Solar power research is a big deal. Scientists have been searching for a way to improve photovoltaic efficacy for years by developing new technologies – from giant solar concentrator arrays to satellites that beam power back to Earth. Now, Stanford University researchers have developed what they call the thinnest, most efficient photovoltaic wafers ever. Instead of increasing the size of the solar arrays, the researchers created solar wafers with a nano-sized structure that is 1,000 times thinner than any other commercially available thin-film solar cell absorbers.
According to the researchers, the thin film solar wafers are only 1.6 nanometers thin, which cuts down on materials required to produce the cells while making them lighter. At the same time, all of this was done without comprising the solar cells’ ability to absorb visible light. These smaller photovoltaic cells can actually absorb parts of the visible light spectrum with incredible efficiency.
“The coated wafers absorbed 99 percent of the reddish-orange light,” Carl Hagglund, postdoctoral scholar at Department of Chemical Engineering and lead author on the study, said in a statement. “We also achieved 93 percent [light] absorption in the gold nanodots themselves.”