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Schottky barrier

About: Schottky barrier is a research topic. Over the lifetime, 22570 publications have been published within this topic receiving 427746 citations. The topic is also known as: Schottky barrier junction.


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Journal ArticleDOI
TL;DR: In this paper, a nonvolatile bipolar resistive switching has been observed in an Au/BiFeO3/Pt structure, where a Schottky contact and a quasi-Ohmic contact were formed at the AU/BiO3 and BiO3-Pt interfaces, respectively.
Abstract: Nonvolatile bipolar resistive switching has been observed in an Au/BiFeO3/Pt structure, where a Schottky contact and a quasi-Ohmic contact were formed at the Au/BiFeO3 and BiFeO3/Pt interface, respectively. By changing the polarity of the external voltage, the Au/BiFeO3/Pt is switched between two stable resistance states without an electroforming process. The resistance ratio is larger than two orders of magnitude. The resistive switching is understood by the electric field–induced carrier trapping and detrapping, which changes the depletion layer thickness at the Au/BiFeO3 interface.

111 citations

Journal ArticleDOI
TL;DR: In this paper, a thin film of metalfree or zinc phthalocyanine is interposed between an ohmic contact (Au) and a blocking contact (Al or In), and the action spectra of the shortcircuit photocurrent suggest that only light absorbed near the blocking contact is effective in producing carriers for the external circuit.
Abstract: Rather strong rectification and photovoltaic effects are observed for sandwich cells in which a thin film (∼3000 A) of metalfree or zinc phthalocyanine is interposed between an ohmic contact (Au) and a blocking contact (Al or In). The action spectra of the short‐circuit photocurrent suggest that only light absorbed near the blocking contact is effective in producing carriers for the external circuit. Cells with indium contacts show performance that is quantitatively consistent with the presence of a Schottky junction at that contact. The quantum efficiency for light incident on the ZnPc phase of an (In/ZnPc/Au) cell can be as high as 14% at 6328 A. For light actually absorbed in the barrier region, the yield approaches unity. The efficiencies of cells with aluminum contacts are 2–3 orders smaller, apparently because an insulating layer (∼65 A) of Al2O3 occupies the Al/ZnPc junction. This interfacial insulating film also affects the relation between the short‐circuit photocurrent and the light intensity. In cells with In contacts, there is a linear, or nearly linear, current response; but for devices with Al contacts, the photocurrent rises as the cube root of the intensity. The latter dependence can be analyzed in terms of coupled diffusion and second‐order decay of light‐generated carriers produced near the blocking contact.

111 citations

Journal ArticleDOI
TL;DR: A nanostructure by embedding Au nanoparticles into ZnO/NiO core-shell composites as supercapacitors electrodes materials is designed, which exhibited an excellent electrochemical performance including a long-term cycling stability and a maximum specific areal capacitance.
Abstract: Here we design a nanostructure by embedding Au nanoparticles into ZnO/NiO core-shell composites as supercapacitors electrodes materials. This optimized hybrid electrodes exhibited an excellent electrochemical performance including a long-term cycling stability and a maximum specific areal capacitance of 4.1 F/cm(2) at a current density of 5 mA/cm(2), which is much higher than that of ZnO/NiO hierarchical materials (0.5 F/cm(2)). Such an enhanced property is attributed to the increased electro-electrolyte interfaces, short electron diffusion pathways and good electrical conductivity. Apart from this, electrons can be temporarily trapped and accumulated at the Fermi level (EF') because of the localized schottky barrier at Au/NiO interface in charge process until fill the gap between ZnO and NiO, so that additional electrons can be released during discharge. These results demonstrate that suitable interface engineering may open up new opportunities in the development of high-performance supercapacitors.

111 citations

Journal ArticleDOI
TL;DR: It is demonstrated that the band alignment of the layered heterostructures can be manipulated by lattice engineering of 2D nanosheets to enhance optoelectronic performance.
Abstract: Layered van der Waals heterostructures have attracted considerable attention recently, due to their unique properties both inherited from individual two-dimensional (2D) components and imparted from their interactions. Here, a novel few-layer MoS2 /glassy-graphene heterostructure, synthesized by a layer-by-layer transfer technique, and its application as transparent photodetectors are reported for the first time. Instead of a traditional Schottky junction, coherent ohmic contact is formed at the interface between the MoS2 and the glassy-graphene nanosheets. The device exhibits pronounced wavelength selectivity as illuminated by monochromatic lights. A responsivity of 12.3 mA W-1 and detectivity of 1.8 × 1010 Jones are obtained from the photodetector under 532 nm light illumination. Density functional theory calculations reveal the impact of specific carbon atomic arrangement in the glassy-graphene on the electronic band structure. It is demonstrated that the band alignment of the layered heterostructures can be manipulated by lattice engineering of 2D nanosheets to enhance optoelectronic performance.

111 citations

Journal ArticleDOI
TL;DR: In this paper, the electrical conduction mechanism of (Ba0.5,Sr 0.5)TiO3 (BST) as a function of the temperature was studied.
Abstract: The electrical conduction mechanism of (Ba0.5,Sr0.5)TiO3 (BST) as a function of the temperature was studied. Au/BST/Pt metal–insulator–metal capacitors were fabricated. The temperature range was from 300 to 423 K. The conduction current depended on the voltage polarity. At high electrical field (>800 kV/cm) and with the Pt electrode biased negatively, the Pt/BST interface forms a Schottky barrier with a barrier height of 0.58 eV from 300 to 373 K. The Au/BST interface forms an ohmic contact. The conduction current when the Au electrode is biased negatively shows space-charge-limited-current behavior. An energy band diagram is proposed to explain the experimental results.

111 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023565
2022988
2021672
2020758
2019824
2018847