期刊
SOLAR ENERGY MATERIALS AND SOLAR CELLS
卷 115, 期 -, 页码 42-51出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solmat.2013.03.026
关键词
Reflected light distribution; Optical setup; Total internal reflection; Encapsulant; Refractive index
资金
- Australian Research Council's Centres of Excellence Scheme
- Australian Solar Institute
Reflected light from textured front surfaces of a solar cell contains useful information about the surface geometry as well as the optical properties of the cell. In this study, the 2-D reflected light distributions from front surfaces of silicon cells textured in various ways are characterised by an appropriate optical setup. The results are compared to those of conventional ray tracing. For surfaces with regular inverted pyramids, we identified reflected light diffraction patterns that can be explained by the principles of geometrical optics. These reflected light patterns can be used to extract details of surface morphologies and hence be used as a tool to fine tune and monitor fabrication processes. Surfaces with random pyramids reflect light without diffraction patterns but with other distinctive features. Their reflections lie primarily in the angular range between 0 degrees and 50 degrees, with a maximum intensity at about 25 degrees. The impact of the encapsulant's refractive index on the amount of total internal reflection is discussed for various types of textured surface. For both random and regularly textured surfaces, it appears possible to achieve higher total internal reflection ratio when the encapsulant's index increases from conventional 1.5 to 1.6. (C) 2013 Elsevier B.V. All rights reserved.
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