Tunable photoluminescence properties of well-aligned ZnO nanorod array by oxygen plasma post-treatment

Jiang, Shan; Ren, Zhaohui; Gong, Sha; Yin, Simin; Yu, Yifeng; Li, Xiang; Xu, Gang; Shen, Ge; Han, Gaorong

doi:10.1016/j.apsusc.2013.10.146

Cited by 38 publications

(23 citation statements)

References 33 publications

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“…Intensities of the other peaks are rather low than (002) peak for each sample and intensities of the other peaks for ZRSC are lower than ZRCBD. The obtained single crystalline wurtzite ZnO structure is in good agreement with the literature [19,20]. Additionally, it is reported that 2 theta degree of (002) peak for ZnO hydrophobic film growth by using CBD is identified between 50° -55° with highly intensity [19].…”

Section: Methodssupporting

confidence: 87%

A Comparative Study on Structural and Optical Properties of ZnO Micro-Nanorod Arrays Grown on Seed Layers Using Chemical Bath Deposition and Spin Coating Methods

Karadeniz¹,

Çırak²,

Kılınç³

et al. 2016

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In this study, Zinc Oxide (ZnO) seed layers were prepared on Indium Tin Oxide (ITO) substrates by using Chemical Bath Deposition (CBD) method and Sol-gel Spin Coating (SC) method. ZnO micro-nanorod arrays were grown on ZnO seed layers by using Hydrothermal Synthesis method. Seed layer effects of structural and optical properties of ZnO arrays were characterized. X-ray diffractometer (XRD), Scanning Electron Microscopy (SEM) and Ultraviolet Visible (UV-Vis) Spectrometer were used for analyses. ZnO micro-nanorod arrays consisted of a single crystalline wurtzite ZnO structure for each seed layer. Besides, ZnO rod arrays were grown smoothly and vertically on SC seed layer, while ZnO rod arrays were grown randomly and flower like structures on CBD seed layer. The optical absorbance peaks found at 422 nm wavelength in the visible region for both ZnO arrays. Optical bandgap values were determined by using UV-Vis measurements at 3.12 and 3.15 eV for ZnO micro-nanorod arrays on CBD seed layer and for ZnO micro-nanorod arrays on SC-seed layer respectively.

show abstract

Section: Methodssupporting

confidence: 87%

A Comparative Study on Structural and Optical Properties of ZnO Micro-Nanorod Arrays Grown on Seed Layers Using Chemical Bath Deposition and Spin Coating Methods

Karadeniz¹,

Çırak²,

Kılınç³

et al. 2016

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show abstract

“…The UV emission is known to be caused by the band-to-band excitonic recombination which is highly pronounced when the density of defects causing the intra-band transitions is suppressed. The visible emissions, on the other hand, are associated with deep-level emissions (DLEs) and are due to the recombination of photo-generated carriers with various types of intrinsic defects such as oxygen/zinc vacancies, interstitials, and anti-sites [ 5 , 14 , 15 , 16 , 17 , 18 ]. As shown in the spectra, the UV emissions from the NRs were greatly influenced by the O 2 -plasma treatment for the SL.…”

Section: Resultsmentioning

confidence: 99%

“…The origin of each DLE in the visible band is still one of controversial topics because these emissions are due to many complicated intra-band carrier transitions related to various defect states in nanostructure ZnO material. However, in the case of ZnO nanocrystals prepared by solution-based methods such as our hydrothermal growth, hydroxyl groups or oxygenated carbon/hydrogen impurities, which are very difficult to eliminate in general, are known to be the source defects contributing to these DLEs [ 17 , 18 , 19 , 20 ]. As we increased the plasma-treatment time up to 9 min, these visible emission peaks from the NR crystals showed reduction in intensity but increased again with the treatment time intervals above 9 min, as depicted in Figure 2 b.…”

Section: Resultsmentioning

confidence: 99%

Induced Photonic Response of ZnO Nanorods Grown on Oxygen Plasma-Treated Seed Crystallites

et al. 2018

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We examined the influence of O2 plasma treatment for the ZnO seed layer (SL) crystallites on the material characteristics of ZnO nanorods (NRs) synthesized by the hydrothermal method. Diode photocurrent and photo-response transient characteristics of the p-Si/n-ZnO-NR heterojunction-based ultraviolet (UV) photodetectors were also examined according to the plasma treatment for the SLs. The superior optical properties of NRs were measured from the photoluminescence by exhibiting 4.6 times greater near-band edge emission when grown on the O2-plasma-treated SL. The degree of (002) orientation of the NR crystals was improved from 0.67 to 0.95, as revealed by X-ray diffraction analysis, and a higher NR surface density of ~80 rods/μm2 with a smaller mean diameter of 65 nm were also observed by the SL modification using plasma-treatment. It was shown by X-ray photo-electron spectroscopy that this improvement of NR crystalline quality was due to the recovery of stoichiometric oxygen with significant reduction of oxygenated impurities in the SL crystals and the subsequent low-energy growth mode for the NRs. UV PDs fabricated by the proposed SL plasma treatment technique showed significantly enhanced UV-to-dark current ratio from 2.0 to 83.7 at a forward bias of +5 V and faster photo-response characteristics showing the reduction in recovery time from 16 s to 9 s.

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“…Lord also found that surface state modulation through wet chemical treatment effectively reduced the surface potential barrier and achieved more controllable electrical properties of ZnO nanowires. Jiang and co-workers also reduced the width of the depletion region on the nanowire surface via O 2 plasma post-treatment [34].…”

Section: Introductionmentioning

confidence: 95%

ZnO:Ga nanowires with low turn-on field for field-emission lighting

Yang

Tsai

Lin

et al. 2015

Applied Surface Science

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Tunable photoluminescence properties of well-aligned ZnO nanorod array by oxygen plasma post-treatment

Cited by 38 publications

References 33 publications

A Comparative Study on Structural and Optical Properties of ZnO Micro-Nanorod Arrays Grown on Seed Layers Using Chemical Bath Deposition and Spin Coating Methods

A Comparative Study on Structural and Optical Properties of ZnO Micro-Nanorod Arrays Grown on Seed Layers Using Chemical Bath Deposition and Spin Coating Methods

Induced Photonic Response of ZnO Nanorods Grown on Oxygen Plasma-Treated Seed Crystallites

ZnO:Ga nanowires with low turn-on field for field-emission lighting

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