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Interfacial structure of SrZr <sub/><i>x</i> </sub> Ti <sub/>1?</sub><sub/><i>x</i> </sub> O <sub/>3</sub> films on Ge
摘要： The interfacial structure of SrZrxTi1?xO3 films grown on semiconducting Ge substrates is investigated by synchrotron X-ray diffraction and first-principles density functional theory. By systematically tuning the Zr content x, the effects of bonding at the interface and epitaxial strain on the physical structure of the film can be distinguished. The interfacial perovskite layers are found to be polarized as a result of cation-anion ionic displacements perpendicular to the perovskite/semiconductor interface. We find a correlation between the observed buckling and valence band offsets at the SrZrxTi1?xO3/Ge interface. The trends in the theoretical valence band offsets as a function of Zr content for the polar structures are in agreement with reported X-ray photoelectron spectroscopy measurements. These results have important implications for the integration of functional oxide materials with established semiconductor based technologies.
关键词： synchrotron X-ray diffraction,density functional theory,valence band offsets,SrZrxTi1?xO3 films,Ge substrates,interfacial structure
更新于2025-09-23 15:21:01
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Boosted Reactivity of Low-Cost Solar Cells over a CuO/Co <sub/>3</sub> O <sub/>4</sub> Interfacial Structure Integrated with Graphene Oxide
摘要： Developing cost-effective and environment-friendly counter electrodes (CEs) with high performance is central for the commercial application of dye-sensitized solar cells (DSSCs). In this work, the porous interfacial CuO/Co3O4@GO (CCO@GO) hybrid was fabricated by encapsulating the self-assembled CuO/Co3O4 nanosphere in graphene oxide (GO) and acted as a CE for the first time. Further measurements verified that the optimized CCO@GO hybrid not only provided a higher specific surface area (86.7 m2?g?1) with more exposed catalytic sites, but also significantly enhanced the power conversion efficiency (PCE = 8.34%) of DSSC, which was higher than that of the Co3O4-based CE (2.66%) and commercial Pt CE (7.85%). The results indicate that the interfacial CuO/Co3O4@GO hybrid synergistically accelerates the diffusion of I3?/I? redox couple and transmission of electrons, thus promoting the reaction kinetics. This work provides a remarkable way for exploring economical high-performance Pt-free CEs for DSSCs, as well as contributes to the further development for other energy-related fields.
关键词： DSSCs,interfacial structure,transition metal oxides,CuO/Co3O4@GO,counter electrode
更新于2025-09-23 15:19:57
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Two-Dimensional Covalent Organic Framework–Graphene Photodetectors: Insight into the Relationship between the Microscopic Interfacial Structure and Performance
摘要： Graphene is an attractive material for photodetection and optoelectronic applications because it offers a broad spectral bandwidth and ultrafast response speed. However, because of the broad light absorption characteristic, graphene has a lack of selectivity to the wavelength, which limits the performance of graphene-based photodetectors. Here, we demonstrate a novel hybrid photodetector with monolayer graphene covered with an ultrathin film of surface covalent organic frameworks (COFs) with variable structures as the light-harvesting materials. Photodetectors based on surface COF?G show enhanced responsivity in comparison with unmodified graphene and graphene modified with monomers. The submolecular resolution of scanning tunneling microscopy allows us to get a direct insight into the relationship between the microscopic interfacial structure and the performance of the device. We prove that the enhancement in the device performance is directly related with the orderliness of surface COFs, which influences the interfacial charge transfer by tuning π?π stacking between surface COF and graphene.
关键词： covalent organic frameworks,photodetector,charge transfer,interfacial structure,graphene
更新于2025-09-11 14:15:04