Simulation Study Of Silicon Nanotube Solar Cells

Solar energy is considered as one of the most promising new energy because of its advantages of no pollution and abundant energy storage.As a device that converts light energy directly into electric energy,solar cell has become a popular industry and research field.However,due to its high production cost and low conversion efficiency,it has not been widely used.Therefore,improving the conversion efficiency and reducing the cost of solar cells are the main research objectives.Nanostructured solar cells have the advantages of high conversion efficiency,less silicon material consumption,low quality requirements for silicon(so as to reduce the environmental pollution caused by the preparation of crtstalline silicon)and so on.In this paper,the silicon solar cell is taken as the research object,and the nanotube structure is designed and analyzed through optical and electrical simulation software.The specific content and results are as follows:First,in optical simulation software(FDTD Soultion),we design the structure of the nanotubes,and the results are compared with nano structure,under the same cycle,the optimized structure of nanotubes,due to a larger surface area,in the case of the vertical incident light,the overall total absorption spectrum compared with nano structure is improved about 11.1%.In addition,nanocolumns exhibit better optical properties even at different incident angles.Second,by importing the photon-number file generated by optical simulation into the electrical simulation(DEVICE),under the same axial doping condition,the ideal cell efficiency of the nanotube is 24%,while the efficiency of the nanocolumnar cell is only 13.7%.After considering recombination,the surface area of nanometer is larger,which leads to more violent surface recombination,but it is still higher than nanometer column battery.In addition,in electrical simulation,we also calculated the efficiency of nanotube batteries with different inner diameters.Although the absorption rate of nanotube batteries was the highest at the inner diameter of 320 nm,the final conversion efficiency was not the highest,indicating that good optical properties did not necessarily lead to good electrical properties.The results provide a new structure that could be used to make more efficient silicon solar cells.