Synthesis and characterization of ZnO/TiO2 composite core/shell nanorod arrays by sol–gel method for organic solar cell applications

ZnO/TiO 2 core/shell nanorod arrays were deposited on indium tin oxide (ITO) substrate via a facile sol–gel dip-coating process. Effects of solution pH for ZnO, annealing temperature, growth time and temperature on the physical properties of nanorods have been investigated. X-ray diffraction (XRD) a...

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Bibliographic Details
Published in:Bulletin of materials science 2015-06, Vol.38 (3), p.617-623
Main Authors: AHMADI, K, ZIABARI, ALI ABDOLAHZADEH, MIRABBASZADEH, K, SHAL, A AHADPOUR
Format: Article
Language:English
Subjects:
Anatase
Annealing
Aqueous solutions
Arrays
Chemical composition
Chemistry and Materials Science
Core-shell structure
Dip coatings
Efficiency
Electrical properties
Electrical resistivity
Electrodes
Electron transport
Engineering
Ethanol
Glass substrates
Immersion coating
Indium tin oxides
Materials Science
Nanoparticles
Nanorods
Nanostructured materials
Optical properties
Photovoltaic cells
Physical properties
Scanning electron microscopy
Sol-gel processes
Solar cells
Substrates
Thin films
Titanium dioxide
Wurtzite
X-ray diffraction
Zinc oxide
Zinc oxides
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Summary:ZnO/TiO 2 core/shell nanorod arrays were deposited on indium tin oxide (ITO) substrate via a facile sol–gel dip-coating process. Effects of solution pH for ZnO, annealing temperature, growth time and temperature on the physical properties of nanorods have been investigated. X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM) were employed to characterize the structural and morphological properties of the prepared composite nanorods. XRD result revealed wurtzite structure of ZnO with a mixed anatase and rutile structure phase for TiO 2 . Energy-dispersive X-ray (EDX) and UV–vis spectroscopy were used to study the chemical composition and optical properties of the films, respectively. Electrical resistivity of the films was also investigated. The optical and electrical properties of the bare TiO 2 thin film and core/shell composite were compared together. The results showed that owing to smaller band gap and lower resistivity, the core/shell structure as an electron transport layer for inverted photovoltaic devices is more suitable than bare TiO 2 thin film.
ISSN:0250-4707
0973-7669
DOI:10.1007/s12034-015-0898-8