Focused helium-ion beam irradiation effects on electrical transport properties of few-layer WSe<sub>2</sub> [electronic resource] : Enabling nanoscale direct write homo-junctions

Published:: Washington, D.C. : United States. Dept. of Energy. Office of Science, 2016.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description:: Article numbers 27,276 : digital, PDF file
Additional Creators:: Oak Ridge National Laboratory, United States. Department of Energy. Office of Science, and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

Atomically thin transition metal dichalcogenides (TMDs) are currently receiving significant attention due to their promising opto-electronic properties. Tuning optical and electrical properties of mono and few-layer TMDs, such as tungsten diselenide (WSe₂), by controlling the defects, is an intriguing opportunity to synthesize next generation two dimensional material opto-electronic devices. Here, we report the effects of focused helium ion beam irradiation on the structural, optical and electrical properties of few-layer WSe₂, via high resolution scanning transmission electron microscopy, Raman spectroscopy, and electrical transport measurements. By controlling the ion irradiation dose, we selectively introduce precise defects in few-layer WSe₂ thereby locally tuning the resistivity and transport properties of the material. Hole transport in the few layer WSe₂ is degraded more severely relative to electron transport after helium ion irradiation. Moreover, by selectively exposing material with the ion beam, we demonstrate a simple yet highly tunable method to create lateral homo-junctions in few layer WSe₂ flakes, which constitutes an important advance towards two dimensional opto-electronic devices.

Report Numbers:

E 1.99:1261537

Subject(s):

Materials Science

Note:

Published through SciTech Connect.
06/06/2016.
"KC0202020"
"ERKCS80"
Scientific Reports 6 6 ISSN 2045-2322 AM
Michael Stanford; Joo Hyon Noh; Michael R. Koehler; David G. Mandrus; Gerd Duscher; Adam Justin Rondinone; Ilia N. Ivanov; Thomas Zac Ward; Philip D. Rack; Pushpa Raj Pudasaini; Alex Belianinov; Nicholas Cross.

Funding Information:

AC05-00OR22725

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