Sol–gel synthesis of ZnO–SiO2 thin films: impact of ZnO contents on its photonic efficiency

Ali, Atif Mossad; Ismail, Adel A.; Bouzid, Houcine; Harraz, Farid A.

doi:10.1007/s10971-014-3351-3

Cited by 15 publications

(7 citation statements)

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“…In fact, the peak at 931 cm –1 is the characteristic peak of Zn 2 SiO 4 . The peaks marked by dashed lines “ a ” and “ b ” located at ∼573 and ∼611 cm –1 , respectively, can be assigned to the asymmetric stretching modes of ZnO 4 in the Zn 2 SiO 4 crystal, , while the peak at ∼1097 cm –1 (indicated by dashed line “ c ”) can be attributed to the Si–O–Si stretching mode. − Moreover, a peak at ∼567 cm –1 was previously reported as the characteristic absorption peak of the Zn–O stretching mode. , Looking at Figure , it is therefore clear that the peak at ∼567 cm –1 up to 700 °C arises from the vibrational mode of ZnO 4 , whereas it is drastically suppressed in the presence of crystalline Zn 2 SiO 4 , from ZS-9A. However, the presence of two other transmittance peaks indicated by dashed lines “ d ” and “ e ” at ∼778 and 816 cm –1 can be assigned to the TO and LO modes of SiC, respectively .…”

Section: Resultsmentioning

confidence: 86%

“…59−61 Moreover, a peak at ∼567 cm −1 was previously reported as the characteristic absorption peak of the Zn−O stretching mode. 28,29 Looking at Figure 8, it is therefore clear that the peak at ∼567 cm −1 up to 700 °C arises from the vibrational mode of ZnO 4 , 57 whereas it is drastically suppressed in the presence of crystalline Zn 2 SiO 4 57,58 from ZS-9A. However, the presence of two other transmittance peaks indicated by dashed lines "d" and "e" at ∼778 and 816 cm −1 can be assigned to the TO and LO modes of SiC, respectively.…”

Section: ■ Results and Discussionmentioning

confidence: 98%

“…In fact, the peak at 931 cm –1 is the characteristic peak of Zn 2 SiO 4 . 56 The peaks marked by dashed lines “ a ” and “ b ” located at ∼573 and ∼611 cm –1 , respectively, can be assigned to the asymmetric stretching modes of ZnO 4 in the Zn 2 SiO 4 crystal, 57 , 58 while the peak at ∼1097 cm –1 (indicated by dashed line “ c ”) can be attributed to the Si–O–Si stretching mode. 59 − 61 Moreover, a peak at ∼567 cm –1 was previously reported as the characteristic absorption peak of the Zn–O stretching mode.…”

Section: Resultsmentioning

confidence: 99%

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Tailoring Structural, Chemical, and Photocatalytic Properties of ZnO@β-SiC Composites: The Effect of Annealing Temperature and Environment

et al. 2023

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For achieving unified functionalities of rare-earth free materials, the development of innovative zinc oxide and β-silicon carbide (ZnO@β-SiC) composites by a solid-state reaction method is presented. The evolution of zinc silicate (Zn2SiO4) is evidenced by X-ray diffraction when annealed in air beyond 700 °C. Detailed X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy analyses reveal the involvement of silicon dioxide in forming Zn2SiO4. Transmission electron microscopy and the associated energy-dispersive X-ray spectroscopy elucidate the evolution of the zinc silicate phase at the ZnO/β-SiC interface, though it can be averted by vacuum annealing. These results manifest the importance of air in oxidizing SiC before a chemical reaction with ZnO from 700 °C. Finally, ZnO@β-SiC composites are found to be promising for methylene blue dye degradation under ultraviolet radiation, but the annealing above 700 °C is detrimental due to the evolution of a potential barrier in the presence of Zn2SiO4 at the ZnO/β-SiC interface.

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Section: Resultsmentioning

confidence: 86%

Section: ■ Results and Discussionmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

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Tailoring Structural, Chemical, and Photocatalytic Properties of ZnO@β-SiC Composites: The Effect of Annealing Temperature and Environment

et al. 2023

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“…The UVinduced superhydrophilic property of ZnO and WO 3 allows water droplets to spread and ow on the surface of the cover glass, contributing to the self-cleaning process. Combining the self-cleaning process and the photocatalytic activity within a coating is of great importance in terms of the solar energy technology [23].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, SiO 2 with a low refractive index and low surface scattering is bene cial and effective in improving the light transmission for the glass cover of the PV panel. In addition, SiO 2 lm exhibits hydrophilicity and selfcleaning properties owing to the presence of hydroxyl groups in its chemical structure [23]. However, the superhydrophilicity of a SiO 2 lm coated on the cover glass of the PV panel may reduce in time owing to deposition of dust and organic pollutants, and the photocatalytic activity of SiO 2 is low [24].…”

