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Three generations of photovoltaic glass antireflection film technology comparison chart
(Left) Antireflection film cross-section photograph with closed pore structure (right) Anti-fog self-cleaning properties
(Left) Antireflection film refractive index modulation (right) of the three-layer wide-spectrum quasi-gradient antireflection film and single-layer antireflection film from 1.10-1.45
The large-area multi-functional high-efficiency antireflection film technology has received extensive attention in recent years. The first-generation porous silica and second-generation double-layer oxide anti-reflection film technology for photovoltaic glass developed by the photovoltaic technology research group of the Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences [J. Appl. Phys. 112, 093517 (2012); Sol. Energy 89, 134 (2013); CN201010150748, CN200910098519] has achieved industrial application. The problem that the above system still has to be improved is that since the film has an open pore structure in direct communication with the air, moisture and other impurities in the air are easily adsorbed, resulting in a decline in optical performance.
Based on previous research, the relevant team aims to improve the optical properties, weather resistance and mechanical properties of the anti-reflection film. Through theoretical calculations and experimental verification, we explored ways to realize the new anti-reflection coating.
Currently, the team is working on the third generation of nanometer wide-spectrum antireflection coatings with closed pores. The single-layer antireflection film has a spectrally weighted average transmittance of 97.34% at the wavelength of 300-1200 nm, which is close to the theoretical limit of 97.72%. This system also has a significant anti-fog effect. Based on this, a more complex multi-layer quasi-graded photovoltaic anti-reflection film was realized by the refractive index control technology (between 1.10-1.45), which further improved the broad spectrum anti-reflection effect while achieving better Weather resistance. Some relevant research results were recently published on ACS Appl. Mater. Interfaces 6, 1415 (2014) and J. Sol-gel Sci. Technol. DOI: 10.1007/s10971-014-3364-y, and have been authorized Chinese invention patents ( CN20120097416). This progress has laid a solid foundation for further improving the broad spectrum, omnidirectional and long-term antireflection properties of anti-reflection coatings and their application in photovoltaic and optoelectronic devices.
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