Devices, Nanofunctions, and Unconventional Applications of 2D Materials

  • Authors:
    Eric Pop (Stanford)
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    2385.004 (Stanford University)


Two-dimensional (2D) materials have unusual and anisotropic electrical and thermal properties. This talk will present recent highlights from our atoms-to-systems research on graphene, BN, and transition metal dichalcogenides (TMDs).

We have studied graphene from basic transport measurements and simulations, to the recent wafer-scale demonstration of analog dot product nanofunctions for neural networks [1]. We are also growing and evaluating the electrical and thermal properties of TMDs including MoS2, HfSe2, and WTe2 [2,3]. Recent results include low-resistance contacts [4], 10-nm scale transistors, and high-field transport studies including velocity saturation. We have also examined the anisotropic thermal conductivity of these materials, for unconventional applications to thermal switches and thermal routing. If time permits, I will discuss “bottom up” thermal management starting at dimensions comparable to the electron and phonon mean free paths (~100 nm), where quasi-ballistic heat flow effects dominate [5].

Our studies reveal fundamental limits and new applications that could be achieved through the co-design and heterogeneous integration of 2D nanomaterials.

[1] N.C. Wang, S.K. Gonugondla, I. Nahlus, N.R. Shanbhag, E. Pop, "GDOT: A Graphene-Based Nanofunction for Dot-Product Computation," IEEE VLSI Tech. Symp., Jun 2016, Honolulu HI

[2] K.K.H. Smithe, C.D. English, S.V. Suryavanshi, E. Pop, "Enhanced Electrical Transport and Performance Projections of Synthetic Monolayer MoS2 Devices," arXiv:1608.00987 (2016)

[3] M.J. Mleczko, R.L. Xu, K. Okabe, H.-H. Kuo, I.R. Fisher, H.-S.P. Wong, Y. Nishi, E. Pop, "High Current Density and Low Thermal Conductivity of Atomically Thin Semimetallic WTe2," ACS Nano 10, 7507-7514 (2016)

[4] C.D. English, G. Shine, V.E. Dorgan, K.C. Saraswat, E. Pop, "Improved Contacts to MoS2 Transistors by Ultra-High Vacuum Metal Deposition," Nano Lett. 16, 3824-3820 (2016)

[5] M.-H. Bae, Z. Li, Z. Aksamija, P.N. Martin, F. Xiong, Z.-Y. Ong, I. Knezevic, E. Pop, "Ballistic to Diffusive Crossover of Heat Flow in Graphene Ribbons," Nature Comm. 4, 1734 (2013)

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