Type

Journal Article

Authors

Farzan Gity
Paul K. Hurley
Georg S Duesberg
Roger E. Nagle
Enrico Caruso
Ray Duffy
Gioele Mirabelli
Kevin F. Burke
Tanja Stimpel-Lindner
Rita Siris
and 6 others

Subjects

Physics

Topics
confinement induced semimetal to semiconductor ptse2 electronic devices two dimensional materials density functional theory calculations quantum confinment evolution complementary metal oxide semiconductor

Quantum confinement-induced semimetal-to-semiconductor evolution in large-area ultra-thin PtSe2 films grown at 400 °C (2019)

Abstract In this work, we present a comprehensive theoretical and experimental study of quantum confinement in layered platinum diselenide (PtSe2) films as a function of film thickness. Our electrical measurements, in combination with density functional theory calculations, show distinct layer-dependent semimetal-to-semiconductor evolution in PtSe2 films, and highlight the importance of including van der Waals interactions, Green’s function calibration, and screened Coulomb interactions in the determination of the thickness-dependent PtSe2 energy gap. Large-area PtSe2 films of varying thickness (2.5–6.5 nm) were formed at 400 °C by thermally assisted conversion of ultra-thin platinum films on Si/SiO2 substrates. The PtSe2 films exhibit p-type semiconducting behavior with hole mobility values up to 13 cm2/V·s. Metal-oxide-semiconductor field-effect transistors have been fabricated using the grown PtSe2 films and a gate field-controlled switching performance with an ION/IOFF ratio of >230 has been measured at room temperature for a 2.5–3 nm PtSe2 film, while the ratio drops to <2 for 5–6.5 nm-thick PtSe2 films, consistent with a semiconducting-to-semimetallic transition with increasing PtSe2 film thickness. These experimental observations indicate that the low-temperature growth of semimetallic or semiconducting PtSe2 could be integrated into the back-end-of-line of a silicon complementary metal-oxide-semiconductor process.
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Full list of authors on original publication

Farzan Gity, Paul K. Hurley, Georg S Duesberg, Roger E. Nagle, Enrico Caruso, Ray Duffy, Gioele Mirabelli, Kevin F. Burke, Tanja Stimpel-Lindner, Rita Siris and 6 others

Experts in our system

1
Farzan Gity
University College Cork
Total Publications: 26
 
2
Paul K. Hurley
University College Cork
Total Publications: 78
 
3
Georg Duesberg
Trinity College Dublin
Total Publications: 116
 
4
Roger E. Nagle
University College Cork
Total Publications: 5
 
5
Enrico Caruso
University College Cork
Total Publications: 9
 
6
Ray Duffy
University College Cork
Total Publications: 33
 
7
Gioele Mirabelli
University College Cork
Total Publications: 15