PdSe<sub>2</sub>: Pentagonal Two-Dimensional Layers
with High Air Stability for Electronics
Akinola
D. Oyedele
Shize Yang
Liangbo Liang
Alexander A. Puretzky
Kai Wang
Jingjie Zhang
Peng Yu
Pushpa R. Pudasaini
Avik W. Ghosh
Zheng Liu
Christopher M. Rouleau
Bobby G. Sumpter
Matthew F. Chisholm
Wu Zhou
Philip D. Rack
David B. Geohegan
Kai Xiao
10.1021/jacs.7b04865.s001
https://acs.figshare.com/articles/journal_contribution/PdSe_sub_2_sub_Pentagonal_Two-Dimensional_Layers_with_High_Air_Stability_for_Electronics/5445187
Most
studied two-dimensional (2D) materials exhibit isotropic behavior
due to high lattice symmetry; however, lower-symmetry 2D materials
such as phosphorene and other elemental 2D materials exhibit very
interesting anisotropic properties. In this work, we report the atomic
structure, electronic properties, and vibrational modes of few-layered
PdSe<sub>2</sub> exfoliated from bulk crystals, a pentagonal 2D layered
noble transition metal dichalcogenide with a puckered morphology that
is air-stable. Micro-absorption optical spectroscopy and first-principles
calculations reveal a wide band gap variation in this material from
0 (bulk) to 1.3 eV (monolayer). The Raman-active vibrational modes
of PdSe<sub>2</sub> were identified using polarized Raman spectroscopy,
and a strong interlayer interaction was revealed from large, thickness-dependent
Raman peak shifts, agreeing with first-principles Raman simulations.
Field-effect transistors made from the few-layer PdSe<sub>2</sub> display
tunable ambipolar charge carrier conduction with a high electron field-effect
mobility of ∼158 cm<sup>2</sup> V<sup>–1</sup> s<sup>–1</sup>, indicating the promise of this anisotropic, air-stable,
pentagonal 2D material for 2D electronics.
2017-09-05 00:00:00
2 D materials exhibit
transition metal dichalcogenide
thickness-dependent Raman peak shifts
lower-symmetry 2 D materials
band gap variation
few-layer PdSe 2 display tunable ambipolar charge carrier conduction
2 D electronics
few-layered PdSe 2 exfoliated
first-principles Raman simulations
anisotropic
High Air Stability
air-stable
bulk
electron field-effect mobility
Raman-active vibrational modes
spectroscopy
pentagonal 2 D
pentagonal 2 D material
Pentagonal Two-Dimensional Layers
PdSe 2