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Fedorov, A., Praveen, C. S., Verbitskiy, N. I., Haberer, D., Usachov, D., Vyalikh, D. V., Nefedov, A., Woll, C., Petaccia, L., Piccinin, S., Sachdev, H., Knupfer, M., Buchner, B., Fabris, S. and Gruneis, A. (2015). Efficient gating of epitaxial boron nitride monolayers by substrate functionalization. Physical review B, 92 (12). APS Physics. ISSN 2469-9969

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Abstract

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.

Item Type:	Article
Creators:	Creators Email ORCID ORCID Put Code Fedorov, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Praveen, C. S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Verbitskiy, N. I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Haberer, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Usachov, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Vyalikh, D. V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nefedov, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Woll, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Petaccia, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Piccinin, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sachdev, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Knupfer, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Buchner, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fabris, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gruneis, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-81470
Identification Number:	10.1103/PhysRevB.92.125440
Journal or Publication Title:	Physical review B
Volume:	92
Number:	12
Date:	15 September 2015
Publisher:	APS Physics
ISSN:	2469-9969
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II
Subjects:	Natural sciences and mathematics Physics
Funders:	European Community FP7 CALIPSO (Grant No. 312284) Transnational Access Program, NanoCF, ERC Grant No. 648589 - SUPER-2D, Russian Science Foundation (Grant No. 14-13-00747), Ministry of Education and Science of the Russian Federation (Grant No. 14.585.21.0004), Austrian Science Fund (FWF), Project No. I 377-N16, Theory and spectroscopy on functionalized graphene, Science and Technology of Nanosystems programme (Project No. 431103- Molecular Building Blocks/Supramolecular Networks), MIUR PRIN, Grant No. 20105ZZTSE, Saint-Petersburg State University Grant No. 11.37.634.2013, BMBF (Grant No. 05K12OD3), RFBR (Grant No. 14-02-31150)
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/8147