PdSe 2 : Pentagonal Two-Dimensional Layers with High Air Stability for Electronics

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…

• UD
  U.S. Department of Energy

  Awards: AC05-00OR22725, DE-SC0002136, DE-AC05, 00OR22725
• B
  Battelle

  Awards: DE-AC05, DE-AC05-00OR22725
• UO
  University of Tennessee
• U
  UT-Battelle

  Awards: DE-AC05-, AC05-00OR22725
• OO
  Office of Science
• OR
  Oak Ridge National Laboratory