MSE Fall Seminar Series: Jeehwan Kim, Massachusetts Institute of Technology

Description

"Artificial heterostructures enabled by stacking single-crystalline freestanding membranes"

Jeehwan Kim

Jeehwan Kim, Massachusetts Institute of Technology

Professor Jeehwan Kim is an Associate Professor of Massachusetts Institute of Technology in the Mechanical engineering and Materials Science and Engineering. He is a Principal Investigator in Research Laboratory of Electronics at MIT. Prof. Kim's group focuses on innovation in nanotechnology for next generation computing and electronics. Before joining MIT in 2015, he was a Research Staff Member at IBM T.J. Watson Research Center in Yorktown Heights, NY since 2008. Many of his patents have been licensed for commercialization. Prof. Kim is a recipient of 20 IBM high value invention achievement awards. In 2012, he was appointed a “Master Inventor” of IBM in recognition of his active intellectual property generation and commercialization of his research. He is a recipient of DARPA Young Faculty Award and DARPA director’s Award. He is an inventor of > 200 issued/pending US patents and an author of > 50 articles in peer-reviewed journals. 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. 

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 [1-3]. 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 [4,5].

[1] Y. Kim, et al, and J. Kim, “Remote epitaxy through graphene enables two-dimensional material based layer transfer” Nature, Vol. 544, 340 (2017)

[2] W. Kong, et al, and J. Kim, “Polarity govern atomic interaction through two-dimensional materials”, Nature Materials, Vol. 17, 999 (2018)

[3] S. Bae et al, and J. Kim, “Graphene-assisted spontaneous relaxation towards dislocation-free heteroepitaxy”, Nature Nanotechnology Vol. 15, 272-276 (2020)

[4] S. Bae, et al, and J. Kim, “Integration of bulk materials with two-dimensional materials for physical coupling and applications”, Vol. 18, 550–560 Nature Materials (2019)

[5] H. Kum, et al., and J. Kim, “Heterogeneous integration of single-crystalline complex-oxide membranes, Nature, Vol 578, 75-81 (2020)