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Striated 2D lattice with sub‐nm 1D etch channels by controlled thermally induced phase transformations of PdSe2

DOI: 10.1002/adma.201904251 DOI Help

Authors: Gyeong Hee Ryu (University of Oxford) , Taishan Zhu (Massachusetts Institute of Technology) , Jun Chen (University of Oxford) , Sapna Sinha (University of Oxford) , Viktoryia Shautsova (University of Oxford) , Jeffrey C. Grossman (Massachusetts Institute of Technology) , Jamie H. Warner (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Advanced Materials , VOL 16

State: Published (Approved)
Published: September 2019
Diamond Proposal Number(s): 16854

Abstract: 2D crystals are typically uniform and periodic in‐plane with stacked sheet‐like structure in the out‐of‐plane direction. Breaking the in‐plane 2D symmetry by creating unique lattice structures offers anisotropic electronic and optical responses that have potential in nanoelectronics. However, creating nanoscale‐modulated anisotropic 2D lattices is challenging and is mostly done using top‐down lithographic methods with ≈10 nm resolution. A phase transformation mechanism for creating 2D striated lattice systems is revealed, where controlled thermal annealing induces Se loss in few‐layered PdSe2 and leads to 1D sub‐nm etched channels in Pd2Se3 bilayers. These striated 2D crystals cannot be described by a typical unit cells of 1–2 Å for crystals, but rather long range nanoscale periodicity in each three directions. The 1D channels give rise to localized conduction states, which have no bulk layered counterpart or monolayer form. These results show how the known family of 2D crystals can be extended beyond those that exist as bulk layered van der Waals crystals by exploiting phase transformations by elemental depletion in binary systems.

Journal Keywords: 1D channels; 2D crystals; Pd2Se3; PdSe2; Se vacancies; STEM

Subject Areas: Materials, Physics

Diamond Offline Facilities: Electron Physical Sciences Imaging Centre (ePSIC)
Instruments: E01-JEM ARM 200CF

Added On: 08/10/2019 10:42

Discipline Tags:

Materials Science Physics Surfaces interfaces and thin films

Technical Tags:

Microscopy Electron Microscopy (EM) Scanning Transmission Electron Microscopy (STEM)