New Dopants may Improve PV glass Performance

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The doping with these compounds is said to reduce the UV transmission while also keeping the glass free from absorption in the visible and near-infrared ranges.

In the paper Towards improved cover glasses for photovoltaic devices, published in Progress in Photovoltaics, the researchers stressed that it is crucial for glass improvement to reduce the concentration of iron oxide species within the glass front sheet, while also providing sufficient absorption of UV photons to protect the ethylene-vinyl acetate co-polymer encapsulants used for solar module lamination. This solution has a double positive effect, as the doped glass absorbs harmful UV photons while also re‐emitting some of this absorbed energy as photons of visible light that can be captured and converted by the solar cell, they further explained.

The doping with these two compounds reduces the UV transmission while also keeping the glass free from absorption in the visible and near-infrared ranges. “This is augmented by broadband down‐shifting of absorbed UV photons and re‐emission as visible photons available for conversion by the solar cell,” the researchers concluded. The researchers noted that 3 mm is commonly considered the minimum thickness, and that a 2 mm or thinner toughened glass can also be achieved with an improved process, in which the rollers are replaced by gas flotation systems in the furnace.

IMAGE SOURCE : PV MAGAZINE