The Advanced Photon Source
a U.S. Department of Energy Office of Science User Facility

NST Colloquium: Mixed-Dimensional Heterostructures for Electronic and Energy Technologies

Type Of Event
Colloquium
Location
Hybrid: 440/A105-A106 and Virtual
Building Number
440
Room Number
A105-A106
Speaker
Mark Hersam, Northwestern University
Host
Nathan Guisinger
Start Date
02-15-2023
Start Time
11:00 a.m.
Description

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 van der Waals heterointerfaces. 

 [1]  D. Lam, et al., ACS Nano, 16, 7144 (2022). 

[2]  D. Jariwala, et al., Nature Materials, 16, 170 (2017). 

[3]  S. H. Amsterdam, et al., Journal of Physical Chemistry Letters, 12, 4543 (2021). 

[4]  S. Padgaonkar, et al., Accounts of Chemical Research, 53, 763 (2020). 

[5]  D. Lam, et al., ACS Nano, 16, 11315 (2022). 

[6]  K.-Y. Park, et al., Advanced Materials, 34, 2106402 (2022). 

[7]  N. S. Luu, et al., Accounts of Materials Research, 3, 511 (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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