@article{318d5bcb23af45739165804415ad58e7,
title = "One dimensional metallic edges in atomically thin WSe2 induced by air exposure",
abstract = "Transition metal dichalcogenides are a unique class of layered two-dimensional (2D) crystals with extensive promising applications. Tuning the electronic properties of low-dimensional materials is vital for engineering new functionalities. Surface oxidation is of particular interest because it is a relatively simple method of functionalization. By means of scanning probe microscopy and x-ray photoelectron spectroscopy, we report the observation of metallic edges in atomically thin WSe2 monolayers grown by chemical vapor deposition on epitaxial graphene. Scanning tunneling microscopy shows structural details of WSe2 edges and scanning tunneling spectroscopy reveals the metallic nature of the oxidized edges. Photoemission demonstrates that the formation of metallic sub-stoichiometric tungsten oxide (WO2.7) is responsible for the high conductivity measured along the edges. Ab initio calculations validate the susceptibility of WSe2 nanoribbon edges to oxidation. The zigzag terminated edge exhibits metallic behavior prior the air-exposure and remains metallic after oxidation. Comprehending and exploiting this property opens a new opportunity for application in advanced electronic devices.",
author = "Rafik Addou and Smyth, {Christopher M.} and Noh, {Ji Young} and Lin, {Yu Chuan} and Yi Pan and Eichfeld, {Sarah M.} and Stefan F{\"o}lsch and Robinson, {Joshua A.} and Kyeongjae Cho and Feenstra, {Randall M.} and Wallace, {Robert M.}",
note = "Funding Information: The authors thank Prof Christopher Hinkle (UT-Dallas), Prof Andrew Kummel (UC-San Diego), and Dr Luigi Colombo (Texas Instruments) for useful discussions. This work is supported in part by the Center for Low Energy Systems Technology (LEAST), one of six centers supported by the STARnet phase of the Focus Center Research Program (FCRP), a Semiconductor Research Corporation program sponsored by MARCO and DARPA.It is also supported by the SWAN Center, a SRC center sponsored by the Nanoelectronics Research Initiative and NIST. JN was supported by National Research Foundation of Korea by Creative Materials Discovery Program (2015M3D1A1068062). CMS was also supported in part by NSF Award No. 1407765 under the US/Ireland UNITE collaboration. Funding Information: This work is supported in part by the Center for Low Energy Systems Technology (LEAST), one of six centers supported by the STARnet phase of the Focus Center Research Program (FCRP), a Semiconductor Research Corporation program sponsored by MARCO and DARPA. It is also supported by the SWAN Center, a SRC center sponsored by the Nanoelectronics Research Initiative and NIST. JN was supported by National Research Foundation of Korea by Creative Materials Discovery Program (2015M3D1A1068062). CMS was also supported in part by NSF Award No. 1407765 under the US/Ireland UNITE collaboration. Publisher Copyright: {\textcopyright} 2018 IOP Publishing Ltd.",
year = "2018",
month = mar,
day = "8",
doi = "10.1088/2053-1583/aab0cd",
language = "English (US)",
volume = "5",
journal = "2D Materials",
issn = "2053-1583",
publisher = "IOP Publishing Ltd.",
number = "2",
}