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

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

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Abstract

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
JournalJournal of physical chemistry letters
Volume10
Issue number10
DOIs
Publication statusPublished - 16 May 2019

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carrier injection
flakes
Mica
mica
Charge carriers
charge carriers
Metals
routes
Doping (additives)
Charge injection
Water
Hydration
metals
Transport properties
water
hydration
Charge transfer
Multilayers
Electronic equipment
switches

Keywords

  • UT-Hybrid-D

Cite this

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abstract = "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.",
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Environmentally Controlled Charge Carrier Injection Mechanisms of Metal/WS 2 Junctions. / Van Bremen, Rik; Vonk, Kevin; Zandvliet, Harold J.W.; Bampoulis, Pantelis.

In: Journal of physical chemistry letters, Vol. 10, No. 10, 16.05.2019, p. 2578-2584.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Bampoulis, Pantelis

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AB - 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.

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