scholarly journals Fabrication and Characterization of High-Quality UV Photodetectors Based ZnO Nanorods Using Traditional and Modified Chemical Bath Deposition Methods

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 677
Author(s):  
Ahmed Fattah Abdulrahman ◽  
Sabah Mohammed Ahmed ◽  
Azeez Abdullah Barzinjy ◽  
Samir Mustafa Hamad ◽  
Naser Mahmoud Ahmed ◽  
...  
Keyword(s):  
Growth Rate ◽  
Aspect Ratio ◽  
Chemical Bath Deposition ◽  
Zno Nanorods ◽  
High Quality ◽  
Uv Photodetectors ◽  
X Ray ◽  
Double Beam ◽  
Cbd Method ◽  
The Impact

Ultraviolet (UV) photodetectors (PDs) based on high-quality well-aligned ZnO nanorods (NRs) were fabricated using both modified and conventional chemical bath deposition (CBD) methods. The modified chemical bath deposition (M-CBD) method was made by adding air bubbles to the growth solution during the CBD process. The viability and effectiveness of M-CBD were examined by developing UV PDs based on ZnO NRs. The ZnO nano-seed layer was coated on a glass substrate utilizing radiofrequency (RF) sputtering. The impact of the different growth-times on morphology, growth rate, crystal structure, and optical and chemical properties were investigated systematically using different characterization techniques, such as field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD) analysis, UV–VIS double beam spectrometer, and energy dispersive X-ray analysis (EDX), respectively. The Al/ZnO UV PDs based on ZnO nanorods were fabricated with optimum growth conditions through the two methods of preparation. This study showed that the synthesized ZnO NRs using the M-CBD method for different growth times possess better properties than the conventional method under similar deposition conditions. Despite having the highest aspect ratio and growth rate of ZnO NRs, which were found at 4 h growth duration for both methods, the aspect ratio of ZnO NRs using the M-CBD technique was comparatively higher than the conventional CBD method. Besides, the UV PDs fabricated by the M-CBD method at 5 V bias voltage showed high sensitivity, short response time, quick recovery time, high gain, low dark current, and high photocurrent compared with the UV PD device fabricated by the conventional CBD method.

scholarly journals Enhancement of ZnO Nanorods Properties Using Modified Chemical Bath Deposition Method: Effect of Precursor Concentration

Crystals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 386
Author(s):  
Ahmed Fattah Abdulrahman ◽  
Sabah Mohammed Ahmed ◽  
Naser Mahmoud Ahmed ◽  
Munirah Abullah Almessiere
Keyword(s):  
Growth Rate ◽  
Chemical Bath Deposition ◽  
Zno Nanorods ◽  
Precursor Concentration ◽  
Favorable Result ◽  
Optical Studies ◽  
Modified Method ◽  
Aspect Ratios ◽  
Conventional Methods ◽  
Cbd Method

In this study, the effects of different precursor concentrations on the growth and characteristics properties of the zinc oxide (ZnO) nanorods (NRs) synthesized by using modified and conventional chemical bath deposition (CBD) methods were investigated. The morphologic, structural and optical properties of synthesized ZnO NRs with different precursor concentrations were studied using various characterization techniques. The experimental results show that the varying precursor concentration of the reactants has a remarkable and significant effect on the growth and characteristics properties of ZnO NRs. In addition, the characteristic properties of ZnO NRs grown using the modified method showed significantly improved and enhanced properties. The average length of grown ZnO NRs increased with increased precursor concentration; it can be seen that longer ZnO NRs have been investigated using the modified CBD methods. The ZnO NRs synthesized at 0.05 M using the modified method were grown with high aspect ratios than the ZnO NRs grown using conventional means which were 25 and 11, respectively. The growth rate increased with increased precursor concentration; it can be observed that a higher growth rate was seen using the modification CBD method. Furthermore, XRD results for the two cases reveal that the grown ZnO samples were a nanorod-like in shape and possessed a hexagonal wurtzite structure with high crystal quality. No other phases from the impurity were observed. The diffraction peaks along (002) plane became higher, sharper and narrower as precursor concentration increased, suggesting that the crystalline quality of ZnO NRs grown using the modified method was more enhanced and better than conventional methods. However, optical studies show that the transmittance at each concentration was more than two times higher than the transmittance using the modified CBD method. In addition, optical studies demonstrated that the ZnO NRs grown by using modified and conventional methods had a direct Eg in the range of (3.2–3.26) eV and (3.15–3.19) eV, respectively. It was demonstrated in two methods that ZnO NRs grown at a precursor concentration 0.05 M gave the most favorable result, since the NRs had best characteristic properties.

