Performance Simulation And Parameter Optimization Of ZnSnN₂ Solar Cells

So far,countries all over the world are making great efficiencyorts to develop solar cells,regarding it as an important guarantee for the sustainable development of society.Solar cells have the characteristics of rich raw materials,non-toxic,stable and reliable properties compared with the mainstream silicon-based cells in the market and the emerging thin-film solar cells represented by Cd Te,CIGS and MAPb I₃,Zn Sn N₂.In addition,it also has the properties of large optical absorption coefficiencycient and adjustable band gap.Therefore,the solar cell with Zn Sn N₂as the core is worth studying.The current experimental results are few and the efficiencyciency is not good,because people just have a preliminary understanding of Zn Sn N₂.We can design the device structure by adjusting the parameters reasonably,so as to optimize the performance of Zn Sn N₂photovoltaic devices.The appropriate simulation can enable us to avoid repeated experiments for a long time with high cost,and we can summarize the rule of performance changing with parameters through the simulated data,which helps us to set up an appropriate direction in the early stage,so as to carry out more efficiencyective experiments later.In this paper,three kinds of solar cells with different structures,Zn Sn N₂/Cu Cr O₂,Zn Sn N2/Cu₂O and Zn Sn N₂/Ni O,are established.The matching of different layer thickness,recombination center concentration,critical recombination concentration,mobility and the relationship between electron concentration and efficiencyciency were simulated by wx AMPS software.It can be found that most of batteries can reduce the recombination center concentration and improve the efficiencyciency in a suitable range of mobility and electron concentration by matching the thickness of p-layer semiconductors and n-layer semiconductors.At the same time,a critical recombination concentration which can make the battery efficiencyciency increase with the increase of the thickness of the absorption layer is also found.Reaching the critical recombination concentration can greatly improve the efficiencyciency,which is the main factor affecting the battery efficiencyciency.In addition,we have also made a quantitative analysis of the three kinds of solar cells,and the efficiencyciency in the high concentration recombination center is close to the published experimental results,so we also clarify the direction of improving the efficiencyciency of Zn Sn N₂solar cells and establish a directional strategy for follow-up experiments.