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Wide-bandgap zinc oxide (ZnO) semiconductors and nanowires have become important materials for electronic and photonic device applications. In this work, we report the growth of well-aligned single-crystal ZnO nanowire arrays on sapphire substrates by chemical vapor deposition and the development of atom probe tomography, an emerging nanoscale characterization method capable of providing deeper insight...
With the increasing worldwide need for energy, fossil fuels will not be able to keep up with demand in the coming decades. Solar energy is one of the best solutions to this problem with the advantages of being clean and sustainable. Among the various designs of solar cells, dye-sensitized solar cells provide relatively high efficiency with large scale for a low cost [1]. Conventional dye-sensitized...
We report the realization of hybrid nanostructures that combine inorganic InP/ZnS core-shell quantum dots and wide bandgap ZnO nanowires with an organic polymer matrix compound, which can potentially enable optoelectronic devices novel functionalities, including photovoltaics. The ZnO nanowires were synthesized by thermal chemical vapor deposition prior to functionalization with the quantum dots and...
In this work, we report the growth and nanoscale characterization of single crystal zinc oxide nanowires synthesized by thermal chemical vapor deposition. Scanning electron microscopy, high-resolution transmission electron microscopy, x-ray diffraction, photoluminescence and Raman spectroscopy confirmed the high quality nature of the materials. To analyze their electrical properties, terahertz time...
We report hybrid inorganic/organic photovoltaic heterojunction structures based on quantum dot functionalized nanowires. Single crystalline ZnO nanowires were first functionalized with InP/ZnS core-shell quantum dots and then embedded in a conductive polymer hole matrix to achieve a low cost, high efficiency device structure. The device structures were characterized by scanning electron microscopy,...
High quality ZnO nanowires were synthesized by chemical vapor deposition using both a catalyst-assisted vapor-liquid-solid and a catalyst-free vapor-solid deposition approach. And their optical properties studied using photoluminescence and Raman spectroscopy combined with confocal laser scanning microscopy. Strong UV near band edge along with defect related visible luminescence emissions were observed...
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