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Title: Novel Pd 2 Se 3 Two-Dimensional Phase Driven by Interlayer Fusion in Layered PdSe 2

Journal Article · · Physical Review Letters
 [1];  [2];  [3];  [3];  [2];  [4]
  1. National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan)
  2. Vanderbilt Univ., Nashville, TN (United States)
  3. Nanyang Technological Univ. (Singapore)
  4. National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan); Univ. of Tokyo (Japan)

Two-dimensional (2D) materials are easily fabricated when their bulk form has a layered structure. The monolayer form in layered transition-metal dichalcogenides is typically the same as a single layer of the bulk material. Yet, PdSe 2 presents a puzzle. Its monolayer form has been theoretically shown to be stable, but there have been no reports that monolayer PdSe 2 has been fabricated. Here, combining atomic-scale imaging in a scanning transmission electron microscope and density functional theory, we show that the preferred monolayer form of this material amounts to a melding of two bulk monolayers accompanied by the emission of Se atoms so that the resulting stoichiometry is Pd 2 Se 3 . We further verify the interlayer melding mechanism by creating Se vacancies in situ in the layered PdSe 2 matrix using electron irradiation. The discovery that strong interlayer interactions can be induced by defects and lead to the formation of new 2D materials opens a new venue for the exploration of defect engineering and novel 2D structures.

Research Organization:
Vanderbilt Univ., Nashville, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-09ER46554
OSTI ID:
1597827
Alternate ID(s):
OSTI ID: 1368626
Journal Information:
Physical Review Letters, Vol. 119, Issue 1; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 104 works
Citation information provided by
Web of Science

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Cited By (15)

Penta-PdX 2 (X = S, Se, Te) monolayers: promising anisotropic thermoelectric materials journal January 2019
Construction of bilayer PdSe2 on epitaxial graphene journal May 2018
Quasiparticle electronic structure and optical spectra of single-layer and bilayer PdSe 2 : Proximity and defect-induced band gap renormalization journal June 2019
Pressure‐Tunable Ambipolar Conduction and Hysteresis in Thin Palladium Diselenide Field Effect Transistors journal May 2019
Two-dimensional PdSe 2 -Pd 2 Se 3 junctions can serve as nanowires journal June 2018
Photoluminescence of PdS 2 and PdSe 2 quantum dots journal January 2019
Recent Progress on 2D Noble‐Transition‐Metal Dichalcogenides journal October 2019
Anomalous interlayer vibrations in strongly coupled layered PdSe 2 journal May 2018
Pd 2 Se 3 monolayer: a novel two-dimensional material with excellent electronic, transport, and optical properties journal January 2018
High‐Performance, Room Temperature, Ultra‐Broadband Photodetectors Based on Air‐Stable PdSe 2 journal April 2019
Striated 2D Lattice with Sub‐nm 1D Etch Channels by Controlled Thermally Induced Phase Transformations of PdSe 2 journal September 2019
Half-metallicity in two-dimensional Co 2 Se 3 monolayer with superior mechanical flexibility journal September 2018
Strategies on Phase Control in Transition Metal Dichalcogenides journal August 2018
Physical Properties and Photovoltaic Application of Semiconducting Pd2Se3 Monolayer journal October 2018
Two-dimensional materials with intrinsic auxeticity: progress and perspectives journal January 2019

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