PdSe2: Pentagonal Two-Dimensional Layers with High Air Stability for Electronics

Oyedele, Akinola D.; Yang, Shize; Liang, Liangbo; Puretzky, Alexander A.; Wang, Kai; Zhang, Jingjie; Yu, Peng; Pudasaini, Pushpa R.; Ghosh, Avik W.; Liu, Zheng; Rouleau, Christopher M.; Sumpter, Bobby G.; Chisholm, Matthew F.; Zhou, Wu; Rack, Philip D.; Geohegan, David B.; Xiao, Kai

doi:10.1021/jacs.7b04865

Title: PdSe₂: Pentagonal Two-Dimensional Layers with High Air Stability for Electronics

Journal Article · Tue Sep 05 00:00:00 EDT 2017 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/jacs.7b04865· OSTI ID:1394440

Oyedele, Akinola D. ^[1];

^[2];

^[2]; Wang, Kai ^[2]; Zhang, Jingjie ^[3]; Yu, Peng ^[4]; Pudasaini, Pushpa R. ^[5]; Ghosh, Avik W. ^[6]; Liu, Zheng ^[4];

^[2];

^[7];

^[2];

^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Virginia, Charlottesville, VA (United States)
Nayang Technologal Univ. (Singapore)
Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Virginia, Charlottesville, VA (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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 PdSe₂, 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 PdSe₂ were identified using polarized Raman spectroscopy, and the strong interlayer interaction was revealed from the large thickness-dependent Raman peak shifts, agreeing with first-principles Raman simulations. Field-effect transistors made from the few-layer PdSe₂ display tunable ambipolar charge carrier conduction with a high electron apparent field-effect mobility of ~158 cm²V^-1s^-1, indicating the promise of this anisotropic, air-stable, pentagonal 2D material for 2D electronics.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1394440

Journal Information:: Journal of the American Chemical Society, Vol. 139, Issue 40; ISSN 0002-7863

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 393 works

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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mobility

Title: PdSe2: Pentagonal Two-Dimensional Layers with High Air Stability for Electronics

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Title: PdSe₂: Pentagonal Two-Dimensional Layers with High Air Stability for Electronics