University of Massachusetts Amherst

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Two-dimensional Crystals and Nano-scale Devices

Wenjuan Zhu
Research Staff Member
IBM T.J. Watson Research Center

Date and Time: 

April 7, 2014 - 11:00am to 12:00pm

Location: 

Kellogg Room, Elab II

Host: 

Qiangfei Xia

Contact the host: 

In the last few years, the research community has seen rapidly growing interest in two-dimensional (2D) crystals and their applications. The electronic properties of these 2D crystals are diverse — ranging from semi-metals, such as graphene, to semiconductors, such as MoS2, to insulators, such as boron nitride. These 2D crystals have many unique properties as compared to their bulk counterparts due to their reduced dimensionality and symmetry. A key difference is the band structures, which lead to distinct electronic and photonic properties. The 2D nature of the materials also plays an important role in defining their exceptional properties of mechanical strength, surface sensitivity, thermal conductivity, tunable band-gap and interaction with light. These unique properties of 2D crystals open up broad territories of applications in computing, communication, energy, and medicine. In this talk, I will present my work on understanding the electrical properties of graphene and MoS2, in particular current transport and band-gap engineering in graphene, interface between gate dielectrics and graphene, and gap states in MoS2. I will also present our work on the nano-scale electronic devices (RF and logic devices) and photonic devices (plasmonic devices and photo-detectors) based on these 2D crystals.

Bio: 

Wenjuan Zhu is a Research Staff Member in Nanoscience & Nanotechnology Group at the IBM T. J. Watson Research Center.  Dr. Zhu received her Ph.D. degree in the Department of Electrical Engineering at Yale University in 2003. Her thesis was focused on high-k gate dielectrics for CMOS applications. After graduation, she joined IBM Semiconductor Research and Development Center. She made key contributions to the 65nm and 32nm CMOS technology nodes. In 2008, she joined the IBM T. J. Watson Research Center and worked on 2D materials including graphene and layered transition metal dichalcogenides (LTMD).  Research in the past has resulted in 49 publications in journals and conference proceedings, 22 patent applications, and numerous presentations in conferences. Dr. Zhu received Outstanding Technical Achievement Award in IBM, more than ten Invention Achievement Award in IBM, Henry Prentiss Becton Graduate Prize for exceptional achievement in research in Engineering and Applied Science at Yale University, and IEEE SISC Ed Nicollican Award for Best Student Paper.