SnSe2 field-effect transistors with high drive current

Yang Su, Mona A. Ebrish, Eric J. Olson, Steven J. Koester

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SnSe2 field-effect transistors fabricated using mechanical exfoliation are reported. Substrate-gated devices with source-to-drain spacing of 0.5 μm have been fabricated with drive current of 160 μA/μm at T = 300 K. The transconductance at a drain-to-source voltage of Vds = 2 V increases from 0.94 μS/μm at 300 K to 4.0 μS/μm at 4.4 K, while the field-effect mobility increases from 8.6 cm2/Vs at 300 K to 28 cm2/Vs at 77 K. The conductance at Vds = 50 mV shows an activation energy of only 5.5 meV, indicating the absence of a significant Schottky barrier at the source and drain contacts.

Original languageEnglish (US)
Article number263104
JournalApplied Physics Letters
Issue number26
StatePublished - Dec 23 2013

Bibliographical note

Funding Information:
The authors would like to acknowledge the support of the National Science Foundation (NSF) under grant No. ECCS-1102278. Parts of this work were carried out in the Characterization Facility, University of Minnesota, which receives partial support from NSF through the MRSEC program.

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