Analysis Of The Optical Absorption Of Ag Nanowires On Different Solar Cell Structures Under Fixed Volume Ratio

Silicon thin-film solar cells are devices that convert solar energy into electricity based on semiconductor materials.It has the advantages of low production cost,small pollution and great potential.However,the light absorption efficiency of the conventional silicon thin film solar cell is low.Therefore,this paper proposed a solution for adding Ag nanowires based on changing the grating shape.On the one hand,this paper studies the influence of different shapes of grating on the light absorption of the solar cell structure,and optimizes the grating height of each structure,on the other hand,Ag nanowire arrays were introduced after the optimal height of each structure was determined.Furthermore,the influence of cross-sectional area,distribution density and shape of Ag nanowires on the light absorption efficiency of the solar cell structure was analyzed.In the aspect of grating research,this paper analyzes the effects of the triangular grating,rectangular grating,sinusoidal grating and the mixed gratings on the light absorption of solar cells.Since the volume of Si absorption layer has a very significant impact on the light absorption efficiency of solar cell structures,each grating structure is optimized only for the grating height in the optimization process,thus,the influence on the light absorption efficiency of the solar cell models due to the change of the Si absorption layer volume will be eliminated.The simulation results show that:(1)Triangular,rectangular and sinusoidal gratings have some enhancement on the light absorption of the solar cell models.The triangle and the sinusoidal grating have the advantages of anti-reflection effect,while the rectangular grating model appears better Febry-Perot(F-P)mode.(2)Triangles and sinusoidal gratings enhance the light absorption efficiency of the solar cell models better than rectangular gratings.Therefore,in the design on back gratings,we give priority to the triangular and sinusoidal grating.(3)In the process of optimizing the height of the gratings,the optimum height of each grating structure is different.(4)It is concluded that the short circuit current density of the hybrid raster model is not necessarily larger than the optimal model under the uniform height of the three gratings.The regular distribution of Ag nanowire arrays was added to the Ag-Si junction for each model of fixed Si volume ratio and the light absorption of these solar cell models containing Ag nanowire arrays was analyzed.The research of Ag nanowire arrays mainly considers three factors: shape,cross-sectional area and distribution density.The simulation results of all the models show that:(1)The light absorption of the solar cell models will be enhanced significantly by the nanowires under certain cross-sectional area and distribution density.(2)The circular Ag nanowire arrays enhance the light absorption of the solar cell model better than that of the rectangular Ag nanowire arrays.(3)The enhancement effect of Ag nanowire arrays on the absorption of solar cell model is more significant in the rectangular grating model.In this paper,we also improve the Ag nanowire arrays under the optimal conditions.The results show that the new type of solar cells with Ag nanowire ring arrays have a higher light absorption than those with circular Ag nanowire arrays.