Volume 99, Issue 8, 15 April 2006
Index of content:
99(2006); http://dx.doi.org/10.1063/1.2190711View Description Hide Description
Copper-doped ZnO (ZnO:Cu) films were prepared on silicon substrates by filtered cathodic vacuum arc technique at room temperature using a Zn target containing of Cu. Room temperature ferromagnetism was observed in the ZnO:Cu films with saturation magnetization of atom. The origin of the ferromagnetism in ZnO:Cu was mainly due to Cu ions substituted into the ZnO lattice. X-ray diffraction, x-ray photoelectron spectroscopy, and transmission electron microscopy revealed that no ferromagnetic-related secondary phase could be detected in ZnO:Cu.
99(2006); http://dx.doi.org/10.1063/1.2188070View Description Hide Description
Hydrogen terminated intrinsic diamond is characterized using photoelectron emission spectroscopy. Samples have been annealed at temperatures from . The electron emission characteristics can be divided into three regimes: (I) is governed by surface band bending which allows only excitons to reach the surface with subsequent dissociation. (II) shows increased electron emission and the surface band bending has been removed. Here, excitons and electrons contribute. (III) additional rise of emission is detected. The spectra are dominated by photon-phonon interactions which are discussed in detail.
99(2006); http://dx.doi.org/10.1063/1.2186370View Description Hide Description
Nanocrystallinefilms were synthesized by pulsed laser deposition at various Ar gas pressures without substrate heating or postannealing treatment. Crystallinity, chemical composition, absorbance, optical energyband gap, and photoluminescence(PL) of the films were found to be strongly dependent on the Ar pressure. The optical energyband gap was in a range of and PL peak position in the spectra was positioned in a blueshifted region around at room temperature. Compared with emission at around of bulk targets under the same excitation conditions, our results clearly demonstrate the blueshift of PL emission induced by the quantum-size effect.