Highly conductive PdCoO2 ultrathin films for transparent electrodes

Abstract

We report on the successful synthesis of highly conductive PdCoO2 ultrathin films on Al2O3 (0001) by pulsed laser deposition. The thin films grow along the c-axis of the layered delafossite structure of PdCoO2, corresponding to the alternating stacking of conductive Pd layers and CoO2 octahedra. The thickness-dependent transport measurement reveals that each Pd layer has a homogeneous sheet conductance as high as 5.5 mS in the samples thicker than the critical thickness of 2.1 nm. Even at the critical thickness, high conductivity exceeding 104 Scm-1 is achieved. Optical transmittance spectra exhibit high optical transparency of PdCoO2 thin films particularly in the near-infrared region. The concomitant high values of electrical conductivity and optical transmittance make PdCoO2 ultrathin films as promising transparent electrodes for triangular-lattice-based materials.

References in corpus (5)

• Evidence for hydrodynamic electron flow in PdCoO${}_2$
• The properties of ultrapure delafossite metals
• Maximal Rashba-like spin splitting via kinetic energy-driven inversion symmetry breaking
• On the metallic conductivity of the delafossites PdCoO2 and PtCoO2
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Cited by in corpus (14)

• Growth of metallic delafossite PdCoO2 by molecular beam epitaxy
• Super-geometric electron focusing on the hexagonal Fermi surface of PdCoO${}_2$
• Anomalous Hall effect at the spontaneously electron-doped polar surface of PdCoO2 ultrathin films
• From basic properties to the Mott design of correlated delafossites
• Growth of CuFeO${}_2$ Single Crystals by the Optical Floating-Zone Technique
• Nonreciprocal transport in a Rashba ferromagnet, delafossite PdCoO${}_2$
• Tuneable electron-magnon coupling of ferromagnetic surface states in PdCoO${}_2$
• Metallic delafossite thin films for unique device applications
• Determination of the phase coherence length of PdCoO${}_2$ nanostructures
• A 3D Tight-Binding Model for La-Based Cuprate Superconductors
• Growth of delafossite CuAlO2 single crystals in a reactive crucible
• Disorder-enhanced effective masses and deviations from Matthiessen's rule in PdCoO${}_2$ thin films
• Layer-Resolved Many-Electron Interactions in Delafossite PdCoO2 from Standing-Wave Photoemission Spectroscopy
• Control of Impurity Phase Segregation in a PdCrO${}_2$/CuCrO${}_2$ Heterostructure