Sponsor
This work was partially supported by the National Science Foundation (NSF) under Award ECCS-1944095, the New York State Energy Research and Development Authority (NYSERDA) under Award 138126, and the New York State Center of Excellence in Materials Informatics (CMI) under Award C160186.
Published In
Nanoscale
Document Type
Article
Publication Date
4-2020
Subjects
Nanoelectronic devices, Transition metals -- Effect on carrier transport, Semiconductors -- Design and construction, Semiconductors -- Materials
Abstract
High contact resistance is one of the primary concerns for electronic device applications of two-dimensional (2D) layered semiconductors. Here, we explore the enhanced carrier transport through metal–semiconductor interfaces in WS2 field effect transistors (FETs) by introducing a typical transition metal, Cu, with two different doping strategies: (i) a “generalized” Cu doping by using randomly distributed Cu atoms along the channel and (ii) a “localized” Cu doping by adapting an ultrathin Cu layer at the metal–semiconductor interface. Compared to the pristine WS2 FETs, both the generalized Cu atomic dopant and localized Cu contact decoration can provide a Schottky-to-Ohmic contact transition owing to the reduced contact resistances by 1–3 orders of magnitude, and consequently elevate electron mobilities by 5–7 times. Our work demonstrates that the introduction of transition metal can be an efficient and reliable technique to enhance the carrier transport and device performance in 2D TMD FETs.
DOI
10.1039/D0NR01573C
Persistent Identifier
https://archives.pdx.edu/ds/psu/33677
Citation Details
Liu, M., Wei, S., Shahi, S., Jaiswal, H. N., Paletti, P., Fathipour, S., ... & Li, H. (2020). Enhanced carrier transport by transition metal doping in WS 2 field effect transistors. Nanoscale. https://doi.org/10.1039/D0NR01573C
Description
© The Royal Society of Chemistry 2020
This is the authors' version of an article which susequently appeared in Nanoscale, 2020 (12), published by the Royal Society of Chemistry. May be accessed at https://doi.org/10.1039/D0NR01573C.