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Emission Diversity of ZnO Nanocrystals with Different Growth Temperatures

Published online by Cambridge University Press:  29 August 2014

E. Velázquez Lozada ,
T. Torchynska  and
G. Camacho González
E. Velázquez Lozada*
Affiliation:
SEPI – ESIME – INSTITUTO POLITECNICO NACIONAL, México D. F. 07738, México.,
T. Torchynska
Affiliation:
ESFM – INSTITUTO POLITECNICO NACIONAL, México D. F. 07738, México.
G. Camacho González
Affiliation:
ESIME – INSTITUTO POLITECNICO NACIONAL, México D. F. 07738, México.
*
*Email: [email protected]
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Abstract

Scanning electronic microscopy (SEM), X ray diffraction (XRD) and photoluminescence (PL) have been applied to the study of structural and optical properties of ZnO nanocrystals prepared by the ultrasonic spray pyrolysis (USP) at different temperatures. The variation of temperatures and times at the growth of ZnO films permits modifying the ZnO phase from the amorphous to crystalline, to change the size of ZnO nanocrystals (NCs), as well as to vary their photoluminescence spectra. The study has revealed three types of PL bands in ZnO NCs: defect related emission, the near-band-edge (NBE) PL, related to the LO phonon replica of free exciton (FE) recombination, and its second-order diffraction peaks. The PL bands, related to the LO phonon replica of FE, and its second-order diffraction in the room temperature Pl spectrum testify on the high quality of ZnO films prepared by the USP technology.

Keywords

spray depositionx-ray diffraction (XRD)scanning electron microscopy (SEM)
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1675: Symposium K/RR – Synthesis, Characterization and Applications of Functional Materials—Thin Films and Nanostructures , 2014 , pp. 45 - 51
Copyright
Copyright © Materials Research Society 2014 

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