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Springer Science and Business Media LLC Light: Science & Applications 12(1)
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    초록·키워드

    The long-standing challenge in designing far-infrared transparent conductors (FIRTC) is the combination of high plasma absorption edge (λ<sub>p</sub>) and high conductivity (σ). These competing requirements are commonly met by tuning carrier concentration or/and effective carrier mass in a metal oxide/oxonate with low optical dielectric constant (ε<sub>opt</sub> = 2-7). However, despite the high σ, the transparent band is limited to mid-infrared (λ<sub>p</sub> < 5 μm). In this paper, we break the trade-off between high σ and λ<sub>p</sub> by increasing the "so-called constant" ε<sub>opt</sub> that has been neglected, and successfully develop the material family of FIRTC with ε<sub>opt</sub> > 15 and λ<sub>p</sub> > 15 μm. These FIRTC crystals are mainly octahedrally-coordinated heavy-metal chalcogenides and their solid solutions with shallow-level defects. Their high ε<sub>opt</sub> relies on the formation of electron-deficiency multicenter bonds resulting in the great electron-polarization effect. The new FIRTC enables us to develop the first "continuous film" type far-infrared electromagnetic shielder that is unattainable using traditional materials. Therefore, this study may inaugurate a new era in far-infrared optoelectronics.

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