Universität zu Köln

van Bremen, Rik, Vonk, Kevin, Zandvliet, Harold J. W. and Bampoulis, Pantelis ORCID: 0000-0002-2347-5223 (2019). Environmentally Controlled Charge Carrier Injection Mechanisms of Metal/WS2 Junctions. J. Phys. Chem. Lett., 10 (10). S. 2578 - 2591. WASHINGTON: AMER CHEMICAL SOC. ISSN 1948-7185

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Abstract

Here we report on a novel, noninvasive route for operando tailoring of the charge transport properties of metal/WS2 contacts without the negative impacts to two-dimensional materials arising from conventional doping methods. The doping level of thin WS2 flakes supported on insulating mica is susceptible to local charge variations induced by the presence of a hydration layer between mica and WS2. We demonstrate, via the use of several complementary scanning probe techniques, that the direct control of the state and thickness of this intercalated water film controls the charge injection properties of Pt/WS2 nanocontacts. A switch from unipolar to ambipolar transport was achieved by environmentally controlling the thickness of the intercalated water. We show that the effect persists even for multilayer flakes and that it is completely reversible, opening a new route toward the realization of novel electronics with environmentally controllable functionalities.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code van Bremen, Rik UNSPECIFIED UNSPECIFIED UNSPECIFIED Vonk, Kevin UNSPECIFIED UNSPECIFIED UNSPECIFIED Zandvliet, Harold J. W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bampoulis, Pantelis UNSPECIFIED orcid.org/0000-0002-2347-5223 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-148142
DOI:	10.1021/acs.jpclett.9b00862
Journal or Publication Title:	J. Phys. Chem. Lett.
Volume:	10
Number:	10
Page Range:	S. 2578 - 2591
Date:	2019
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1948-7185
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TRANSPORT-PROPERTIES; MOS2 TRANSISTORS; MONOLAYER MOS2; WATER; MICA; CONTACTS; MODULATION Multiple languages Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Atomic, Molecular & Chemical Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/14814