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Photoluminescence of spray pyrolysis deposited ZnO nanorods.

Kärber E, Raadik T, Dedova T, Krustok J, Mere A, Mikli V, Krunks M - Nanoscale Res Lett (2011)

Bottom Line: A dominant near band edge (NBE) emission is observed at 300 K and at 10 K.High-resolution photoluminescence measurements at 10 K reveal fine structure of the NBE band with the dominant peaks related to the bound exciton transitions.It is found that all studied technological parameters affect the excitonic photoluminescence in ZnO nanorods.PACS: 78.55.Et, 81.15.Rs, 61.46.Km.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Materials Science, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia. malle@staff.ttu.ee.

ABSTRACT
Photoluminescence of highly structured ZnO layers comprising well-shaped hexagonal rods is presented. The ZnO rods (length 500-1,000 nm, diameter 100-300 nm) were grown in air onto a preheated soda-lime glass (SGL) or ITO/SGL substrate by low-cost chemical spray pyrolysis method using zinc chloride precursor solutions and growth temperatures in the range of 450-550°C. We report the effect of the variation in deposition parameters (substrate type, growth temperature, spray rate, solvent type) on the photoluminescence properties of the spray-deposited ZnO nanorods. A dominant near band edge (NBE) emission is observed at 300 K and at 10 K. High-resolution photoluminescence measurements at 10 K reveal fine structure of the NBE band with the dominant peaks related to the bound exciton transitions. It is found that all studied technological parameters affect the excitonic photoluminescence in ZnO nanorods.PACS: 78.55.Et, 81.15.Rs, 61.46.Km.

No MeSH data available.


Related in: MedlinePlus

Raman spectrum of ZnO nanorod layer deposited by chemical spray pyrolysis. The layer was deposited onto ITO/SGL substrate at growth temperature of 550°C, using aqueous solvent. SEM image of the corresponding ZnO nanorod sample is presented in Figure 3a. The Raman spectrum of the ITO/SGL substrate is shown with the dashed line.
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Figure 2: Raman spectrum of ZnO nanorod layer deposited by chemical spray pyrolysis. The layer was deposited onto ITO/SGL substrate at growth temperature of 550°C, using aqueous solvent. SEM image of the corresponding ZnO nanorod sample is presented in Figure 3a. The Raman spectrum of the ITO/SGL substrate is shown with the dashed line.

Mentions: Typical XRD pattern of sprayed ZnONRL is presented in Figure 1. According to XRD, the as-grown ZnONRL are highly c-axis-oriented hexagonal (wurtzite) ZnO structures. The Raman spectrum of as-deposited ZnONRL is presented in Figure 2. Raman peaks located at 99 and 438 cm-1 with a fitted excitonic peak widths (FWHM) of 1.2 and 6.1 cm-1, respectively, are dominant ones. Raman peaks at 99, 438, and 379 cm-1 are attributed to the E2(low), E2(high), and A1(TO) Raman modes of wurtzite phase of ZnO, respectively [26]. The Raman peak at approximately 580 cm-1 which is correlated to VO and/or Zni defects [27] is not observed. The peaks at 128, 330, and 1,153 cm-1 are due to the second order or multiple phonon scattering of the Raman modes of the ZnO wurtzite structure, observed by other authors as well [28]. The sharp Raman peaks characteristic of the wurtzite phase and the absence of defect-induced Raman peaks is an indication of a high-quality crystalline material. According to EDS analysis, the O/Zn atomic ratio in ZnONRL is ca. 1.5. The excess of oxygen (compared to the stoichiometric ZnO) as well as the presence of In, Sn, and Si signal in the EDS spectra (not presented), originates from the ITO/SGL substrate. Other elements are not detected by the EDS.


Photoluminescence of spray pyrolysis deposited ZnO nanorods.

Kärber E, Raadik T, Dedova T, Krustok J, Mere A, Mikli V, Krunks M - Nanoscale Res Lett (2011)

Raman spectrum of ZnO nanorod layer deposited by chemical spray pyrolysis. The layer was deposited onto ITO/SGL substrate at growth temperature of 550°C, using aqueous solvent. SEM image of the corresponding ZnO nanorod sample is presented in Figure 3a. The Raman spectrum of the ITO/SGL substrate is shown with the dashed line.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211449&req=5

Figure 2: Raman spectrum of ZnO nanorod layer deposited by chemical spray pyrolysis. The layer was deposited onto ITO/SGL substrate at growth temperature of 550°C, using aqueous solvent. SEM image of the corresponding ZnO nanorod sample is presented in Figure 3a. The Raman spectrum of the ITO/SGL substrate is shown with the dashed line.
Mentions: Typical XRD pattern of sprayed ZnONRL is presented in Figure 1. According to XRD, the as-grown ZnONRL are highly c-axis-oriented hexagonal (wurtzite) ZnO structures. The Raman spectrum of as-deposited ZnONRL is presented in Figure 2. Raman peaks located at 99 and 438 cm-1 with a fitted excitonic peak widths (FWHM) of 1.2 and 6.1 cm-1, respectively, are dominant ones. Raman peaks at 99, 438, and 379 cm-1 are attributed to the E2(low), E2(high), and A1(TO) Raman modes of wurtzite phase of ZnO, respectively [26]. The Raman peak at approximately 580 cm-1 which is correlated to VO and/or Zni defects [27] is not observed. The peaks at 128, 330, and 1,153 cm-1 are due to the second order or multiple phonon scattering of the Raman modes of the ZnO wurtzite structure, observed by other authors as well [28]. The sharp Raman peaks characteristic of the wurtzite phase and the absence of defect-induced Raman peaks is an indication of a high-quality crystalline material. According to EDS analysis, the O/Zn atomic ratio in ZnONRL is ca. 1.5. The excess of oxygen (compared to the stoichiometric ZnO) as well as the presence of In, Sn, and Si signal in the EDS spectra (not presented), originates from the ITO/SGL substrate. Other elements are not detected by the EDS.

Bottom Line: A dominant near band edge (NBE) emission is observed at 300 K and at 10 K.High-resolution photoluminescence measurements at 10 K reveal fine structure of the NBE band with the dominant peaks related to the bound exciton transitions.It is found that all studied technological parameters affect the excitonic photoluminescence in ZnO nanorods.PACS: 78.55.Et, 81.15.Rs, 61.46.Km.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Materials Science, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia. malle@staff.ttu.ee.

ABSTRACT
Photoluminescence of highly structured ZnO layers comprising well-shaped hexagonal rods is presented. The ZnO rods (length 500-1,000 nm, diameter 100-300 nm) were grown in air onto a preheated soda-lime glass (SGL) or ITO/SGL substrate by low-cost chemical spray pyrolysis method using zinc chloride precursor solutions and growth temperatures in the range of 450-550°C. We report the effect of the variation in deposition parameters (substrate type, growth temperature, spray rate, solvent type) on the photoluminescence properties of the spray-deposited ZnO nanorods. A dominant near band edge (NBE) emission is observed at 300 K and at 10 K. High-resolution photoluminescence measurements at 10 K reveal fine structure of the NBE band with the dominant peaks related to the bound exciton transitions. It is found that all studied technological parameters affect the excitonic photoluminescence in ZnO nanorods.PACS: 78.55.Et, 81.15.Rs, 61.46.Km.

No MeSH data available.


Related in: MedlinePlus