Abstract
Structure and properties of anti-reflection thin films of spherical silicon solar cells were investigated and discussed. Conversion efficiencies of spherical Si solar cells coated with F-doped SnO2 anti-reflection films were improved by annealing. Optical absorption and fluorescence of the solar cells increased after annealing. Lattice constants of F-doped SnO2 anti-reflection layers, which were investigated by X-ray diffraction, decreased after annealing. A mechanism of atomic diffusion of F in SnO2 was discussed. The present work indicated a guideline for spherical silicon solar cells with higher efficiencies.
Highlights
Solar cells are expected to be clean energy devices instead of fossil fuels
Conversion efficiencies of spherical Si solar cells coated with F-doped SnO2 anti-reflection films were improved by annealing
Lattice constants of F-doped SnO2 anti-reflection layers, which were investigated by X-ray diffraction, decreased after annealing
Summary
Solar cells are expected to be clean energy devices instead of fossil fuels. They are clean energy devices which discharge no greenhouse gas. Reduction of the cost of solar cells is an important issue. To Improve the efficiencies of the Si solar cells [8], formation of a texture structure on Si surface [9,10,11], optimization of structures of reflectors [12,13,14], reduction in resistance and high transmission of anti-reflection films [15,16,17] are needed. The purpose of the present work is to investigate spherical Si solar cells with anti-reflection (AR) SnO2:F thin films
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