
The team found that while a wider band gap works well for sunlight, the light of Proxima Centauri would require a narrow band gap. For example, a simulated wide band gap solar cell has a theoretical efficiency of 18.9% for sunlight, but only 0.9% for Proxima Centauri
Solar panels generate an electric voltage through what is known as the photoelectric effect. Modern solar panels can harness not just ultraviolet light, but also visible and in some cases infrared. But most exoplanets orbit red dwarf stars, which have a peak brightness in the red or infrared and emit little ultraviolet
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