Environmentally Controlled Charge Carrier Injection Mechanisms of Metal/WS 2 Junctions

Rik Van Bremen*, Kevin Vonk, Harold J.W. Zandvliet, Pantelis Bampoulis

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

11 Citations (Scopus)
169 Downloads (Pure)


Here we report on a novel, noninvasive route for operando tailoring of the charge transport properties of metal/WS 2 contacts without the negative impacts to two-dimensional materials arising from conventional doping methods. The doping level of thin WS 2 flakes supported on insulating mica is susceptible to local charge variations induced by the presence of a hydration layer between mica and WS 2 . 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/WS 2 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.

Original languageEnglish
Pages (from-to)2578-2584
Number of pages7
JournalThe journal of physical chemistry letters
Issue number10
Publication statusPublished - 16 May 2019


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