Antireflection Effect Of Micro Λ-shape Array And Its Application In Solar Cells

Antireflection has been receiving people’s attention for long time because of its wide application in various fields. In this thesis, we proposed a micro A-shape array whose scale is wider than incident wavelength on basis of previous antireflection papers. The antireflection properties of this micro A-shape array were investigated through finite element method complemented by COMSOL multiphysics. It was found that the antireflection properties were related to the substrate material, structure parameter, etc. As antireflection is needed in solar cells, we applied this micro A-shape array to TiO2film of dye-sensitized solar cells in order to increase its absorption efficient. The specific research content of this thesis is listed as below:1. Light trapping properties of the micro A-shape array was systematically investigated. It was found that this micro A-shape array could suppress the reflectivity and transmittance of incident light to a very low level in a quite broad band and incident angle through finite element method complemented by COMSOL multiphysics. This indicated good property of light trapping. Through simulation, we demonstrated the existence of internal reflection in the A-shape structure which explained this light trapping effect. Afterwards, we observed the influence of refractive index to the light trapping effect by changing the substrate material. Furthermore, we designed another microstructure on basis of the micro A-shape array which significantly improved the effect of internal reflection in the structure. Experimentally, we fabricated a micro-needle array by tube etching method and measured its reflectivity and transmittance. Those results demonstrated our pervious deductions. At the same time, we briefly discussed the formation of glass micro-needle array by introducing diffusion model.2. The micro A-shape array was applied to the TiO2film of dye-sensitized solar cells. Through simulation, it was shown that light absorption of the TiO2film was largely enhanced by this micro A-shape array and the TiO2film exhibited great light trapping effect under visible light. By changing the height and period of the A-shape structure, it was found that the influence of structure parameters to light scattering was very important. When the light was incident from front side and back side respectively, the light trapping properties of the TiO2film were different.