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(a) Electron micrograph of electrodeposited ZnO nanowires on polycrystalline films on glass. (b) Tip view of a single ZnO wire showing a faceted hexagonal cross section.
Schematic diagram of nanowire LED arrangement with insulator filling the space between wires and a very thin film covering the wire tips.
Electron micrograph of nanowires embedded in PS. (a) Overview at beam incidence. (b) Close-up of nanowire tips with PS showing thin PS coverage at nanowire tips. (c) Scanning electron micrograph of a single nanowire tip. The layer thickness ranges between and 50 nm depending on preparation conditions.
(a) characteristics of the LED structure. For fast scans a NDR regime is observed, that can be attributed to a slow transport process and charging. In slower scans, a monotonic behavior is found. (b) PL and EL spectra obtained at room temperature in air. The PL is obtained with excitation at 355 nm of a frequency-tripled Nd–YAG laser. A strong excitonic band at 384 nm and a defect-related band centered at 620 nm are observed. The EL occurs at a threshold of . As in the PL spectrum, a defect-related band centered at 620 nm is observed. A shoulder indicates excitonic luminescence in the UV region.
Stability of light emission at room temperature in air. The solid line is a least-squares fit based on a stretched exponential dependence, with and .
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