Speaker: Mark Hersam, Department of Materials Science and Engineering, Northwestern University
Abstract: Layered two-dimensional (2D) materials interact primarily via van der Waals bonding, which has created 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. Furthermore, chemical functionalization provides additional opportunities for tailoring the properties of 2D materials and the degree of coupling across heterointerfaces. In this manner, a variety of optoelectronic and energy applications can be enhanced including photodetectors, optical emitters, supercapacitors, and batteries [2-4]. Furthermore, mixed-dimensional heterostructures enable unprecedented electronic device function to be realized that exploit neuromorphic, opto-spintronic, and quantum phenomena [5-8]. 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.
References
[1] S. Hadke, et al., Chemical Reviews, 125, 835 (2025).
[2] M. I. B. Utama, et al., Nature Communications, 14, 2193 (2023).
[3] S. V. Rangnekar, et al., ACS Nano, 17, 17516 (2023).
[4] L. E. Chaney, et al., Advanced Materials, 37, 2305161 (2024).
[5] X. Yan, et al., Nature Electronics, 6, 862 (2023).
[6] H. Liu, et al., Nature Electronics, 7, 876 (2024).
[7] J. T. Gish, et al., Nature Electronics, 7, 336 (2024).
[8] X. Yan, et al., Nature, 624, 551 (2023).