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ZnO single nanowire photodetectors have been measured in different ambient conditions in order to understand and control adsorption processes on the surface. A decrease in the conductivity has been observed as a function of time when the nanowires are exposed to air, due to adsorbed O2/H2O species at the nanowire surface. In order to have a device with stable characteristics in time, thermal desorption...
Aluminum (Al) doped zinc oxide (ZnO) thin films with doping concentration of 1 at.% have been prepared using sol-gel spin-coating method. Annealing process has been applied on the prepared thin films at temperatures between 350 and 500 °C. The thin films were characterized using X-ray diffractometer (XRD), UV-Vis-NIR spectrophotometer and current voltage (I-V) measurement system for structural, optical...
In-plane directional electric property measurement in the semiconductors via electromechanical coupling is proposed. To estimate the properties in the crystal with less than 1 ????m (which is general value in intrinsic wide band-gap semiconductors), in-plane directional GHz bulk acoustic wave velocities and attenuations in a ZnO crystal have been theoretically and experimentally investigated, using...
Research on nanodielectrics has grown considerably in the last few years, in a bid to tap their potential as a class of improved high voltage insulating materials with unique properties. In the authors' group, improvement in dielectric properties of epoxy-resin samples (e.g. resistance to surface degradation) through the use of nano-sized alumina fillers was observed. Further, the improvement was...
Super high frequency (SHF) acoustic measurement realizes the piezoelectric characterization in semiconducting material without the effect of electrical conducting. We have proposed the method for measuring shear and extensional electromechanical coupling coefficient k15 and k33 in a semiconducting crystal simultaneously, using Brillouin scattering method. In ZnO crystal, k15 value measured from measured...
It was found that the dependence of the breakdown field E1mA and the activation energy, on Ag content are similar to that of the exponent of alphalf in low frequency region and alphahf in high frequency region on Ag content, which is a novel result in the research of varistor materials. By means of normalization of conductivity, it was found that samples with different Ag contents show similar mechanism...
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