Antireflective Coating Design of Spherical Silicon Solar Cell with Reflector Cup by Ray-Tracing Simulation
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概要
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An optimum design of an antireflective (AR) coating for a spherical Si solar cell with a reflector cup has been analyzed with a three-dimensional (3D) ray-tracing simulation. The 3D ray tracing is required to estimate the short-circuit current density (<I>J</I><SUB>sc</SUB>) because of an incident light angle distribution on a solar cell surface. In the simulation, the solar cell consists of a spherical Si solar cell with a diameter of 1 mm covered by an AR coating without surface texturing, and a hemispherical reflector cup with an aperture of 2 mm. The calculations of AR coating thickness (<I>t</I>) and refractive index (<I>n</I>) dependences on <I>J</I><SUB>sc</SUB> revealed that an optimum <I>J</I><SUB>sc</SUB> of 39.7 mA/cm<SUP>2</SUP> can be obtained at <I>t</I>=78 nm and <I>n</I>=2.0. Also, a higher design tolerance in an optical film thickness of the AR coating is demonstrated, which is especially advantageous for spherical Si solar cells which inherently have some technical difficulties in a uniform AR coating formation.
- 公益社団法人 応用物理学会の論文
公益社団法人 応用物理学会 | 論文
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