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The way a color is obtained, and how it affects the performance of a PV panel, therefore strongly depends on the specific technology used and the optical phenomena taking place. “Ideally, a colored PV panel should be able to reflect only a narrow band of the visible spectrum and transmit all the rest,” Valckenborg explained.
Just a few years ago, it it was thought that power yield could be up to 50% lower than conventional panels, but tests have shown a difference of just 10%. Valckenborg says that losses can vary depending on the color of a panel. Colored modules being tested at the SolarBEAT test field.
The quality of silicon matters a lot. Monocrystalline silicon, known for efficiency, makes panels look dark black. Polycrystalline silicon, a bit less efficient, gives panels a unique blue look. Different colors mean different ways panels handle light and energy. Color impacts how well solar panels turn light into energy.
A row of colored modules at the SolarBEAT facility. There are currently two main approaches to coloring PV panels: a technique consisting of pigment-based coloration, and a structural coloration method. The first technique refers to the application of dyes and pigments that mainly absorb and partially reflect specific parts of the spectrum.
“When we want a colored PV panel, we have to accept that not all the visible solar spectrum will be transmitted to the cell, but part of it will be reflected or absorbed,” he stated.
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