Tan Dao

University of New Hampshire



Mentor: Dr. Shawna Hollen,  Department of Physics

The Effects Of Strain And Suspension On The Electronic Properties Of Molybdenum Disulfide

We live in an age where small, lightweight, and strong materials are necessary for our future development of electronics. Two-dimensional materials can fill this need because they are as thin as physically possible and have tunable electronic properties that can be used for development of flexible, faster, and smaller electronic devices. One of the most exciting two-dimensional materials is molybdenum disulfide (MoS2). Single layer MoS2 exhibits a tunable band gap and tunable electrical conductivity when a local strain, stretching between atoms, is induced. The ability to tune bandgap and electrical conductivity is important for making electronics with faster computation speed and lower power consumption. To tune the electronic properties by using strain, we first need to establish a better understanding between strain and electronic properties. For this Mc- Nair summer research, I propose to build on my 2019 spring URA work to characterize the local conductivity in single-to-few layer strained and suspended MoS2 sheets. I will be making MoS2 device on an insulating substrate with nanopatterned valleys and hills by using the Transmission Electron Microscopy (TEM) grids to make micro-electrical connections, and then use conductive atomic force microscopy (C-AFM) to characterize the local electrical conductivity at the nanoscale level. This study will determine whether strain can cause variations in the conductivity and how they are related. The results of this study will help connect the fundamental understanding between mechanical properties and electronic properties, which can be used to develop smaller, faster, and lower energy consumption electronics.


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