GAINESVILLE, Fla. — Doping may be a no-no for athletes, but researchers in the University of Florida’s physics department say it was key in getting unprecedented power conversion efficiency from a new graphene solar cell created in their lab.
Graphene solar cells are one of industry’s great hopes for cheaper, durable solar power cells in the future. But previous attempts to use graphene, a single-atom-thick honeycomb lattice of carbon atoms, in solar cells have only managed power conversion efficiencies ranging up to 2.9 percent. The UF team was able to achieve a record breaking 8.6 percent efficiency with their device by chemically treating, or doping, the graphene with trifluoromethanesulfonyl-amide, or TFSA. Their results are published in the current online edition of Nano Letters.
“The dopant makes the graphene film more conductive and increases the electric field potential inside the cell,” said Xiaochang Miao, a graduate student in the physics department. That makes it more efficient at converting sunlight into electricity. And unlike other dopants that have been tried in the past, TFSA is stable — its effects are long lasting.
“Graphene, unlike conventional metals, is transparent and flexible, so it has great potential to be an important component in the kind of solar cells we hope to see incorporated into building exteriors and other materials in the future,” said Arthur Hebard, distinguished professor of physics at UF and co-author on the paper. “Showing that its power-converting capabilities can be enhanced by such a simple, inexpensive treatment bodes well for its future.”
The researchers said that if graphene solar cells reach 10 percent power conversion efficiency they could be a contender in the market place, if production costs are kept low enough.
The prototype solar cell created in the UF lab was built on a rigid base of silicon, which is not considered an economical material for mass production. But Hebard said that he sees real possibilities for combining the use of doped graphene with less expensive, more flexible substrates like the polymer sheets currently under development in research laboratories around the world. -30-
Credits Writer Donna Hesterman, email@example.com, 352-846-2573 Source Arthur Hebard, firstname.lastname@example.org, 352-222-6212 Source Xiaochang Miao, email@example.com, 352-871-4116