The Numerical Simulation Of Light Scattering Properties Ofmetal Nanostructure On Microcrystalline Silicon Substrate

The popularity of solar cell should meet two conditions: first, the low cost; second, the high efficiency. The microcrystalline silicon thin film solar cell not only has rich raw materials, mature and relatively simple low temperature film forming technology, but also can be produced in the large scale on cheap substrate, eventually, making solar cell cheaper, because of the thinner absorbor layer, the light absorption efficiency is low, leading to the low of the photoelectric conversion efficiency. At present, in the field of solar cell, using the metal nanoparticles surface plasmonic resonate light-trapping technology to improve the light absorption efficiency of thin film solar cell has attracted a great deal of attention.In this degree paper, the solar cell light management technology is reviewed, and the application of metal nanoparticle surface plasmon light-trapping technology to the thin film solar cell is introduced, then the light scattering properties of matel nanoparticle and core-shell nanostructure are studied based on the finite element method(FEM) numerical simulation software COMSOL, at last, the wide spectrum light-trapping structure is designed for the microcrystalline silicon thin film solar cell. The conclusions as follow:1 The study of light scattering of metal nanoparticle: the light scattering property of the sphere nanoparticle with different size is studied, the results show: compared to Au and Cu, Ag and Al have the advantage of high-scattering and low-absorption; the radius of nanoparticle should be kept among 100 nm, although the coupling efficiency of the hemispherical and cylindrical nanoparticle is high, the scattering section is small.2 The study of light scattering of the core-shell nanostructure: the oxide layer Al2O3 can not make performance of metal nanoparticle bad; at the same size, the core-shell nanostructure Al@Ag is better than Al, the performance of Si O2@Ag is influenced by the shell material and shell thickness.3 The design of wide spectrum light-trapping structure for microcrystalline silicon thin film solar cell: the periodic distribution Al nanoparticle light-trapping structure is designed in front of the microcrystalline silicon thin film solar cell surface;when the R=50 nm, P=250 nm, the light absorption percent is 9.78%, and the improvement is among the short-wavelength, when R=100 nm, P=500 nm, the light absorption percent is 12.76%, and the absorption is near long-wavelength.The double period nanparticle light-trapping structure designed by using different size nanoparticle for the microcrystalline silicon thin film solar cell has the light absorption percent 25.7%, and explain the physical mechanism relatively with light absorption and the electric field distribution.