28 October

What Are 2D Materials Good For?

Thursday 28 October 2021, 04:00pm

Zoom webinar

ONLINE EVENT -  Register HERE to attend

By: Prof. Eric Pop, Electrical Engineering, Materials Science & Engineering, and SystemX Alliance Stanford University, Stanford, USA

Abstract: This talk will present my (admittedly biased) perspective of what two-dimensional (2D) materials could be good for. For example, they may be good for applications where their ultrathin nature and lack of dangling bonds give them distinct advantages, such as flexible electronics [1] or DNA-sorting nanopores [2]. They may not be good for applications where conventional materials work well, like in transistors thicker than a few nanometers. I will focus on the case of 2D materials for 3D heterogeneous integration of electronics, which presents significant advantages for energy-efficient computing [3]. In this context, 2D materials could be monolayer transistors with ultralow leakage [4] (taking advantage of larger band gaps than silicon), used as access devices for high-density data storage [5]. For example, recent results from our group have shown monolayer transistors with record performance [6,7], which cannot be achieved with sub-nanometer thin conventional semiconductors. I will also describe some less conventional applications, using 2D materials as highly efficient thermal insulators [8] and as thermal transistors [9]. These could enable control of heat in “thermal circuits” analogous with electrical circuits. Combined, these studies reveal fundamental limits and some unusual applications of 2D materials, which take advantage of their unique properties.

References:[1] A. Daus et al., Nature Elec. 4, 495 (2021). [2] J. Shim et al. Nanoscale 9, 14836 (2017). [3] M. Aly et al., Computer 48, 24 (2015). [4] C. Bailey et al., EMC (2019). [5] A. Khan et al. Science 373, 1243 (2021). [6] C. English et al., IEDM, Dec 2016. [7] C. McClellan et al. ACS Nano 15, 1587 (2021). [8] S. Vaziri et al., Science Adv. 5, eaax1325 (2019). [9] A. Sood et al. Nature Comm. 9, 4510 (2018).

Introductory talk: "Anisotropic thermal conductivity of layered 2D SnSe2" by Dr Emigdio Chávez, Senior Postdoctoral Researcher at Phononic and Photonic Nanostructures Group at ICN2