Tri-layer antireflection coatings (SiO2/SiO2–TiO2/TiO2) for silicon solar cells using a sol–gel technique |
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| Authors: | Shui-Yang Lien Dong-Sing Wuu Wen-Chang Yeh Jun-Chin Liu |
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| Affiliation: | aDepartment of Materials Engineering, National Chung Hsing University, 250 Kuo Kuang Road, Taichung 402, Taiwan, Republic of China;bDepartment of Electronic Engineering, National Taiwan University of Science & Technoogy, Taipei 106, Taiwan, Republic of China;cIndustrial Technology Research Institute, Photovoltaic and Optical Materials Research Laboratory, Chutung, Taiwan 310, Republic of China |
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| Abstract: | Antireflection coatings (ARCs) have become one of the key issues for mass production of Si solar cells. They are generally performed by vacuum processes such as thermal evaporation, reactive sputtering, and plasma-enhanced chemical vapor deposition. In this work, a sol–gel method has been demonstrated to prepare the ARCs for the non-textured monocrystalline Si solar cells. The spin-coated TiO2 single-layer, SiO2/TiO2 double-layer and SiO2/SiO2–TiO2/TiO2 triple-layer ARCs were deposited on the Si solar cells and they showed good uniformity in thickness. The measured average optical reflectance (400–1000 nm) was about 9.3, 6.2 and 3.2% for the single-layer, double-layer and triple-layer ARCs, respectively. Good correlation between theoretical and experimental data was obtained. Under a triple-layer ARC condition, a 39% improvement in the efficiency of the monocrystalline Si solar cell was achieved. These indicate that the sol–gel ARC process has high potential for low-cost solar cell fabrication. |
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| Keywords: | silicon antireflection coating sol– gel TiO2 SiO2 solar cell |
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