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Making electrical contact along 1-D edge of 2-D materials
Date:10/31/2013

nitride crystals. To do this, they employed a new technique in which the top boron nitride crystal was used to sequentially pick up the other layers in the stack. "This technique completely eliminated any contamination between layers," Professor Dean noted.

Once they created the stack, they etched it to expose the edge of the graphene layer. Then they evaporated metal onto the edge to create the electrical contact. By making contact along the edge, the team realized a 1D interface between the 2D active layer and 3D metal electrode.

Even though electrons entered only at the 1D atomic edge of the graphene sheet, the contact resistance was remarkably low, reaching 100 ohms per micron of contact widtha value smaller than what is typically achieved for contacts at the graphene top surface.

Continuing their collaboration, the team is now working on applying these techniques to develop new hybrid materials by mechanical assembly and edge contact. They plan to draw from the full suite of available 2D layered materials, including graphene, boron nitride, transition metal dichalcogenides (TMDCs), transition metal oxides (TMOs), and topological insulators (TIs).

"With so much current research focused on developing new devices by integrating layered 2D systems, potential applications are incredible, from vertically structured transistors, tunneling based devices and sensors, photoactive hybrid materials, to flexible and transparent electronics," added Professor Hone.


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Contact: Ellis Simon
esimon@ccny.cuny.edu
212-650-6460
City College of New York
Source:Eurekalert

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