Title :
Spherical silicon solar cells fabricated by high speed dropping method
Author :
Minemoto, Takashi ; Akashi, Yoshihiro ; Okamoto, Chikao ; Omae, Satoshi ; Yamaguchi, Yukio ; Murozono, Mikio ; Takakura, Hideyuki ; Hamakawa, Yoshihiro
Author_Institution :
Fac. of Sci. & Eng., Ritsumeikan Univ., Shiga, Japan
Abstract :
A spherical Si solar cell with semi-concentration system has been successfully fabricated based on a Si sphere fabricated by a high speed dropping method. The Si sphere is multicrystalline and typically shows the etch pit density of around 105 cm2 with spatial distribution. Our baseline process (not fully optimized yet) have produced the spherical Si solar cell with 10.4% efficiency. Quantum efficiency and laser beam induced current measurements revealed that an optimization in the optical design of the cell and the quality improvement of spherical Si crystals are needed for further high efficiency.
Keywords :
OBIC; elemental semiconductors; mirrors; optical design techniques; silicon; solar cells; 10.4 percent; Si; etch pit density; high speed dropping method; laser beam induced current measurements; optical design; quantum efficiency; semi-concentration system; spherical silicon solar cells; Costs; Crystalline materials; Crystallization; Current measurement; Etching; Optical device fabrication; Photovoltaic cells; Poles and towers; Silicon; Voltage;
Conference_Titel :
Photovoltaic Specialists Conference, 2005. Conference Record of the Thirty-first IEEE
Print_ISBN :
0-7803-8707-4
DOI :
10.1109/PVSC.2005.1488292
