Infrared Transparent and Electromagnetic Shielding Correlated Metals via Lattice-Orbital-Charge Coupling.
Youngkyoung HaJinho ByunJaekwang LeeJaeseok SonYounghak KimShinbuhm LeePublished in: Nano letters (2022)
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 SrVO 3 with BaVO 3 , the medium wavelength infrared transmittance at a wavelength of 4 μm is found to be 50% higher than those for Sn-doped In 2 O 3 (ITO) and La-doped BaSnO 3 (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 VO 6 oxygen octahedra in SrVO 3 due to the substitution of Sr 2+ with larger Ba 2+ 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.
Keyphrases
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