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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41324

Title: Achieving graded refractive index by use of ZnO nanorods/TiO2 layer to enhance omnidirectional photovoltaic performances of InGaP/GaAs/Ge triple-junction solar cells
Authors: Meng-Tsan Tsai
Zu-Po Yang
Ting-Shiuan Jing
Hsin-Hwa Hsieh
Yung-Chi Yao
Tai-Yuan Lin
Yang-Fang Chen
Ya-Ju Lee
Contributors: 國立臺灣海洋大學:光電科學研究所
Keywords: Antireflection coating
Zinc oxide (ZnO)
Nanorod
Triple-junction solar cell
Date: 2015
Issue Date: 2017-02-14T06:22:14Z
Publisher: Solar Energy Materials and Solar Cells
Abstract: Abstract: In this study, we theoretically and experimentally demonstrate high performance of antireflection (AR) coating composed of the ZnO nanorods (NRs) and TiO2 layers applied on InGaP/GaAs/Ge triple-junction solar cells. The high performance of this AR coating is due to the realization of a smooth gradient profile of refractive index fabricated by only two physical layers. First, due to the inherent inhomogeneous-nanoporous geometry along the surface normal, the ZnO NRs are reasonable to be considered as discrete multiple optical layers with low scattering loss, leading to the index smoothly increasing from air ambient toward down to the solar cells. Second, to compensate the gap of index between ZnO and solar cells, an additional TiO2 layer with index in between is hence necessary to insert under ZnO NRs, significantly further reducing the Fresnel reflection loss of the entire device. The ZnO NRs/ TiO2 layer shows a low wavelength-averaged (solar spectrum weighted) reflectance of 6.00% (4.78%) over a wide spectral range of λ=380–1800 nm, and exhibits a hydrophobic surface with a water contact angle of 128.2°. At device level, we compared the photovoltaic performance of solar cells with and without AR coating, the short-circuit density (JSC) is enhanced by 31.8% and 23.8% for solar cells integrated with the ZnO NRs/TiO2 layer and conventional SiO2/TiO2 double-layer AR (DLAR) coating, respectively. Under a very large incident angle of solar illumination (θ=80°), the ZnO NRs/TiO2 layer remains static with JSC enhancement of 35.2%, whereas the JSC enhancement of conventional DLAR coating drops down to 9.4%. In addition, the ZnO NRs/TiO2 layer barely affects the open-circuit voltage and fill factor of the solar device. Therefore, the proposed ZnO NRs/TiO2 layer with a smoother graded refractive index change is highly promising for the AR coating applications for the next-generation solar cells.
Relation: 136
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41324
Appears in Collections:[光電科學研究所] 期刊論文

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