Effects of the annealing duration of the ZnO buffer layer on structural and optical properties of ZnO rods grown by a hydrothermal process

Shin, Chee Mahn; Lee, J.Y.; Heo, J.H.; Park, J.H.; Kim, C.R.; Ryu, Hyukhyun; Chang, Jiho; Son, Chang-Sik; Lee, W.J.; Tan, Swee Tiam; Zhao, Jun; Sun, Xiao Wei

doi:10.1016/j.apsusc.2009.06.004

Cited by 32 publications

(13 citation statements)

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“…The result may be due to the release of intrinsic strain induced by the presence of residual strain resulting from imperfections within the crystalline lattice, including vacancies, stacking faults, and interstitials. According to Shin et al [7], the lattice mismatch between ZnO film and Si-substrate causes structural defects. Thus, annealing the ZnO film deposited on Si-substrate removes the intrinsic strain because the Zn and O atoms are perfectly stacked in order.…”

Section: Resultsmentioning

confidence: 99%

Structural and Morphology of ZnO Nanorods Synthesized Using ZnO Seeded Growth Hydrothermal Method and Its Properties as UV Sensing

et al. 2012

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In this study, zinc oxide (ZnO) nanorod arrays were synthesized using a simple hydrothermal reaction on ZnO seeds/n-silicon substrate. Several parameters were studied, including the heat-treatment temperature to produce ZnO seeds, zinc nitrate concentration, pH of hydrothermal reaction solution, and hydrothermal reaction time. The optimum heat-treatment temperature to produce uniform nanosized ZnO seeds was 400°C. The nanorod dimensions depended on the hydrothermal reaction parameters. The optimum hydrothermal reaction parameters to produce blunt tip-like nanorods (770 nm long and 80 nm in top diameter) were 0.1 M zinc nitrate, pH 7, and 4 h of growth duration. Phase analysis studies showed that all ZnO nanorods exhibited a strong (002) peak. Thus, the ZnO nanorods grew in a c-axis preferred orientation. A strong ultraviolet (UV) emission peak was observed for ZnO nanorods grown under optimized parameters with a low, deep-level emission peak, which indicated high optical property and crystallinity of the nanorods. The produced ZnO nanorods were also tested for their UV-sensing properties. All samples responded to UV light but with different sensing characteristics. Such different responses could be attributed to the high surface-to-volume ratio of the nanorods that correlated with the final ZnO nanorods morphology formed at different synthesis parameters. The sample grown using optimum synthesis parameters showed the highest responsivity of 0.024 A/W for UV light at 375 nm under a 3 V bias.

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Section: Resultsmentioning

confidence: 99%

Structural and Morphology of ZnO Nanorods Synthesized Using ZnO Seeded Growth Hydrothermal Method and Its Properties as UV Sensing

et al. 2012

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“…By contrast, Chemical Vapour Deposition, has been poorly investigated despite it represents a low cost, viable, easily and tuneable, conformal route. Some systematic studies have investigated effects of thermal annealing treatments of MOCVD ZnO buffer layers in the perspective of improving the properties of the subsequently deposited CBD ZnO main layer [16,17]. Nevertheless, systematic effects upon varying MOCVD parameters have not been scrutinised.…”

Section: Zno Buffer Layer Mocvd Depositionmentioning

confidence: 99%

“…Similarly, the decomposition of zinc acetate has been proposed to produce nucleation sites for ZnO nanowires [8,9]. Moreover, it has been shown that pre-coating of glass and silicon substrates via sol-gel/spin coating [9][10][11][12][13], annealing of either Radio Frequency (RF) sputtered [14] or Metal-Organic Chemical Vapour Deposition (MOCVD) [15][16][17] deposited seed layers enhances texturing and crystallinity and is crucial for the formation of aligned ZnO nanowire/nanorod overlayers with improved properties.…”

Section: Introductionmentioning

confidence: 99%

Effects of Metal-Organic Chemical Vapour Deposition grown seed layer on the fabrication of well aligned ZnO nanorods by Chemical Bath Deposition

