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article imageNew advancement with graphene

By Tim Sandle     Sep 7, 2014 in Science
Scientists have reported the first experimental observation of ultra-fast charge transfer in grapehene based semiconductors. The recorded charge transfer time was under 50 femtoseconds. This sounds fast, but was does it mean?
For a start, this is incredibly fast. A femtosecond is one millionth of one billionth of a second. Furthermore, the super fast time is comparable to the fastest ever times recorded for photovoltaics. Photovoltaics describes a method of generating electrical power by converting solar radiation into direct current electricity.
With the semiconductor study, researchers are searching for charge transfer times of less than 50 femtoseconds. Achieving this ultra-quick time with graphene based technology should lead to advancements with semiconductors. Semiconductors are the foundation of modern electronics, including transistors, solar cells, light-emitting diodes (LEDs), quantum dots and digital and analog integrated circuits. Improving the speed that semiconductors work seen by technologists as key to the development of next generation electronic devices.
The newly designed semiconductors feature the same hexagonal “honeycombed” structure as graphene and superfast electrical conductance. Graphene, a subject regularly featured in Digital Journal's science pages, is considered the new "wonder material," due its durability and lightness,as well as its conductive abilities. Graphene can be described as a one-atom thick layer of graphite.
The study was an international collaboration of researchers led by a scientist with the U.S. Department of Energy (DOE)’s Lawrence Berkeley National Laboratory (Berkeley Lab). The research has been published in Nature Nanotechnology, in a study titled “Ultrafast charge transfer in atomically thin MoS2/WS2 heterostructures”.
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