Correlated Perovskites as a New Platform for Super‐Broadband‐Tunable Photonics

Abstract

The electron-doping-induced phase transition of a prototypical perovskite SmNiO induces a large and non-volatile optical refractive-index change and has great potential for active-photonic-device applications. Strong optical modulation from the visible to the mid-infrared is demonstrated using thin-film SmNiO . Modulation of a narrow band of light is demonstrated using plasmonic metasurfaces integrated with SmNiO .

Beyond electrostatic modification: design and discovery of functional oxide phases via ionic-electronic doping

“…While the HSrCoO 3 phase is transparent throughout the measured spectrum, SrCoO 3-x is opaque, and SrCoO 2.5 is only transparent in the infrared range. Similar effects were also observed in hydrogen-doped SmNiO 3 , with large absorption change observed in the infrared region as the film was gradually doped by hydrogen [110].…”

“…The changes are typically due to either opening of the band gap or variations in the optical constants at certain wavelengths. Normally, protons [3,110,111], oxygen vacancies [112,113], small ions [114,115], and even defects [116] are used to dope the materials. Electric fields and electrochemical reactions can be used to reversibly control those reactions [3,117].…”

Antidoping in Insulators and Semiconductors Having Intermediate Bands with Trapped Carriers

“…In contrast to normal doping that is governed by classic defect physics [1,8], anti-doping represents perhaps the most unprecedent extreme form of a nonrigid response of D(ε) to doping, reversing entirely the expected trendreducing, rather than increasing conductivity by doping. In sharp contrast to the well-established "unsuccessful doping" that is usually detrimental to applications, anti-doping paves a new route for band gap modulation and resistance switching, and thus promises new directions of doping-induced multiple functionalities such as fuel cells, electric field sensors, Li-ion battery materials, and optical devices [4][5][6][7]9]. Because of the disparity in properties of the systems where such peculiar doping characteristic was observed, it would be tempting to dismiss these observations as specific idiosyncrasy of specifically complex or correlated systems.…”

Enhanced Electrocatalytic Oxygen Evolution Activity by Tuning Both the Oxygen Vacancy and Orbital Occupancy of B‐Site Metal Cation in NdNiO3

“…Particularly, several factors coexist in one system, making it a complex issue requiring further research. Generally, a typical strongly correlated electron system is present in most of the perovskite oxides, which simultaneously contains a complex mixture of charge, spin, orbitals, and lattice degrees of freedom that are strongly coupled, and a slight change in one factor will significantly influence the others. For instance, both the V O and the electronic structure of B‐site cations play important roles for OER.…”

“…Recently, RNiO 3 (R = Nd,…Lu; except for La) have become a fascinating system for multifunctional materials . Interestingly, by controlling V O and the electronic structure of B‐site transition‐metal cations, the RNiO 3 thin film will undergo a first‐order metal‐insulator transition (MIT) at room temperature .…”