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Ambipolar Memristive Phenomenon in Large-Scale, Few-Layered αMoO <sub/>3</sub> Recrystallized Films
摘要： Studies of two-dimensional (2D) oxide materials are not common, primarily because of the difficulty in obtaining crystal sizes large enough to fabricate devices structures from exfoliation of bulk crystals. Among the layered oxide materials, alpha molybdenum trioxide (αMoO3) is of particular interest because of its wide bandgap and high hole mobility. Here the growth of highly uniform, large-scale, ambipolar, few-layered αMoO3 that is appropriate for nanofabrication is reported. Crystal grain sizes on the order of 5 μm are observed across samples as large as 10 × 10 mm2 with hexagonal grain boundaries and surface roughness of less than 500 pm rms. Exact [010] crystal orientation, characteristic of the layered atomic structure αMoO3, is observed. The measured bandgap energy is ≈2.8 eV. Carrier mobilities in polycrystalline films are and 2.28 cm2 V?1 s?1 (hole) and 3.18 cm2 V?1 s?1 (electron) at room temperature in air. Simple field-effect device structures are characterized by ambipolar carrier transport producing memristive device characteristics, which is attributed to a polarization field produced by the strong coupling between electron and phonons in these crystals.
关键词： ambipolar,2D materials,molybdenum oxides,memristor
更新于2025-09-23 15:21:01
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Enhanced Performance and Stability of Ternary Organic Solar Cells Utilizing Two Similar Structure Blend Fullerene‐Free Molecules as Electron Acceptor
摘要： Two-dimensional amorphous semiconductor (2DAS) monolayers can be regarded as a new phase of 2D monolayers materials and will serve as a promising field for the various electronic and optoelectronic applications. Here, together with the first-principles calculations within density functional theory, we experimentally demonstrate that the 2DAS MoO3-x monolayers can enhance the electrochemical nitrogen reduction reaction (NRR). To be specific, the NH3 yield and faradaic efficiency (FE) reach 35.83 ug h-1 mg-1 cat at -0.40 V and 12.01 % at -0.20 V vs. reversible hydrogen electrode (RHE), respectively, and which can be dramatically improved than that of reported defective MoO3 nanosheets. Further theoretical calculations reveal that the high electrochemical performance in NH3 yield is contributed to the strong Anderson localization and electron confinement dimensionally. And such Anderson tail states can resonate effectively with the states of intermediate HNNH, playing the critical role in the rate limiting step of NRR. Integrated experimental findings and theoretical understanding, a new concept of Anderson confinement catalysis is put forward, and could be extended to other 2DAS for potential catalytic reactions.
关键词： Anderson localization,amorphous,nitrogen reduction reaction,molybdenum oxides,supercritical CO2
更新于2025-09-19 17:13:59
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Effect of the Substrate Temperature on the Structural and Morphological Properties of MoO2 Thin Films Obtained by Pulsed Injection MOCVD
摘要： Molybdenum oxides is of great technological interest due to their outstanding optical, electronic and catalytic properties. In this work, molybdenum dioxide (MoO2) thin films were deposited onto Si wafers and stainless steel substrates at different substrate temperatures. The growth of the films was achieved by using a vertical metal organic chemical vapor deposition reactor working in pulsed injection mode. A powder of molybdenum hexacarbonyl mixed in a toluene solution was used as precursor. An effective pulsed injection system to supply the precursor, usually used for fuel injection in internal combustion devices, delivers a precise amount of liquid precursor to the reactor through injectors, whose pulse intervals (injection frequency) are controlled by a computer-driven system. The use of a liquid solution as precursor along with the experimental parameters provide thermodynamically favorable conditions to fabricate a thin solid film, homogenously deposited onto the whole substrate. The MoO2 film structure and morphology were studied by X-ray diffraction, Raman scattering spectroscopy and scanning electron microscopy. Moreover, a comparative study was undertaken whereby the catalytic activity of stainless steel substrate for hydrogen evolution reaction was related to that of MoO2 thin film.
关键词： catalytic activity,MOCVD,MoO2 thin films,molybdenum oxides
更新于2025-09-09 09:28:46