Getting the blues is rarely a desirable experience -- unless you're a solar cell, that is.
Scientists at the
Most simple solar cells handle these bluish hues of the electromagnetic spectrum inefficiently. This is because blue photons -- incoming particles of light that strike the solar cell -- actually have excess energy that a conventional solar cell can't capture.
"Photons of different energies kick electrons up by different amounts," said
Because of this limitation, scientists had originally believed that simple solar cells would never be able to convert more than about 34 percent of incoming solar radiation to electricity. However, about a decade ago, researchers saw the potential for a single high-energy photon to stimulate multiple "excitons" (pairs of an electron and a positively-charged partner called a "hole") instead of just one. "This was a very exciting discovery, but we were still skeptical that we could get the electrons out of the material," Korgel said.
In their study, Korgel and his team used specialized spectroscopic equipment at
In order to deposit thin films of the nanocrystalline material, the researchers used a process known as "photonic curing," which involves the split-second heating up and cooling down of the top layer of the material. This curing process not only prevents the melting of the glass that contains the nanocrystals, but also vaporizes organic molecules that inhibit multiple exciton extraction.
Although the study mostly proves that the efficiency boost provided by multiple exciton extraction is possible in mass-producible materials, the major hurdle will be to incorporate these materials into actual real-world devices.
"The holy grail of our research is not necessarily to boost efficiencies as high as they can theoretically go, but rather to combine increases in efficiency to the kind of large-scale roll-to-roll printing or processing technologies that will help us drive down costs," Korgel said.
A paper based on the study recently appeared in the
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