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Carrier recombination in sonochemically synthesized ZnO powders

100%

Zakirov M. I. , Korotchenkov O. A.

Materials Science Poland

2017

tom Vol. 35, No. 1

211--216

ZnO powders with particle size in the nm to μm range have been fabricated by sonochemical method, utilizing zinc acetate and sodium hydroxide as starting materials. Carrier recombination processes in the powders have been investigated using the photoluminescence, FT-IR and surface photovoltage techniques. It has been shown that the photoluminescence spectra exhibit a number of defect-related emission bands which are typically observed in ZnO lattice and which depend on the sonication time. It has been found that the increase of the stirring time results in a faster decay of the photovoltage transients for times shorter than approximately 5 ms. From the obtained data it has been concluded that the sonication modifies the complicated trapping dynamics from volume to surface defects, whereas the fabrication method itself offers a remarkably convenient means of modifying the relative content of the surface-to-volume defect ratio in powder grains and altering the dynamics of photoexcited carriers.

Variational treatment of a vibrating LiNbO3-based rectangular hybrid structure: the developing of a functional for computing surface-load configurations

80%

Polovina O. I. , Kuryliuk V. V. , Korotchenkov O. A.

Archives of Acoustics

2009

tom Vol. 34, No. 2

231-249

Electrically-excited electroelastic extensional vibrations of an arbitrarily cut three-dimensional piezocrystal resonator are analyzed variationally. A set of trigonometric trial functions applicable to a waveguide behavior of the resonator partly covered by metal electrodes is proposed. The dependence of the content of the vibration modes sustained by the resonator on the electrode configuration is found. The frequency spectra taken in 128o-γ-rotated LiNbO3 rectangular plates exhibit a good conformity with the computed resonator eigenfrequencies.