Universität zu Köln

Schroeder, Ulrike A., Petrovic, Marin ORCID: 0000-0002-2234-1207, Gerber, Timm, Martinez-Galera, Antonio J., Granaes, Elin, Arman, Mohammad A., Herbig, Charlotte, Schnadt, Joachim ORCID: 0000-0001-9375-831X, Kralj, Marko ORCID: 0000-0002-9786-3130, Knudsen, Jan and Michely, Thomas ORCID: 0000-0003-1657-1847 (2017). Core level shifts of intercalated graphene. 2D Mater., 4 (1). BRISTOL: IOP PUBLISHING LTD. ISSN 2053-1583

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Abstract

Through intercalation of metals and gases the Dirac cone of graphene on Ir(111) can be shifted with respect to the Fermi level without becoming destroyed by strong hybridization. Here, we use x-ray photoelectron spectroscopy to measure the C 1s core level shift. (CLS) of graphene in contact with a number of structurally well-defined intercalation layers (O, H, Eu, and Cs). By analysis of our own and additional literature data for decoupled graphene, the C 1s CLS is found to be a non-monotonic function of the doping level. For small doping levels the shifts are well described by a rigid band model. However, at larger doping levels, a second effect comes into play which is proportional to the transferred charge and counteracts the rigid band shift. Moreover, not only the position, but also the C 1s peak shape displays a unique evolution as a function of doping level. Our conclusions are supported by intercalation experiments with Li, with which, due to the absence of phase separation, the doping level of graphene can be continuously tuned.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Schroeder, Ulrike A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Petrovic, Marin UNSPECIFIED orcid.org/0000-0002-2234-1207 UNSPECIFIED Gerber, Timm UNSPECIFIED UNSPECIFIED UNSPECIFIED Martinez-Galera, Antonio J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Granaes, Elin UNSPECIFIED UNSPECIFIED UNSPECIFIED Arman, Mohammad A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Herbig, Charlotte UNSPECIFIED UNSPECIFIED UNSPECIFIED Schnadt, Joachim UNSPECIFIED orcid.org/0000-0001-9375-831X UNSPECIFIED Kralj, Marko UNSPECIFIED orcid.org/0000-0002-9786-3130 UNSPECIFIED Knudsen, Jan UNSPECIFIED UNSPECIFIED UNSPECIFIED Michely, Thomas UNSPECIFIED orcid.org/0000-0003-1657-1847 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-238732
DOI:	10.1088/2053-1583/4/1/015013
Journal or Publication Title:	2D Mater.
Volume:	4
Number:	1
Date:	2017
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	2053-1583
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language EPITAXIAL GRAPHENE; SUBMONOLAYER POTASSIUM; LITHIUM-GRAPHITE; BAND-GAP; X-RAY; LI; OXYGEN; IR(111); ADSORPTION; STATES Multiple languages Materials Science, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/23873