Section: Introductionmentioning

confidence: 99%

SiO2 /WO3 /ZnO Based Self-cleaning Coatings for Solar Cells

Koysuren,

Dhoska,

Koysuren

et al. 2023

Preprint

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The accumulation of pollution and any kinds of contamination on the glass cover of the solar cell affects the efficiency of the photovoltaic (PV) systems. The contamination on the glass cover can absorb and reflect a certain part of the sunlight irradiation, which can decrease the intensity of the light coming in through the glass cover. With the study, it was planned to develop self-cleaning coatings for the PV systems. It was aimed to prevent or reduce the contamination-induced efficiency loss of the existing PV systems. In the scope of the project, SiO2/WO3 and SiO2/WO3/ZnO composites were coated from their solutions on the glass substrates using a dip-coating technique. WO3 was selected as a photocatalyst semiconductor. Under the UV light irradiation, WO3 could absorb the photons of the UV light, generating the photoinduced charge carriers. The photoexcited charge carriers provide both the photoinduced hydrophilicity on the surface of the coating and the photocatalytic degradation of the organic contaminants accumulated on the surface of the coating, which allows water droplets to spread and flow on the surface of the cover glass to remove the contaminations. However, the recombination rate of the photoexcited charge carriers on the WO3 film was high. In order to suppress the recombination of the photoinduced charge carriers, WO3 was coupled with SiO2 and ZnO. Both of these semiconductors improved the photocatalytic activity of the WO3 film. Although SiO2 has superior features in terms of the light transmission, it was not very effective under UV light as a photocatalyst alone. The widely preferred photocatalyst ZnO was added into the composite film structure to enhance the photocatalytic activity. The self-cleaning mechanism of the film coatings on a solar cell was investigated through the photocatalytic dye removal efficiency on the as-prepared film samples. There was a slight decrease in the light transparency and the solar cell efficiency because of the WO3 content of the composite film. On the other hand, coupling the SiO2/WO3 film with ZnO enhanced the photocatalytic activity, and it suppressed the reduction effect of the WO3 phase on both the light transparency and the solar cell efficiency. The photocatalytic dye removal efficiency was increased to over 90% after 240 min of UVA light irradiation. In addition, the solar cell coated with the SiO2/WO3/ZnO film provided almost the same solar cell efficiency as the uncoated solar cell. The water contact angle measurement also exhibited the photocatalytic degradation of the model contamination on the glass cover of the solar cell under the UVA light irradiation.

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Investigation of photocatalytic performance of single layer superhydrophilic film: TEOS/PF‐127

Ramakrishnan,

Jayaraj,

Ragupathy

2023

Environmental Quality Mgmt

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Multifunctional antireflective coatings (ARC) have great importance in various applications such as optical devices, flat panel displays, solar cell devices, and so on. Here in this work, highly transparent superhydrophilic film was developed on a cleaned glass substrate by depositing porous TEOS/PF‐127 using the spin coating technique. The coating shows a maximum transparency of 95% in the visible region (400–800 nm). The morphology and porous nature of the prepared sample was analyzed using FESEM and BET analysis respectively. The prepared film exhibited a water contact angle of 9° ensures its superhydrophilic nature. It is also noteworthy that TEOS/PF‐127 coating possesses photocatalytic activity by showing good photo degradation against MB (Methylene Blue) dye under UV‐B (280–315 nm, 50 W) and halogen (340–850 nm, 50 W) light irradiation. The present work provides a simple cost‐effective method to enhance the optical transparency of the glass substrate along with good self‐cleaning properties via photocatalytic activity.

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Sol–gel synthesis of ZnO–SiO2 thin films: impact of ZnO contents on its photonic efficiency

Cited by 15 publications

References 50 publications

Tailoring Structural, Chemical, and Photocatalytic Properties of ZnO@β-SiC Composites: The Effect of Annealing Temperature and Environment

Tailoring Structural, Chemical, and Photocatalytic Properties of ZnO@β-SiC Composites: The Effect of Annealing Temperature and Environment

SiO2 /WO3 /ZnO Based Self-cleaning Coatings for Solar Cells

Investigation of photocatalytic performance of single layer superhydrophilic film: TEOS/PF‐127

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