[phas-dept] "Mixed-dimensional heterostructures for electronic and energy technologies" - YouTube presentation for this week colloquium

[Heungman Park]

Dear all in Physics and Astronomy,



We have a YouTube presentation for the colloquium this week.

We do not meet on Thursday this week.



“Mixed-dimensional heterostructures for electronic and energy technologies”
https://www.youtube.com/watch?v=8y1A_0vZHro
MIT.nano Seminar Series: Mark Hersam

Prof. Mark Hersam, the Walter P. Murphy Professor of Materials Science and Engineering at Northwestern University, delivered the September 2023 MIT.nano seminar on mixed-dimensional heterostructures for electronic and energy technologies.

ABSTRACT
Layered two-dimensional (2D) materials interact primarily via van der Waals bonding, which has created new opportunities for heterostructures that are not constrained by epitaxial lattice matching requirements [1]. However, since any passivated, dangling bond-free surface interacts with another via non-covalent forces, van der Waals heterostructures are not limited to 2D materials alone. In particular, 2D materials can be integrated with a diverse range of other materials, including those of different dimensionality, to form mixed-dimensional van der Waals heterostructures [2]. Furthermore, chemical functionalization provides additional opportunities for tailoring the properties of 2D materials [3] and the degree of coupling across heterointerfaces [4].

In this manner, a variety of optoelectronic and energy applications can be enhanced including photodetectors, optical emitters, supercapacitors, and batteries [5-7]. Furthermore, mixed-dimensional heterostructures enable unprecedented electronic device function to be realized including anti-ambipolar transistors, gate-tunable Gaussian heterojunction transistors, and neuromorphic memtransistors [8,9].

In addition to technological implications for electronic and energy technologies, this talk will explore several fundamental issues including band alignment, doping, trap states, and charge/energy transfer across mixed-dimensional heterointerfaces.

[1]    D. Lam, et al., ACS Nano, 16, 7144 (2022).
[2]    S. Padgaonkar, et al., Accounts of Chemical Research, 53, 763 (2020).
[3]    M. I. B. Utama, et al., Nature Communications, 14, 2193 (2023).
[4]    S. H. Amsterdam, et al., Journal of the American Chemical Society, 143, 17153 (2021).
[5]    D. Lam, et al., ACS Nano, 16, 11315 (2022).
[6]    K.-Y. Park, et al., Advanced Materials, 34, 2106402 (2022).
[7]    L. Kuo, et al., Advanced Materials, 34, 2203772 (2022).
[8]    V. K. Sangwan and M. C. Hersam, Nature Nanotechnology, 15, 517 (2020).
[9]    X. Yan, et al., Advanced Materials, 34, 2108025 (2022).


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