Fragalà

Aleeva²,

Malandrino

2011

Thin Solid Films

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Well aligned, long and uniform ZnO nanorods have been reproducibly fabricated adopting a two-steps Metal-Organic Chemical Vapour Deposition (MOCVD) and Chemical Bath Deposition (CBD) fabrication approaches. Thin (<100 nm) ZnO buffer layers have been seeded on silicon substrates by MOCVD and ZnO layers have been subsequently grown, in form of well textured nanorods, using CBD. It has been found that the structure and thickness of the seed layer strongly influence the final morphology and the crystal texturing of ZnO nanorods as well as the CBD growth rate. There is, in addition, a strong correlation between morphologies of CBD grown ZnO nanorods and those of the seed layer underneath. Thus, nanorods deposited over low temperature MOCVD buffer layers are less homogeneous in lateral dimensions and poorly vertically oriented. On the contrary, higher temperature nano-dimensional ZnO seeds favour the CBD growth of almost mono-dimensional homologue nanorods, with an adequate control of the lateral transport of matter. The nanorod aspect ratio values decrease upon increasing the deposition temperatures of the seed layers. Moreover, the nanorods length can be tailored either by adjusting the CBD growth time or by changing concentration of the N,N,N',N'-tetramethylethylenediamine ligand used in the CBD process. In particular, at high concentrations, the CBD process is faster with a greater global aspect ratio in agreement with a preferential one-dimensional growth of the ZnO nanostructures. Finally, these ZnO nanorod arrays possess good optical quality in accordance to the photoluminescence properties

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“…12 Temperature also plays an important role in the formation of TiO 2 thin films, as it determines the nucleation and growth of nanostructures. 13 There are few works were carried out on the influence of molarity on the TiO 2 thin films and study the effects on structural, optical and electrical properties of films with optimized conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of molarity on sol–gel routed nano TiO₂thin films

Lourduraj¹,

Williams²

2017

J. Adv. Dielect.

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The nanostructured titanium dioxide (TiO[Formula: see text] thin films have been prepared for the molar concentrations of titanium tetra isopropoxide (TTIP) 0.05[Formula: see text]M, 0.1[Formula: see text]M, 0.15[Formula: see text]M and 0.2[Formula: see text]M by sol–gel routed spin coating technique with calcination at 450[Formula: see text]C. The processing parameters such as, pH value (8), catalyst HCl (0.1[Formula: see text]ml), spin speed (3000[Formula: see text]rpm) and calcination temperature (450[Formula: see text]C) are optimized. The crystalline nature and surface morphology were analyzed by XRD, SEM and AFM analysis. The XRD results confirm that the films are crystalline with anatase phase, and are nanostructured. The SEM micrographs of the TiO2 film reveal the spherical nature of the particle. AFM analysis establishes that the uniformity of the TiO2 thin film was optimized at 0.2[Formula: see text]M. The optical measurements show that the transmittance depends on the molarity, and the optical band gap energy of TiO2 films is found to be inversely proportional to molarity. The I–V characteristics exhibit that the molarity strongly influences the electrical conductivity of the film. The results indicate that the significant effect of molarity on structural, optical and electrical properties of the nanostructured TiO2 thin films will be useful to photovoltaic application.

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Effects of the annealing duration of the ZnO buffer layer on structural and optical properties of ZnO rods grown by a hydrothermal process

Cited by 32 publications

References 33 publications

Structural and Morphology of ZnO Nanorods Synthesized Using ZnO Seeded Growth Hydrothermal Method and Its Properties as UV Sensing

Structural and Morphology of ZnO Nanorods Synthesized Using ZnO Seeded Growth Hydrothermal Method and Its Properties as UV Sensing

Effects of Metal-Organic Chemical Vapour Deposition grown seed layer on the fabrication of well aligned ZnO nanorods by Chemical Bath Deposition

Effect of molarity on sol–gel routed nano TiO₂thin films

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Effects of the annealing duration of the ZnO buffer layer on structural and optical properties of ZnO rods grown by a hydrothermal process

Cited by 32 publications

References 33 publications

Structural and Morphology of ZnO Nanorods Synthesized Using ZnO Seeded Growth Hydrothermal Method and Its Properties as UV Sensing

Structural and Morphology of ZnO Nanorods Synthesized Using ZnO Seeded Growth Hydrothermal Method and Its Properties as UV Sensing

Effects of Metal-Organic Chemical Vapour Deposition grown seed layer on the fabrication of well aligned ZnO nanorods by Chemical Bath Deposition

Effect of molarity on sol–gel routed nano TiO2thin films

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Effect of molarity on sol–gel routed nano TiO₂thin films