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The National Renewable Energy Laboratory announced that scientists have produced a six-junction solar cell with an efficiency of 47.1% measured under concentrated lighting, thus setting a new world record.
The National Renewable Energy Laboratory also pointed out that the efficiency of the same battery under a single solar exposure was recorded at 39.2%.
This work was funded by the US Department of Energy's Office of Solar Energy Technology and described in a new paper in the journal Natural Energy. John Geisz is the first author. The latter is the chief scientist of the high-efficiency crystal photovoltaic group of the National Renewable Energy Laboratory.
Researchers on this project used III-V materials with broad light absorption properties to make batteries with six junctions or photosensitive layers, each designed to capture light in a specific part of the solar spectrum.
Ryan France, co-author and scientist of the National Renewable Energy Laboratory III-V multi-junction group, pointed out that III-V solar cells are most commonly used to power satellites due to their high manufacturing cost, and on the earth, such batteries are very good. Suitable for concentrating photovoltaics.
Ryan France says "One way to reduce the cost is to reduce the area required. You can use a mirror to capture the light and focus it to a point. Compared with a flat silicon battery, you can get rid of one percent or even one thousandth. One material. By concentrating light, you can use less semiconductor material. Another advantage is that when you concentrate light, efficiency increases. "
Ryan France said that the efficiency of this battery is more than 50% "actually achievable." John Geisz commented that to do this, it is necessary to reduce the resistive barriers inside the battery that hinder the flow of current.
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