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Surface recombinati...
Surface recombination in ZnO nanorods grown by chemical bath deposition
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- Zhao, Qingxiang (författare)
- Linköpings universitet,Tekniska högskolan,Fysik och elektroteknik
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- Yang, Li-Li, 1980- (författare)
- Linköpings universitet,Institutionen för teknik och naturvetenskap,Tekniska högskolan
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- Sernelius, Bo (författare)
- Linköpings universitet,Tekniska högskolan,Teoretisk Fysik
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- Holtz, Per-Olof (författare)
- Linköpings universitet,Tekniska högskolan,Halvledarmaterial
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- Willander, Magnus (författare)
- Linköpings universitet,Tekniska högskolan,Fysik och elektroteknik
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(creator_code:org_t)
- AIP Publishing, 2008
- 2008
- Engelska.
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Ingår i: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 104:7, s. 073526-
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Abstract
Ämnesord
Stäng
- Verticallywell-aligned ZnO nanorods on Si substrates were prepared by atwo-step chemical bath deposition (CBD) method. The optical properties ofthe grown ZnO nanorods were investigated by time resolved photoluminescencespectroscopy. It was found that the effective decay time ofthe near bandgap recombination in the CBD grown ZnO nanorodsstrongly depends on the diameter of the ZnO nanorods. Typically,the decay curves obtained from these ZnO nanorods show acombination of two exponential decays. The experimental results show thatthe fast exponential decay is related to the surface recombinationand the slow decay is related to the “bulk” decay.The measured decay time of the effective surface recombination decreaseswith decreasing diameter, while the bulk decay time remains unchanged.The results also show that an annealing treatment around 500 °Csignificantly reduces the surface recombination rate. A simple carrier andexciton diffusion equation is also used to determine the surfacerecombination velocity, which results in a value between 1.5 and4.5 nm/ps.
Ämnesord
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Nyckelord
- Annealing
- excitons
- II-VI semiconductors
- nanostructured materials
- nanotechnology
- photoluminescence
- semiconductor growth
- surface recombination
- time resolved spectra
- wide band gap semiconductors
- zinc compounds
- Optical physics
- Optisk fysik
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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