Effect of Au Dopant on the Structural and Optical Properties of ZnO Thin Films Prepared by CVD

Najim, Suha A.; Jamil, Nawfal Y.; Muhammed, K. M.

doi:10.21272/jnep.11(2).02003

Cited by 6 publications

(3 citation statements)

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“…% Al. The obtained values of the band gap are in good agreement with the already established value of 3.35 eV reported in [10,11]. The electrical resistivity was calculated using a standard four-point probe method at a distance of s  2 mm according to the following equation [12]:…”

Section: Methodssupporting

confidence: 87%

Design of Al:ZnO/p-Si Heterojunction Solar Cell Using SCAPS Simulation Program

Najim¹,

Muhammed²,

Pogrebnjak³

2021

J. Nano- Electron. Phys.

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ZnO thin film is a prominent candidate to be used as a buffer layer in silicon solar cells. In this paper, the effect of Al concentrations (1, 5, 10 wt. %) on the conversion efficiency of Al:ZnO/Si thin film solar cells has been investigated through simulation by SCAPS program. It has been found that the main photovoltaic parameters such as open-circuit voltage, short-circuit current density, fill factor, conversion efficiency, quantum efficiency and ideality factor increased as Al enrichment occurred. At 10 wt. % of Al the optimum conversion efficiency was approximately 7 %, the maximum value of the ideality factor was 17.51, and the bandgap value was 3.56 eV. Additionally, the resistivity, carrier concentration and mobility were determined for all measurements. It has been found that a decrease in the Hall coefficient led to an increase in the carrier concentration with increasing Al content, while an increase in the mobility occurred due to a decrease in the electrical resistivity. The quantum efficiency of the solar cell measured at a wavelength in the range of 400-1000 nm was between 0.4-0.5.

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Section: Methodssupporting

confidence: 87%

Design of Al:ZnO/p-Si Heterojunction Solar Cell Using SCAPS Simulation Program

Najim¹,

Muhammed²,

Pogrebnjak³

2021

J. Nano- Electron. Phys.

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“…There is a probable reason for enhancing UV emission intensity in the ZnO: Au system. The adsorption of visible light by Au forms exciton–surface plasmon coupling that assists in effective electron transfer from Au to ZnO, enhancing UV emission intensity [ 45 , 48 , 49 , 50 , 51 ]. This observation corroborates our results.…”

Section: Resultsmentioning

confidence: 99%

Physical Characteristics, Blue-Green Band Emission and Photocatalytic Activity of Au-Decorated ZnO Quantum Dots-Based Thick Films Prepared Using the Doctor Blade Technique

Fatehmulla,

Shamsan,

El-Naggar

et al. 2023

Molecules

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Nanoscale ZnO is a vital semiconductor material whose versatility can be enhanced by sensitizing it with metals, especially noble metals, such as gold (Au). ZnO quantum dots were prepared via a simple co-precipitation technique using 2-methoxy ethanol as the solvent and KOH as the pH regulator for hydrolysis. The synthesized ZnO quantum dots were deposited onto glass slides using a simple doctor blade technique. Subsequently, the films were decorated with gold nanoparticles of different sizes using a drop-casting method. The resultant films were characterized via various strategies to obtain structural, optical, morphological, and particle size information. The X-ray diffraction (XRD) reveals the formation of the hexagonal crystal structure of ZnO. Upon Au nanoparticles loading, peaks due to gold are also observed. The optical properties study shows a slight change in the band gap due to Au loading. Nanoscale sizes of particles have been confirmed through electron microscope studies. P.L. studies display blue and blue-green band emissions. The significant degradation efficiency of 90.2% methylene blue (M.B.) was attained in natural pH in 120 min using pure ZnO catalyst while one drop gold-loaded catalysts, ZnO: Au 5 nm, ZnO: Au 7 nm, ZnO: Au 10 nm and ZnO: Au 15 nm, delivered M.B. degradation efficiency of 74.5% (in 245 min), 63.8% (240 min), 49.6% (240 min) and 34.0% (170 min) in natural pH, respectively. Such films can be helpful in conventional catalysis, photocatalysis, gas sensing, biosensing, and photoactive applications.

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“…As mentioned before, the incorporation of gold into nanowires cannot be excluded, especially considering the solubility of Au in ZnO that may be achieved in specific conditions such as deposition at high pressure and growth temperature, annealing at high temperature and gold content [ 34 , 35 ]. However, the solubility and the chemical state of ZnO (Au) are still not clear according to the few reports in literature [ 35 ].…”

Section: Resultsmentioning

confidence: 99%

One Dimensional ZnO Nanostructures: Growth and Chemical Sensing Performances

et al. 2020

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Recently, one-dimensional (1D) nanostructures have attracted the scientific community attention as sensitive materials for conductometric chemical sensors. However, finding facile and low-cost techniques for their production, controlling the morphology and the aspect ratio of these nanostructures is still challenging. In this study, we report the vapor-liquid-solid (VLS) synthesis of one dimensional (1D) zinc oxide (ZnO) nanorods (NRs) and nanowires (NWs) by using different metal catalysts and their impact on the performances of conductometric chemical sensors. In VLS mechanism, catalysts are of great interest due to their role in the nucleation and the crystallization of 1D nanostructures. Here, Au, Pt, Ag and Cu nanoparticles (NPs) were used to grow 1D ZnO. Depending on catalyst nature, different morphology, geometry, size and nanowires/nanorods abundance were established. The mechanism leading to the VLS growth of 1D ZnO nanostructures and the transition from nanorods to nanowires have been interpreted. The formation of ZnO crystals exhibiting a hexagonal crystal structure was confirmed by X-ray diffraction (XRD) and ZnO composition was identified using transmission electron microscopy (TEM) mapping. The chemical sensing characteristics showed that 1D ZnO has good and fast response, good stability and selectivity. ZnO (Au) showed the best performances towards hydrogen (H2). At the optimal working temperature of 350 °C, the measured response towards 500 ppm of H2 was 300 for ZnO NWs and 50 for ZnO NRs. Moreover, a good selectivity to hydrogen was demonstrated over CO, acetone and ethanol.

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Effect of Au Dopant on the Structural and Optical Properties of ZnO Thin Films Prepared by CVD

Cited by 6 publications

References 0 publications

Design of Al:ZnO/p-Si Heterojunction Solar Cell Using SCAPS Simulation Program

Design of Al:ZnO/p-Si Heterojunction Solar Cell Using SCAPS Simulation Program

Physical Characteristics, Blue-Green Band Emission and Photocatalytic Activity of Au-Decorated ZnO Quantum Dots-Based Thick Films Prepared Using the Doctor Blade Technique

One Dimensional ZnO Nanostructures: Growth and Chemical Sensing Performances

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