Study On The Thin Film Solar Cells Performance Based On The Inclined And Combined Micro And Nano Light Trapping Structures

As the energy crisis intensifies,solar energy has successfully attracted the public's attention in the new energies that emerged,for it's clean,renewable and inexhaustible,etc.However,the high cost and low conversion efficiency are two main problems for solar cells.Nanostructure is a popular solution in the field of light-trapping.In this paper,Comsol Multiphysics,which was based on the finite element method,was introduced to simulate several different light-trapping nanostructures,including inclined silicon nanowire,vertical silicon nanowire,silicon nanocone,aluminum nanohemisphere arrays and their combined structures.The relevant mechanisms were explained accordingly,which laid the foundation for the future preparation and application of nanostructures.Firstly,the research background of thin film silicon solar cells were introduced,then the research status of light-trapping nanostructure and its preparation technologies were described,and finally the purpose and significance of this paper were represented.Secondly,finite element method(FEM)was briefly introduced.Comsol Multiphysics,which was based on the FEM was described as well as its modeling steps,providing theoretical guidance for the next part.Furthermore,by introducing Comsol Multiphysics,solar cells with inclined silicon nanowire array were devised.With the optimization of the inclination angle,period and diameter,the effects of these variables on the optical properties were investigated and the optimal parameter range of the inclination angle was got.The inclined silicon nanowire's light harvesting ability was compared with the vertical ones.Relevent mechanism was explained according to the low symmetry and special geometric structures of the inclined silicon nanowire array.Finally,solar cells with three different combined nanostructures were designed by Comsol Multiphysics.The nanostructures on the top were silicon nanocone,vertical silicon nanowire and inclined silicon nanowire respectively.The nanostructures on the bottom were aluminum nanohemisphere arrays.By the adjustment of the nanostructures' period,diameter and other parameters,the effect of these variables on the solar cells' reflection,absorption and short circuit current density were studied deeply and the optimum structural parameters were got.The mechanism of improved light trapping ability of the solar cells patterned with nanostructures was discussed accordingly.