the thickness of each layer material of the above two kinds of cells.By comparing the performance simulation results of c-Si cells and CIGS cells,it is concluded that c-Si cells are more suitable for perovskite cells in all aspects of performance.The optimal efficiency of the optimized c-Si cell is 19.34%,which4.94%higher than that without optimization.（4）The simulation results show that it is feasible to improve the efficiency of perovskite solar cells by concentrating light under different lighting conditions.The effect of light intensity on battery performance was studied.It is concluded that the battery efficiency is the highest when the battery under 20 Suns light intensity,the battery efficiency increases to 27.90%,and the efficiency increases by 5.72%compared with that under 1 Sun light intensity.The battery has 1.59 V open circuit voltage V_oc,415.75m A/cm²short circuit current density J_sc,and the filling factor FF of the battery is 84.51%.（5）The current matching between perovskite cell and c-Si cell is achieved by concentrating light on the bottom cell.The simulation results show that when the concentration ratio is 3.55 times,Top cell and bottom cell reach current matching,when the light intensity of the top battery is 20 Suns,the total efficiency of silicon-based perovskite tandem solar cell is 37.89%,which is 43.58%higher than the single lead-based perovskite batteries and 95.92%higher than the c-Si battery.