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Colloquium | Materials Science Division

Artificial heterostructures enabled by stacking single-crystalline freestanding membranes

MSD Colloquium

Abstract: While 2D heterostructures promise interesting futuristic devices, the performance of 2D material-based devices is substantially inferior to that of conventional 3D semiconductor materials. However, 3D materials exist as their bulk form, thus it is challenging to stack them together for heterostructures.

My group at MIT has recently invented a 2D materials-based layer transfer (2DLT) technique that can produce single-crystalline freestanding membranes from any compound materials with their excellent semiconducting performance. This technique is based on remote epitaxy of single-crystalline films on graphene-coated substrates, where the epitaxial registry occurs from the substrate through graphene and the remote epitaxial films are peeled from slippery graphene. Stacking of those freestanding 3D material membranes enables unprecedented artificial heterostructures whose performance is expected to be superior to that of 2D heterostructures. I will talk about our group’s effort to apply single-crystalline freestanding membranes for flexible, conformal electronics as well as for 3D heterostructures.

Bio: Professor Jeehwan Kim is an Associate Professor of Massachusetts Institute of Technology in the Mechanical engineering and Materials Science and Engineering. He received his B.S. from Hongik University, his M.S. from Seoul National University, and his Ph.D. from UCLA in 2008, all of them in Materials Science.