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Taking a New Look at Carbon Nanotubes

By Guest PostDecember 7, 2013Scienceactin filaments, advancing nanotube technology, anisotropic, berkeley lab, carbon nanotubes, crystal, Environment, feng wang, functional device, fused silica substrate, graphene nanoribbons, human hair, kaihui liu, molecule, na, nanobiomaterials, nanorods, numerical aperture, optical anisotropy, plethora, polarization, semiconductor nanowires, species, substrates, xiaoping hong

Berkeley Researchers Develop Technique For Imaging Individual Carbon Nanotubes

Despite their almost incomprehensibly small size – a diameter about one ten-thousandth the thickness of a human hair – single-walled carbon nanotubes come in a plethora of different “species,” each with its own structure and unique combination of electronic and optical properties. Characterizing the structure and properties of an individual carbon nanotube has involved a lot of guesswork – until now.

Researchers with the U.S. Department of Energy (DOE)’s Lawrence Berkeley National Laboratory (Berkeley Lab) and the University of California (UC) Berkeley have developed a technique that can be used to identify the structure of an individual carbon nanotube and characterize its electronic and optical properties in a functional device. (more…)

Photovoltaics from Any Semiconductor

By Guest PostJuly 29, 2012Sciencealex zettl, berkeley lab, cadmium telluride, coins, copper oxide, crystals of silicon, electric field, electrical current, feng wang, metal oxides, non-toxic, onur ergen, p n junctions, phosphides, photovoltaics, renewable energy, semiconductor, sfpv, solar cells, solar energy, steven byrnes, sulfides, will gannett, william regan

Berkeley Lab Technology Could Open Door to More Widespread Solar Energy Devices

A technology that would enable low-cost, high efficiency solar cells to be made from virtually any semiconductor material has been developed by researchers with the U.S. Department of Energy (DOE)’s Lawrence Berkeley National Laboratory (Berkeley Lab) and the University of California (UC) Berkeley. This technology opens the door to the use of plentiful, relatively inexpensive semiconductors, such as the promising metal oxides, sulfides and phosphides, that have been considered unsuitable for solar cells because it is so difficult to tailor their properties by chemical means.

“It’s time we put bad materials to good use,” says physicist Alex Zettl, who led this research along with colleague Feng Wang. “Our technology allows us to sidestep the difficulty in chemically tailoring many earth abundant, non-toxic semiconductors and instead tailor these materials simply by applying an electric field.” (more…)

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Taking a New Look at Carbon Nanotubes

Photovoltaics from Any Semiconductor