標題: The rigorous wave optics design of diffuse medium reflectors for photovoltaics
作者: Lin, Albert
Fu, Sze Ming
Zhong, Yan Kai
Tseng, Chi Wei
Chen, Po Yu
Ju, Nyan Ping
電子工程學系及電子研究所
Department of Electronics Engineering and Institute of Electronics
公開日期: 21-Apr-2014
摘要: Recently, diffuse reflectors are being incorporated into solar cells, due to the advantage of no metallic absorption loss, higher reflectance, decent light scattering property by embedded TiO2 scatterers, and the ease of fabrication. Different methods have been employed to analyze diffuse reflectors, including Monte Carlo method, N-flux method, and a one-dimensional approximation based on semi-coherent optics, and the calculated reflectance is around 80% by these methods. In this work, rigorous wave optics solution is used, and it is shown that the reflectance for diffuse medium mirrors can actually be as high as >99% over a broad spectral range, provided the TiO2 scatterer geometry is properly optimized. The bandwidth of diffuse reflectors is un-achievable by other dielectric mirrors such as distributed Bragg reflectors or high index contrast grating mirror, using the same index contrast. Finally, it is promisingly found that even if the distribution of TiO2 is random, the wide-band reflection can still be achieved for the optimized TiO2 geometry. Initial experimental result is included in the supplementary material which shows the high feasibility of diffuse medium mirrors for solar cells. (C) 2014 AIP Publishing LLC.
URI: http://dx.doi.org/10.1063/1.4872140
http://hdl.handle.net/11536/24229
ISSN: 0021-8979
DOI: 10.1063/1.4872140
期刊: JOURNAL OF APPLIED PHYSICS
Volume: 115
Issue: 15
結束頁: 
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