High-performance solution-based silicon heterojunction solar cells using carbon nanotube with polymeric acid doping
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Anti-reflective coating
The preparation of silica antireflective coatings through sol-gel process is discussed, involving the composition of coating solution and ageing time, and then the optimal condition of the sol for preparation of antireflective coatings is given. The films are characterized with AFM, spectrophotometer and ellipsometer respectively. The experimental results show that there is a relationship between the antireflective effect and the preparation conditions.
Anti-reflective coating
Ellipsometry
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The increased use of low quality multi-crystalline silicon (mc-Si) for photovoltaic applications requires an adaption of the solar cell fabrication processes to that material. In the present work, we demonstrate that slow cooling after a high temperature process can lead to a decrease of the dissolved impurity concentration within the wafer and thus, to an increase of the electron lifetime. A decrease of the interstitial iron concentration of more than 97% has been observed. Correspondingly, a lifetime enhancement of up to 120% in comparison to the initial electron lifetime has been found. Especially low lifetime areas on mc-Si wafers seem to be affected by these temperature treatments. This makes slow cooling a promising tool to engineer the wafer quality during the solar cell fabrication process, especially for very low quality materials.
Carrier lifetime
Wafer fabrication
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Recently, required performance levels of antireflective coatings are becoming higher in technical fields of camera lens. We succeeded in forming antireflective coatings with ultra-low refractive index layers and achieving superior performances by sol-gel method.
Anti-reflective coating
Visible spectrum
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Abstract : This article carries out analyses of errors associated with two layer antireflective coatings. It points out that two layer antireflective coatings associated with non lambda/4 stacks have more stable optical properties than lambda 4 stacks. Using Ta2O5 and SiO2 to act as film materials, two layer antireflective coatings were prepared on Kg glass substrate. The single surface reflectivity was below 0.03%, and laser damage threshold values were greater than 7 GW/sq cm (laser light wave length 1.06 micron, pulse width 1 ns). jg
Anti-reflective coating
Optical coating
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Recently, required performance levels of antireflective coatings are becoming higher in technical fields of camera lens. We succeeded in forming antireflective coatings with ultra-low refractive index layers and achieving superior performances by sol-gel method.
Anti-reflective coating
Visible spectrum
Optical coating
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Anti-reflective coating
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Abstract A ZnO nanorod antireflective coating has been prepared on Cu(In,Ga)Se 2 thin film solar cells. This coating leads to a decrease of the weighted global reflectance of the solar cells from 8.6 to 3.5%. It boosts the solar cells short‐circuit current up to 5.7% without significant effect on their open‐circuit voltage and fill factor (FF), which is comparable to a conventional optimized single layer MgF 2 antireflective coating. The ZnO nanorod antireflective coating was electrochemically prepared from an aqueous solution at 80°C. The antireflective capability of ZnO nanorod arrays (ZNAs) may be further improved by optimization of growth conditions and their geometry. Copyright © 2010 John Wiley & Sons, Ltd.
Anti-reflective coating
Nanorod
Open-circuit voltage
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Antireflective coatings on sapphire were optimized by variation of the coating design, the total thickness and the highly refractive material used. The coatings were characterized with a focus on their mechanical properties.
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A new type of low cost Si heteroface solar cell having a construction of SnO2/p+ -p Si has been developed. Fabrication processes are much simpler than the ordinary p-n homojunction solar cell with very high conversion efficiency of 12.9%. SnO5 layer acts as not only a heterojunction window but also a low resistance contact and an antireflective coating. Optimum design of this type solar cell has also been investigated, and discussed with the experimental data.
Homojunction
Anti-reflective coating
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Anti-reflective coating
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