Carrier recombination in sonochemically synthesized ZnO powders

Abstract

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.

A Simple Sonochemical Synthesis of Nanosized ZnO from Zinc Acetate and Sodium Hydroxide

“…The crystal phase, particle morphology and size turn out to vary opto-electronic properties of the powders, such as photoluminescence spectra and surface photovoltage decays. These were analyzed elsewhere [18].…”