Synthesis of Vertical ZnO Nanorods on Glass Substrates by Simple Chemical Method

2009 ◽  
Vol 5 ◽  
pp. 223-230 ◽  
Author(s):  
P. Suresh Kumar ◽  
M. Yogeshwari ◽  
A. Dhayal Raj ◽  
D. Mangalaraj ◽  
D. Nataraj ◽  
...  
Keyword(s):  
Deposition Time ◽  
Zno Nanorods ◽  
Sem Analysis ◽  
Growth Behavior ◽  
X Ray Diffraction ◽  
Zno Film ◽  
X Ray ◽  
Glass Substrates ◽  
Simple Chemical ◽  
Cbd Method

ZnO nanorods (NRs) have been synthesized by a chemical bath deposition (CBD) method on simple glass substrate that had been precoated by successive ionic layer absorption and reaction (SILAR) with a thin ZnO film. ZnO NR array was obtained by using zinc acetate and hexamethylenetetramine as aqueous solutions at optimized pH concentration and deposition time. X-ray diffraction (XRD) and SEM analysis were used to confirm the growth of ZnO nanorods. The pH and deposition time of the solution was found to influence the growth behavior of ZnO NRs. PL analysis also reflected the growth behavior of ZnO NRs.

Synthesis of ZnO Nanorods with Tunable Aspect Ratio

2012 ◽  
Vol 724 ◽  
pp. 205-208
Author(s):  
Li Yan Zhang ◽  
Fen Wang ◽  
Jian Feng Zhu
Keyword(s):  
Electron Microscopy ◽  
Aspect Ratio ◽  
Ph Value ◽  
Zno Nanorods ◽  
Heat Treating ◽  
X Ray Diffraction ◽  
X Ray ◽  
Preferred Direction ◽  
Transmission Electron ◽  
Scanning Electron

ZnO nanorods were prepared by heat treating of aqueous zinc acetate treated with organic of PVA. The products were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscopy (TEM). The results indicate that the as synthesized ZnO are hexagonal wurtzite nanorods with the maximum aspect ratio of 10:1 (100 nm in diameter and about 1 μm in length). The morphology of nanorods was formed by the regulation of appropriate organic under a pH value of 8.5. The growth mechanism of ZnO is proposed that the nanocrystals grow along a preferred direction in a growth tunnel provided by organics.

Deep UV Photodetectors fabricated from CVD Single Crystal Diamond

2009 ◽  
Vol 1203 ◽  
Author(s):  
Mose Bevilacqua ◽  
Richard B. Jackman
Keyword(s):  
Single Crystal ◽  
Surface Damage ◽  
High Quality ◽  
Uv Photodetectors ◽  
Single Crystal Diamond ◽  
Defect Passivation ◽  
Deep Uv ◽  
Passivation Treatment ◽  
Homoepitaxial Layers ◽  
The Impact

AbstractDeep UV detection using a single crystal diamond (SCD) substrate without a homoepitaxial layer has been demonstrated using a defect passivation treatment. Despite evidence of surface damage on the SCD, the treatments lead to highly effective photoconductive devices, displaying six-orders of discrimination between deep UV and visible light and a responsivity as high as 100A/W, equivalent to an external quantum efficiency of 700, similar to the best values for devices based on high quality homoepitaxial layers. Impedance spectroscopic investigations suggest that the treatment used reduces the impact of less resistive surface material, most likely defects left from substrate polishing.

