Infrared Transparent and Electromagnetic Shielding Correlated Metals via Lattice-Orbital-Charge Coupling

Abstract

Despite being a requisite for modern transparent electronics, few metals have a sufficiently high infrared transmittance due to the free electron response. Here, upon alloying the correlated metal SrVO3 with BaVO3, the medium wavelength infrared transmittance at a wavelength of 4 μm is found to be 50% higher than those for Sn-doped In2O3 (ITO) and La-doped BaSnO3 (BLSO). The room temperature resistivity of the alloy of ∼100 μΩ cm is 1 order of magnitude lower than those of ITO and BLSO, guaranteeing a profound electromagnetic shielding effectiveness of 22–31 dB at 10 GHz in the X-band. Systematic investigations reveal symmetry breaking of VO6 oxygen octahedra in SrVO3 due to the substitution of Sr2+ with larger Ba2+ ions, localization of electrons in the lower energy V-d yz and d zx orbitals, and stronger correlation effects. The lattice-orbital-charge-coupled engineering of the electronic band structure in correlated metals offers a new design strategy to create super-broad-band transparent conductors with an enhanced shielding capability.

Vertically aligned nanocomposite films by self‐assembled epitaxial nucleation for super‐broadband transparent conductors

“…The transmission mode of the ultraviolet–visible near‐infrared spectrophotometer was used over the wavelength range 175–3300 nm (Cary 5000; Agilent Technologies), and the Fourier transform infrared microscope was operated in the wavelength range 2500–10000 nm (Nicolet Continuum; Thermo Fisher Scientific). Our measurements were highly reliable as the transmittance of SrVO 3 was similar to the values of earlier studies 38,39 . To investigate the transport properties, four platinum pads were deposited on the film surface by direct‐current magnetron sputtering.…”

“…Our measurements were highly reliable as the transmittance of SrVO 3 was similar to the values of earlier studies. 38,39 To investigate the transport properties, four platinum pads were deposited on the film surface by direct-current magnetron sputtering. Using a physical property measurement system (Quantum Design Inc.), the resistance of the film (<10 MΩ) was measured under an applied current upon cooling and subsequent heating over a 10-400 K temperature range.…”

“…We briefly explain why we chose metallic SrVO 3 and insulating Ba 3 V 2 O 8 in the VAN-TC films. For the matrix, we used correlated TC SrVO 3 because of its high visible transmittance and good metallic behavior [35][36][37][38][39] ; it has a sheet resistance 1-2 orders of magnitude smaller than that of conventional TC, ITO and La-doped BaSnO 3 . For the nanocolumns, we used insulating Ba 3 V 2 O 8 , a material with excellent photoluminescent and photocatalytic properties, [40][41][42] that guarantees high transmittance owing to its large bandgap (>3.85 eV).…”

Tailoring Optical Properties in Transparent Highly Conducting Perovskites by Cationic Substitution

“…Here we focus on the optical spectrum of an ideal transparent conductor where the transparency window covers the whole visible light range. In literature, several ways to manipulate the optical transparency and plasmon excitation energy in conducting perovskite oxides have been reported including strain engineering, [21,22] off-stoichiometry, [23,24] A-site, [25][26][27][28] and anion substitution. [29] B-site substitution has been investigated in the physically highly interesting system SrV 1−x Ti x O 3 , [30][31][32] where a composition-driven metal insulator transition occurs for x ≈ 0.4-0.6 due to the 3d 0 electronic configuration of Ti 4+ .…”

Asymmetrically structured polyvinylidene fluoride composite for directional high absorbed electromagnetic interference shielding

“…Metals 3,4 and metal oxides [5][6][7] are widely used as conventional EMI shielding materials. However, the application of such materials can be limited by their high density, poor corrosion resistance and processing difficulties.…”