Design Of High-Efficiency Quasiinterdigital Back-Contact Perovskite Solar Cells Based On Subwavelength Structures

With the decreasing of traditional fossil energy,the utilization of clean and renewable energy is in urgent need of development.Solar cells can use the photovoltaic effect to convert solar energy into electricity,thereby reducing the consumption of traditional energy.With the development of solar cells,perovskite solar cells have received more and more attention,so how to further improve the photoelectric conversion efficiency of perovskite solar cells has become a key issue.Due to the excellent light trapping effect of subwavelength structures,they are now widely used in the light-harvesting design of solar cells.Based on this background,this paper used the finite element analysis software COMSOL Multiphysics to study a novel quasi-interdigital back-contact perovskite solar cell,and designed a subwavelength structure to improve the photoelectric conversion efficiency of the cell.This provides a new idea for improving the optoelectronic properties of perovskite solar cells.Firstly,the working principle and basic structure of solar cells were introduced,and the research progress and status of perovskite solar cells were investigated,and then the main research content of this paper was determined.The principle and analysis steps of the finite element analysis method were expounded,then the wave optics module of COMSOL Multiphysics software and the basic flow of simulation were introduced,which lay the foundation for the next step of solar cell simulation.Secondly,a quasi-interdigital back-contact perovskite solar cell was constructed using COMSOL Multiphysics software simulation and its planar structure size was optimized.The effect of constructing biomimetic nano-moth-eye texture on the surface of perovskite solar cells on the photoelectric performance of the cells was studied,and the changes of the cell performance under the oblique incidence of sunlight were analyzed.The study found that the moth-eye texture structure of the hemi-ellipsoid has the best light trapping ability and can achieve light absorption enhancement in a wide spectrum and wide angle range,and the mechanism of its light trapping synergy was analyzed.Finally,three-terminal tandem solar cells were constructed using quasi-interdigital backcontact perovskite cells and ultra-thin back-contact crystalline silicon cells.The effects of embedding metal particles inside silicon and constructing a structured metal back reflector on the optoelectronic properties of crystalline silicon sub-cells were investigated,respectively.The study found that when hemispherical silver particles were embedded in the crystalline silicon sub-cell,the photoelectric performance of the crystalline silicon subcell was the best,and its mechanism of photoelectric performance enhancement was analyzed.Then,the effect of moth-eye texture and composite array structure of metal particles embedded in crystalline silicon on the photoelectric performance of tandem cells was investigated.Finally,a three-terminal double-sided tandem cell was designed to further improve the short-circuit current density of the crystalline silicon sub-cell,thereby improving the photoelectric conversion efficiency of the tandem cell.