Gainesville, FL--Researchers in the University of Florida's (UF) physics department say that doping was key in getting unprecedented power conversion efficiency (PCE) from a new graphene solar cell created in their lab. Although previous attempts to use graphene--a single-atom-thick honeycomb lattice of carbon atoms--in solar cells have only managed PCE values up to 2.9%, the UF team was able to achieve a record breaking 8.6% with their device by doping the graphene device with trifluoromethanesulfonyl-amide, or TFSA. Their results are published in the 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.
When graphene and silicon come together, they form a Schottky junction and when illuminated with light, act as a power conversion zone for an entire class of solar cells. Schottky junctions are commonly formed by layering a metal on top of a semiconductor. But researchers at the UF Nanoscience Institute for Medical and Engineering Technologies discovered in 2011 that graphene, a semi-metal, made a suitable substitute for metal in creating the junction.
"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 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.
SOURCE: University of Florida;http://news.ufl.edu/2012/05/24/solar-efficiency/