Influence of Growth Conditions on Morphology of ZnO Nanorods by Low-Temperature Hydrothermal Method

2016 ◽  
Vol 675-676 ◽  
pp. 53-56
Author(s):  
Supawadee Pokai ◽  
Puenisara Limnonthakul ◽  
Mati Horprathum ◽  
Sukon Kalasung ◽  
Pitak Eiamchai ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Hydrothermal Method ◽  
Zno Nanorods ◽  
Cost Effective ◽  
Growth Conditions ◽  
Growth Time ◽  
Thermoelectric Device ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray

Zinc oxide (ZnO) nanorods (NRs) promise high potentials in several applications, such as photovoltaic device, thermoelectric device, sensor and solar cell. In this research, the vertical alignment of ZnO NRs was fabricated by hydrothermal method with various precursor concentrations and growth time on different seed layers (ZnO and Au), which deposited on silicon wafer substrate (100). The crystalline structure and morphology of ZnO NRs have been characterized by x-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM) techniques, respectively. The x-ray diffraction pattern shows that the prepared samples have a strong preferred orientation (002) plane. FE-SEM images of the ZnO NRs, it found that the density and aspect ratio were strongly influenced by the seed layer and precursor concentration. In addition, the aspect ratio of ZnO NRs was increased with increasing growth time. This study provides a cost effective method for the fabrication of well aligned ZnO NRs for nano-electronic devices.

Optical and Structural Properties of ZnO Nanorods Prepared by Chemical Bath Deposition Method

2013 ◽  
Vol 678 ◽  
pp. 207-211
Author(s):  
Jagadeesh Deenathayalan ◽  
Manickam Saroja ◽  
Muthusamy Venkatachalam ◽  
Periyasamy Gowthaman ◽  
N. Muthukumarasamy ◽  
...  
Keyword(s):  
Structural Properties ◽  
Chemical Bath Deposition ◽  
Zno Nanorods ◽  
Zinc Nitrate ◽  
Chemical Bath Deposition Method ◽  
Deposition Method ◽  
X Ray ◽  
Glass Substrates ◽  
Vis Spectroscopy ◽  
Different Temperatures

Abstract The Chemical bath deposition method was used for the preparation of ZnO nanorods and their optical and structural properties were studied. ZnO seed layer thin films were prepared by chemical bath deposition technique on to well cleaned glass substrates. ZnO seed-coated glass substrates were immersed in aqueous solution of zinc nitrate and hexamethylenetetramine (HMT) on 1:10 molar concentration at 90°C for 4 hours and annealed at different temperatures. The effect of annealing temperatures on the surface morphology and optical properties of the films was studied. The structure of the ZnO nano rod was studied by X-ray diffractometer and scanning electron microscopy. The optical property was studied by UV-Vis spectroscopy and photoluminescence spectroscopy. Experimental results have shown that prepared ZnO nanorods by this method have higher photoluminescence

Selective Area Heteroepitaxy of Nano-AlGaN UV Excitation Sources for Biofluorescence Application

2006 ◽  
Vol 916 ◽  
Author(s):  
Vibhu Jindal ◽  
James Grandusky ◽  
Fatemeh Shahedipour-Sandvik ◽  
Steven LeBoeuf ◽  
Joleyn Balch ◽  
...  
Keyword(s):  
Growth Rate ◽  
Growth Parameters ◽  
Growth Conditions ◽  
X Ray Diffraction ◽  
High Quality ◽  
X Ray ◽  
Selective Area ◽  
Mask Material ◽  
Uv Excitation ◽  
Selection Of

AbstractWe report on the selective area heteroepitaxy and facet evolution of AlGaN nanostructures on GaN/sapphire substrate using various mask materials. We also report on the challenges associated with selection of an appropriate mask material for selective area heteroepitaxy of AlGaN with varying Al composition. The shape and the growth rate of the nanostructures are observed to be greatly affected by the mask material. The evolution of the AlGaN nanostructures and Al incorporation were studied exhaustively as a function of growth parameters; including temperature, pressure, NH3 flow, total alkyl flow and TMAl/(TMAl+TMGa) ratio. The growth rate of nanostructures was reduced drastically when higher Al percentage AlGaN nanostructures were grown. The growth rates were increased for higher Al percentage AlGaN using a surfactant which resulted in a high quality pyramidal structure. As indicated by high resolution x-ray diffraction (XRD) and cathodoluminescence (CL) spectroscopy, composition of Al in the AlGaN nanostructure is significantly different from that of a thin film grown under the same growth conditions.

