{"id":9708,"date":"2013-11-24T21:13:01","date_gmt":"2013-11-25T03:13:01","guid":{"rendered":"https:\/\/uwm.edu\/news\/?p=9708"},"modified":"2015-11-12T08:01:39","modified_gmt":"2015-11-12T14:01:39","slug":"getting-a-grip-on-graphene","status":"publish","type":"post","link":"https:\/\/uwm.edu\/news\/getting-a-grip-on-graphene\/","title":{"rendered":"Getting a grip on graphene"},"content":{"rendered":"
\"\"<\/a>
Doctoral student Shivani Rajput, first author on the paper, shows a reconstructed image of graphene with the ripples clearly visible. Two postdoctoral researchers also worked on the project: Yaoyi Li (left) from the Weinert lab and Mingxing Chen from the Li lab. (UWM Photo by Troye Fox<\/em>)<\/figcaption><\/figure>\n

For all the promise of graphene as a material for next-generation electronics and quantum computing, scientists still don\u2019t know enough about this high-performance conductor to effectively control an electric current.<\/p>\n

Graphene, a one-atom-thick layer of carbon, conducts electricity so efficiently that the electrons are difficult to control. And control will be necessary before this wonder material can be used to make nanoscale transistors or other devices.<\/p>\n

A new study by a research group at the University of Wisconsin-Milwaukee (UWM) will help. The group has identified new characteristics of electron transport in a two-dimensional sheet of graphene layered on top of a semiconductor.<\/p>\n

The researchers demonstrated that when electrons are rerouted at the interface of the graphene and its semiconducting substrate, they encounter what\u2019s known as a Schottky barrier. If it\u2019s deep enough, electrons don\u2019t pass, unless rectified by applying an electric field \u2013 a promising mechanism for turning a graphene-based device on and off.<\/p>\n

The group also found, however, another feature of graphene that affects the height of the barrier. Intrinsic ripples form on graphene when it is placed on top of a semiconductor.<\/p>\n

The research group, led by Lian Li and Michael Weinert, UWM professors of physics, and Li\u2019s graduate student Shivani Rajput, conducted their experiment with the semiconductor silicon carbide. The results were published in the Nov. 21 issue of Nature Communications<\/em>.<\/p>\n

The ripples are analogous to the waviness of a sheet of paper that has been wetted and then dried. Except in this case, notes Weinert, the thickness of the sheet is less than one nanometer (a billionth of a meter)..<\/p>\n

\u201cOur study says that ripples affect the barrier height and even if there\u2019s a small variation in it, the results will be a large change in the electron transport,\u201d says Li.<\/p>\n

The barrier needs to be the same height across the whole sheet in order to ensure that the current is either on or off, he adds.<\/p>\n

\u201cThis is a cautionary tale,\u201d says Weinert, whose calculations provided the theoretical analysis. \u201cIf you\u2019re going to use graphene for electronics, you will encounter this phenomenon that you will have to engineer around.\u201d<\/p>\n

With multiple conditions affecting the barrier, more work is necessary to determine which semiconductors would be best suited to use for engineering a transistor with graphene.<\/p>\n

The work also presents opportunity. The ability to control the conditions impacting the barrier will allow conduction in three dimensions, rather than along a simple plane. This 3D conduction will be necessary for scientists to create more complicated nano-devices, says Weinert.<\/p>\n

Other contributors on the paper include Mingxing Chen, postdoctoral researcher working with Weinert, Yaoyi Li and Ying Liu, postdoctoral researchers in the Li lab (Liu is now at the Institute\u00a0for Quantum Computing in Waterloo, Canada.)<\/p>\n

See the paper at: http:\/\/www.nature.com\/ncomms\/2013\/131121\/ncomms3752\/full\/ncomms3752.html<\/a><\/p>\n

 <\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

A UWM research group has identified new characteristics in a sheet of graphene layered on top of a semiconductor.<\/p>\n","protected":false},"author":836,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","uwm_wg_additional_authors":[]},"categories":[175],"tags":[],"section":[],"display_categories":[],"related-coverage":[],"uwmnews-feed":[],"class_list":["post-9708","post","type-post","status-publish","format-standard","hentry","category-research"],"yoast_head":"\nGetting a grip on graphene<\/title>\n<meta name=\"description\" content=\"A UWM research group has identified new characteristics in a sheet of graphene layered on top of a semiconductor.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/uwm.edu\/news\/getting-a-grip-on-graphene\/\" \/>\n<meta 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