<abstract xmlns="http://www.w3.org/1999/xhtml"><p>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.</p></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.

Carrier recombination in sonochemically synthesized ZnO powders

Materials Science-Poland

This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

{"article-title":"Carrier recombination in sonochemically synthesized ZnO powders"}

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...

Sample	Peak position of the decomposed band [nm]	Type of transition responsible for the band	Intensity of the decomposed band normalized to the maximum peak value	Literature
SC1	589	Zn_i → O_i (CB-O_i)	0.58	[30–33]
SC1	693	V_o → VB	0.53	[31, 34]
SC2	612	CB → O_i (Zn_i-O_i)	0.80	[31, 33, 35]
SC2	797	Zn_i → V_o (CB → V_o)	0.28	[30, 34]
SC3	566	CB → V_o (Zn_i-V_o)	0.52	[36–39]
SC3	647	CB → O_i	0.59	[10, 31]

Carrier recombination in sonochemically synthesized ZnO powders

Published Online: Apr 23, 2017

Page range: 211 - 216

Received: Mar 22, 2016

Accepted: Dec 18, 2016

DOI: https://doi.org/10.1515/msp-2017-0016

Keywords
ZnO, sonochemical synthesis, surface photovoltage, photoluminescence

© 2017 M.I. Zakirov, O.A. Korotchenkov

This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Decomposed band parameters and peak attribution for the PL spectra given in Fig. 1.

Carrier recombination in sonochemically synthesized ZnO powders

Published Online: Apr 23, 2017

Page range: 211 - 216

Received: Mar 22, 2016

Accepted: Dec 18, 2016

DOI: https://doi.org/10.1515/msp-2017-0016

KeywordsZnO, sonochemical synthesis, surface photovoltage, photoluminescence

© 2017 M.I. Zakirov, O.A. Korotchenkov

This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Decomposed band parameters and peak attribution for the PL spectra given in Fig. 1.

Keywords
ZnO, sonochemical synthesis, surface photovoltage, photoluminescence