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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.

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Normalized photoluminescence spectra of ZnO nanorod layers deposited using different solvents. The layers are deposited onto ITO/SGL substrate at 480°C from aqueous or alcoholic solution, illustrated by spectrum A and B, respectively. Spray rate is kept similar (2.2 ml/min). Spectrum A is shown with fitting results. SEM image of the sample corresponding to spectrum B is presented in Figure 3c.
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Figure 7: Normalized photoluminescence spectra of ZnO nanorod layers deposited using different solvents. The layers are deposited onto ITO/SGL substrate at 480°C from aqueous or alcoholic solution, illustrated by spectrum A and B, respectively. Spray rate is kept similar (2.2 ml/min). Spectrum A is shown with fitting results. SEM image of the sample corresponding to spectrum B is presented in Figure 3c.

Mentions: The effect of the use of different solvents on the PL properties of ZnONRL is presented as Figure 7. An exciton peak at 3.363 eV is observed only when aqueous solutions are used for deposition of ZnONRL. A shallow donor impurity corresponding to an excitonic peak at approximately 3.363 eV has been correlated to hydrogen impurity by many authors, see for example [29]. However, we can present no proof for hydrogen incorporation in this study, thus, it will not be considered further.


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)

Normalized photoluminescence spectra of ZnO nanorod layers deposited using different solvents. The layers are deposited onto ITO/SGL substrate at 480°C from aqueous or alcoholic solution, illustrated by spectrum A and B, respectively. Spray rate is kept similar (2.2 ml/min). Spectrum A is shown with fitting results. SEM image of the sample corresponding to spectrum B is presented in Figure 3c.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 7: Normalized photoluminescence spectra of ZnO nanorod layers deposited using different solvents. The layers are deposited onto ITO/SGL substrate at 480°C from aqueous or alcoholic solution, illustrated by spectrum A and B, respectively. Spray rate is kept similar (2.2 ml/min). Spectrum A is shown with fitting results. SEM image of the sample corresponding to spectrum B is presented in Figure 3c.
Mentions: The effect of the use of different solvents on the PL properties of ZnONRL is presented as Figure 7. An exciton peak at 3.363 eV is observed only when aqueous solutions are used for deposition of ZnONRL. A shallow donor impurity corresponding to an excitonic peak at approximately 3.363 eV has been correlated to hydrogen impurity by many authors, see for example [29]. However, we can present no proof for hydrogen incorporation in this study, thus, it will not be considered further.

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