Does anyone know a thin layer coating (probably multi layers) that gives >97% transmission when coated on glass?
In principle every element which can be coated onto glass can fulfill this depending on the coating thickness. you have to specify at least a wavelength or photon energy for which the 97% transmission should be achieved.
What is the targeted application? solar cells?
Yes, targeted application is solar cells and the transmission should be above 97% for the entire range from 300 to 1100nm wavelength. My question is: does anyone know a coatable material(s) on glass to achieve these specs? This can be a combination of several layers. I need to find out what materials and what approximate thicknesses for each layer. As thickness increases absorption increases as well I think.
It is not even the application but the main function of the coating - why do you need it at all? If transmission was the only function, you better leave your glass simply uncoated.
Plasma RD center has several multi layer selective PVD coatings on glass , Cu, Al, Stainless steel tubes and plates.
The coatings transform solar spectrum in heat translate heat through multilayer coating to substrate.
Maximum absorbance which we received is 96% and minimum emissivity is around 5%.
Very important characteristic is thermal stability in normal and vacuum atmosphere.
Different coatings has different stability.
Our coatings are stable to 300 C or more .
Maximum stability in out side atmosphere which we received is 500 Celsius degree.
A lot of combinations are possible: based on Ti, TiNOx, based on TiAl Nitrides,
Very important is infrared layer from Cu or Al to reduce emisivity.
My answer was related to PVD selective coatings.
The best transparency we received with PVD SiO2 coating .
Glas has already 96% transmision in visible range. higher transmission using Coating films or AR can be obtained for selective wavelength only.
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