“…The nearest-neighbor hopping conductivity and the charge transfer, connected to activation of holes into the delocalized states of the acceptor band, are identified above and below the Mott VRH conduction domain, respectively. …”
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“…Ultrathin LaCoO(3) capping layers of 2–8 unit cells on La(0.6)Sr(0.4)CoO(3) show intermediate OER activity between La(0.6)Sr(0.4)CoO(3) and LaCoO(3) evidently caused by the increased surface Co–O covalency compared to single LaCoO(3) as detected by X-ray photoelectron spectroscopy. A Mott–Schottkyanalysis revealed low flat band potentials for different LaCoO(3) capping layer thicknesses, indicating that no limiting extended space charge layer exists under OER conditions as all catalyst bilayer films exhibited hole accumulation at the surface. …”
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“…The doping of the n−Cu(2)O thin films with K ions was well identified using XRD, Raman, SEM, EDX, UV-vis, PL, photocurrent, Mott–Schottky, and EIS measurements. The results of the XRD show the creation of cubic Cu(2)O polycrystalline and monoclinic CuO, with the crystallite sizes ranging from 55 to 25.2 nm. …”
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“…We observed appearance of new electron-addition states with increasing Rh concentration (x in Sr(2)Ir(1−x)Rh(x)O(4)) in accordance with the concept of hole doping. The intensity of the hole-induced state is however weak, suggesting weakness of charge transfer (CT) effect and Mott insulating ground states. …”
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“…The prepared ZnO@Bi(5)O(7)I composites were physically and chemically characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer–Emmet–Teller (BET) surface area, UV–Vis diffuse reflectance spectroscopy (DRS), emission fluorescence spectra, transient photocurrent response, electrochemical impedance spectra and Mott–Schottky. Among the composites formed an n–n heterojunction, which increased the separation efficiency of electrons and holes and the efficiency of charge transfer. …”
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“…The combination of high dielectric constant and low effective mass promotes both Wannier-Mott exciton separation and effective ionization of donor and acceptor defects. …”
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“…By tuning the optical excitation density above the Mott threshold, we realize the phase transition from interlayer excitons to charge-separated electron/hole plasmas, where photoexcited electrons and holes are localized to individual layers. …”
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“…Specifically, the main portions of the Fermi surface are extremely similar to that of the bilayer cuprates, with an additional piece that can accommodate additional hole doping. We find that the electronic correlations are about twice as strong in the nickelates and are almost k-independent, indicating that they originate from a local effect, likely the Mott interaction, whereas cuprate interactions are somewhat less local. …”
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“…At [Image: see text], there is a band insulator to Mott insulator transition accompanying with the presence of the antiferromagnetic order. …”
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“…Unlike conventional photon lasing, in which the threshold is limited by the population inversion of the electron-hole plasma, the exciton lasing generated by exciton-exciton scattering and the polariton lasing generated by dynamical condensates have received considerable attention in recent years because of the sub-Mott density and low-threshold operation. …”
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“…These results unveil an unconventional mechanism at the base of HTSC both below and above the optimal hole concentration required to attain the maximum critical temperature (T(c)).…”
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“…The time scale of this process is a few hundreds of femtoseconds. Then in the hole-doped correlated metallic titanate, we show how pure spin-currents can be achieved to yield spin-polarizations exceeding those observed in classic semiconductors. …”
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“…So, the band alignment allowed the S-scheme to work, leading to an efficient separation of photogenerated electrons and holes, which was confirmed by the greatly increased photocurrents measured with the composites.…”
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“…Here we exploit lightwave-driven charge transport7–24, the backbone of attosecond science9–13, to explore ultrafast quasiparticle collisions directly in the time domain: A femtosecond optical pulse creates excitonic electron–hole pairs in the layered dichalcogenide tungsten diselenide while a strong terahertz field accelerates and collides the electrons with the holes. …”
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“…Based on ultraviolet photoelectron spectrometry (UPS), Mott–Schottky plot, photocurrent and photoluminescence spectroscopy (PL) results, the photo-induced electrons from the conduction band of γ-Fe(2)O(3) could transport quickly to the valence band of MoS(2)via highly conductive graphene as an electron transport channel, which could significantly enhance the electron–hole separation efficiency as well as photocatalytic performance.…”
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“…Fifty years ago Walter Kohn speculated that a zero-gap semiconductor might be unstable against the spontaneous generation of excitons–electron–hole pairs bound together by Coulomb attraction. …”
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“…Yet it is crucial to establish whether light absorption creates uncorrelated electron–hole pairs or bound excitons and, in the latter case, to determine their character. …”
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“…Further analysis was performed to highlight the photoelectrochemical activity of the prepared photocatalysts such as electrochemical impedance spectroscopy, linear sweep voltammetry, photocurrent response, and a Mott–Schottky study. The crystalline Dy(2)O(3)/TNF exhibits superb photocatalytic activity attributed to the improved charge transfer, reduced recombination rate of the electron–hole pairs, and a remarkable red-shift in light absorption.…”
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“…The experimental results confirm that the light-induced holes owing to the favourable redox potential of the catalyst oxidize N(2)H(4) to N(2) and liberate H(+) ions, which subsequently react with photogenerated electrons to facilitate the reduction of nitrobenzene. …”
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