Image by Matt From London via Flickr
Using ordinary sunlight he’s getting 44% efficiency
A new discovery from a chemist at the University of Texas at Austin may allow photovoltaic solar cells to double their efficiency, thus providing loads more electrical power from regular sunlight.
Not only that, but it’s way cheap. Chemistry professor Xiaoyang Zhu and his team discovered that an organic plastic semiconductor could double the number of electrons harvested out of one photon of sunlight. Yep, plastic.
An issue with regular photovoltaic panels is that much of the energy delivered by sunlight comes in the form of “hot” electrons, which are too high-energy to be converted to electricity in silicon and are instead lost as heat. For that reason, the max insolation-to-electricity efficiency of a silicon solar cell used today is considered to be about 31%. Capturing those hot electrons could boost it to 66%.
Zhu’s process involves absorbing the photon of sunlight in a plastic – in his experiments, pentacene – to produce a dark quantum “shadow state” from which two electrons can be retrieved, instead of just one.
Right now, his experiments use ordinary sunlight, and not focused sunlight, and he’s getting 44% efficiency. That’s a big boost in electricity, and it means it could be done with ordinary rooftop panels.
Breakthroughs in the solar industry seem to be coming fast of late. Just two weeks ago we heard about researcher Douglas Keszlar at Oregon State University in Corvallis, who is studying the photovoltaic potential of fool’s gold– pyrite – and discovered instead that some more ordinary materials could make improved photovoltaics, especially iron silicon sulfide. Once again, the advantage would be that it’s hyperefficient and cheap.
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