Exfoliation of large-area transition metal chalcogenide single layers

Magda, Gábor Zsolt and Pető, János and Dobrik, Gergely and Hwang, Chanyong and Biró, László Péter and Tapasztó, Levente (2015) Exfoliation of large-area transition metal chalcogenide single layers. SCIENTIFIC REPORTS, 5. p. 14714. ISSN 2045-2322


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Isolating large-areas of atomically thin transition metal chalcogenide crystals is an important but challenging task. The mechanical exfoliation technique can provide single layers of the highest structural quality, enabling to study their pristine properties and ultimate device performance. However, a major drawback of the technique is the low yield and small (typically <10 um) lateral size of the produced single layers. Here, we report a novel mechanical exfoliation technique, based on chemically enhanced adhesion, yielding MoS<inf>2</inf>single layers with typical lateral sizes of several hundreds of microns. The idea is to exploit the chemical affinity of the sulfur atoms that can bind more strongly to a gold surface than the neighboring layers of the bulk MoS<inf>2</inf> crystal. Moreover, we found that our exfoliation process is not specific to MoS<inf>2</inf>, but can be generally applied for various layered chalcogenides including selenites and tellurides, providing an easy access to large-area 2D crystals for the whole class of layered transition metal chalcogenides.

Item Type: Article
Subjects: Q Science / természettudomány > QC Physics / fizika
Q Science / természettudomány > QC Physics / fizika > QC04 Electricity. Magnetism. Electromagnetism / villamosság, mágnesesség, elektromágnessesség
Depositing User: MTMT SWORD
Date Deposited: 15 Dec 2015 12:57
Last Modified: 15 Jan 2016 11:03

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