Design of van der Waals interfaces for broad-spectrum optoelectronics

Ubrig, Nicolas; Ponomarev, Evgeniy; Zultak, Johanna; Domaretskiy, Daniil; Z�lyomi, Viktor; Terry, Daniel; Howarth, James; Guti�rrez-Lezama, Ignacio; Zhukov, Alexander; Kudrynskyi, Zakhar R.; Kovalyuk, Zakhar D; Patan�, Amalia; Taniguchi, Takashi; Watanabe, Kenji; Gorbachev, Roman V; Fal'ko, Vladimir I; Morpurgo, Alberto F

Abstract

Van der Waals (vdW) interfaces based on 2D materials are promising for optoelectronics, as interlayer transitions between different compounds allow tailoring of the spectral response over a broad range. However, issues such as lattice mismatch or a small misalignment of the constituent layers can drastically suppress electron–photon coupling for these interlayer transitions. Here, we engineered type-II interfaces by assembling atomically thin crystals that have the bottom of the conduction band and the top of the valence band at the Γ point, and thus avoid any momentum mismatch. We found that these van der Waals interfaces exhibit radiative optical transitions irrespective of the lattice constant, the rotational and/or translational alignment of the two layers or whether the constituent materials are direct or indirect gap semiconductors. Being robust and of general validity, our results broaden the scope of future optoelectronics device applications based on two-dimensional materials.

Citation

Ubrig, N., Ponomarev, E., Zultak, J., Domaretskiy, D., Zólyomi, V., Terry, D., …Morpurgo, A. F. (2020). Design of van der Waals interfaces for broad-spectrum optoelectronics. Nature Materials, 19, 299-304. https://doi.org/10.1038/s41563-019-0601-3

• Journal Article Type: Article
• Acceptance Date: Dec 20, 2019
• Online Publication Date: Feb 3, 2020
• Publication Date: 2020-03
• Deposit Date: Jan 6, 2020
• Publicly Available Date: Aug 4, 2020
• Journal: Nature Materials
• Print ISSN: 1476-1122
• Electronic ISSN: 1476-4660
• Publisher: Nature Publishing Group
• Peer Reviewed: Peer Reviewed
• Volume: 19
• Pages: 299-304
• DOI: https://doi.org/10.1038/s41563-019-0601-3
• Keywords: Mechanical Engineering; General Materials Science; Mechanics of Materials; General Chemistry; Condensed Matter Physics
• Public URL: https://nottingham-repository.worktribe.com/output/3676205
• Publisher URL: https://www.nature.com/articles/s41563-019-0601-3