19 February 2015 Photonic crystal based on anti-reflection structure for GaN/InGaN heterojunction solar cells
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Proceedings Volume 9449, The International Conference on Photonics and Optical Engineering (icPOE 2014); 94491L (2015) https://doi.org/10.1117/12.2081345
Event: The International Conference on Photonics and Optical Engineering and the Annual West China Photonics Conference (icPOE 2014), 2014, Xi'an, China
Abstract
The III-V nitride material such as InGaN has many favorable physical properties including a wide direct band-gap (0.7- 3.4eV), high absorption coefficients (105 cm-1), and high radiation resistance. As such, InGaN has been chosen as an excellent material for full-solar-spectrum photovoltaic applications utilizing its wide and tunable band-gap. The refractive index of GaN is about 2.5 in the full-solar-spectrum. According to the Fresnel formula, there is a high reflection of ~18.4% as the sun light entering GaN. Anti-reflection films could be used on InGaN/GaN solar cell to decrease the reflection loss. The photonic crystal structure is a kind of anti-reflection based on the effective medium theory without any limitations, for example the mismatched thermal expansion coefficient. In this paper, we reported our research work on the design and fabrication of photonic crystal structure on the surface of GaN. FDTD Solutions is used to simulate the reflectivity on the surface of GaN with hexagonal close-packed pillar which has different period-a, diameter-d and height-h. When the parameters a is 500nm, d is 300nm, the reflectivity reached the lowest point of 4.18%. The self-assembly method was used to fabricate the photonic crystal structure on the GaN surface and the fabrication process was also researched. The photonic crystal structures on the surface of p-GaN were obtained and their characteristics of the antireflective film will be discussed in detail.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Wen Ding, Wen Ding, Deyang Xia, Deyang Xia, Qiang Li, Qiang Li, Yaping Huang, Yaping Huang, Min Zheng, Min Zheng, Linzhao Zhang, Linzhao Zhang, Jin Wang, Jin Wang, Ye Zhang, Ye Zhang, Maofeng Guo, Maofeng Guo, Shuo Liu, Shuo Liu, Xilin Su, Xilin Su, Feng Yun, Feng Yun, Xun Hou, Xun Hou, } "Photonic crystal based on anti-reflection structure for GaN/InGaN heterojunction solar cells", Proc. SPIE 9449, The International Conference on Photonics and Optical Engineering (icPOE 2014), 94491L (19 February 2015); doi: 10.1117/12.2081345; https://doi.org/10.1117/12.2081345
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