Efficient gating of epitaxial boron nitride monolayers by substrate functionalization

Autor(en)

A. Fedorov, C. S. Praveen, N. I. Verbitskiy, D. Haberer, D. Usachov, D. V. Vyalikh, A. Nefedov, C. Wöll, L. Petaccia, S. Piccinin, H. Sachdev, M. Knupfer, B. Büchner, S. Fabris, Alexander Grüneis

Abstrakt

Insulating hexagonal boron nitride monolayers (hBN) are best known for being resistant to chemical functionalization. This property makes hBN an excellent substrate for graphene heterostructures, but limits its application as an active element in nanoelectronics where tunable electronic properties are needed. Moreover, the two-dimensional-materials' community wishes to learn more about the adsorption and intercalation characteristics of alkali metals on hBN, which have direct relevance to several electrochemistry experiments that are envisioned with layered materials. Here we provide results on ionic functionalization of hBN/metal interfaces with K and Li dopants. By combining angle-resolved photoemission spectroscopy (ARPES), x-ray photoelectron spectroscopy, and density functional theory calculations, we show that the metallic substrate readily ionizes the alkali dopants and exposes hBN to large electric fields and band-energy shifts. In particular, if hBN is in between the negatively charged substrate and the positive alkali ion, this allows us to directly study, using ARPES, the effects of large electric fields on the electron energy bands of hBN.

Organisation(en)

Elektronische Materialeigenschaften

Externe Organisation(en)

Saint Petersburg State University, Scuola Internazionale Superiore di Studi Avanzati, Universität zu Köln, Lomonosov Moscow State University (MSU), University of California, Berkeley, Technische Universität Dresden, Karlsruher Institut für Technologie, Elettra Sincrotrone Trieste, Max-Planck-Institut für Polymerforschung, Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden

Journal

Physical Review B

Band

92

Anzahl der Seiten

7

ISSN

1098-0121

DOI

https://doi.org/10.1103/PhysRevB.92.125440

Publikationsdatum

09-2015

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Schlagwörter

ASJC Scopus Sachgebiete

Electronic, Optical and Magnetic Materials, Condensed Matter Physics

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/960334bd-1731-46a1-8fd8-a16e75cf41d1