A Simple, One-step, Seedless Hydrothermal Growth of ZnO Nanorods on Printed Circuit Board Substrate

2017 ◽  
Vol 33 (2) ◽  
Author(s):  
Mai Hong Hanh ◽  
Nguyễn Việt Tuyên ◽  
Pham Van Thanh ◽  
Hoang Chi Hieu
Keyword(s):  
Printed Circuit Board ◽  
Cell Structure ◽  
Zno Nanorods ◽  
Cost Effective ◽  
Circuit Board ◽  
X Ray Diffraction ◽  
High Quality ◽  
X Ray ◽  
Printed Circuit ◽  
One Step

Abstract: High quality, high density, and well-aligned zinc oxide (ZnO) nanorods have been synthesized on cost-effective printed circuit board (PCB) substrates via a simple, seedless, one-step, low-temperature hydrothermal method based galvanic cell structure. It was found that the outer diameters of the ZnO nanorods range from 50 nm to 400 nm. The as-grown ZnO nanorods prefer to grow along the c axis. The morphologies of the ZnO nanorods were investigated by scanning electron microscope (SEM) and X-ray diffraction (XRD). The crystallinity properties were characterized by Raman spectroscopy and photoluminescence (PL) spectroscopy.

Synthesis of Ternary Semiconductor Silver Bismuth Telluride by Chemical Bath Deposition

2017 ◽  
Vol 751 ◽  
pp. 489-493 ◽  
Author(s):  
Patamaporn Termsaithong ◽  
Aphichart Rodchanarowan
Keyword(s):  
Chemical Bath Deposition ◽  
Bismuth Telluride ◽  
X Ray Diffraction ◽  
Solar Cell Application ◽  
X Ray ◽  
Rhombohedral Crystal Structure ◽  
Rhombohedral Crystal ◽  
Ternary Semiconductor ◽  
Cbd Method ◽  
Scanning Electron

In this study, the synthesis of the ternary semiconductor sensitized silver bismuth telluride (AgBiTe2: SBT) particles was produced in the solution of AgNO3, Bi (NO3)3×5H2O and Na2O3Te by using a chemical bath deposition (CBD) method and annealing at 200°C for 1 h. According to scanning electron microscopy (SEM), the particle size of SBT after annealing was bigger than before annealing. Based on X-ray diffraction, the SBT after annealing for 1h became more crystalline. In addition, the XRF data also demonstrated that the SBT powder consists of Ag, Bi, and Te as dominant elements. The XRD result confirms a successful growth of the SBT particles with rhombohedral crystal structure. Based on the obtaining results, the SBT particles were successfully synthesized and potentially applied for solar cell application.

Feasibility of ZnO and Zn Seed Layers for Growth of Vertically Aligned and High-Quality ZnO Nanorods by the Sonochemical Method

2019 ◽  
Vol 290 ◽  
pp. 267-273
Author(s):  
Nama A. Hammed ◽  
Azlan Abdul Aziz ◽  
Adamu Ibrahim Usman
Keyword(s):  
Electron Microscopy ◽  
Seed Layer ◽  
Zno Nanorods ◽  
Volume Ratio ◽  
Sonochemical Method ◽  
Adhesion Layer ◽  
High Quality ◽  
X Ray ◽  
Vertically Aligned ◽  
Seed Layers

The role of both zinc oxide (ZnO) and zinc (Zn) seed layers were evaluated for the growth of vertically aligned high-quality zinc oxide (ZnO) nanorods by the sonochemical method. A total of four samples categorized into two groups were evaluated, with a different type and thickness of seed layer for the first group - ZnO, 85 nm and the second group - Zn, 55 nm respectively. This was after depositing Ti (10 nm) as the adhesion layer on p-type Si (111) substrates for two samples, and without the adhesion layer on the others. All depositions were carried out using RF-sputtering. The effects of the seed layers on the growth of vertically aligned high-quality ZnO nanorods were systematically studied using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray (EDX) analysis and transmission electron microscopy (TEM). Results show that the type and thickness of a seed layer are key parameters to the synthesis of high quality ZnO nanorods. Results also show that the Ti (10 nm) adhesion layer did not affect the growth surface-to-volume ratio of the ZnO nanorods and the ZnO nanorods synthesized using ZnO (85 nm) as seed layer has a better surface-to-volume ratio compared to that using Zn (55 nm) as seed layer, with and without the adhesion layer.

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