Aluminum-doped zinc oxide sol–gel thin films: Influence of the sol's water content on the resistivity

Nehmann, Julia B.; Ehrmann, Nicole; Reineke‐Koch, Rolf; Bahnemann, Detlef W.

doi:10.1016/j.tsf.2014.01.052

Cited by 11 publications

(9 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, a recently proposed modification to improve the films’ conductivity value is studied more profoundly here. Accordingly [22], by adding water to the coating sol, the subsequent change in the hydrolysis reaction leads to a decrease in the resistivity of the final AZO thin film. This study attempts to clarify the reasons for such an observation, and the results contribute to the sol–gel deposition of AZO thin films with higher FoM values, and therefore, superior optoelectrical performance.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Sol–Gel Route to Obtain a Highly Transparent and Conductive Aluminum-Doped Zinc Oxide Thin Film

Nateq

Ceccato

2019

Materials

View full text Add to dashboard Cite

The electrical and optical properties of sol–gel derived aluminum-doped zinc oxide thin films containing 2 at.% Al were investigated considering the modifying effects of (1) increasing the sol H2O content and (2) a thermal treatment procedure with a high-temperature approach followed by an additional heat-treatment step under a reducing atmosphere. According to the results obtained via the TG-DTA analysis, FT-IR spectroscopy, X-ray diffraction technique, and four-point probe resistivity measurements, it is argued that in the modified sample, the sol hydrolysis, decomposition of the deposited gel, and crystallization of grains result in grains of larger crystallite size in the range of 20 to 30 nm and a stronger c-axis preferred orientation with slightly less microstrain. The obtained morphology and grain-boundary characteristics result in improved conductivity considering the resistivity value below 6 mΩ·cm. A detailed investigation of the samples’ optical properties, in terms of analyzing their absorption and dispersion behaviors through UV-Vis-NIR spectroscopy, support our reasoning for the increase of the mobility, and to a lesser extent the concentration of charge carriers, while causing only a slight degradation of optical transmittance down to nearly 80%. Hence, an enhanced performance as a transparent conducting film is claimed for the modified sample by comparing the figure-of-merit values.

show abstract

Section: Introductionmentioning

confidence: 99%

Enhanced Sol–Gel Route to Obtain a Highly Transparent and Conductive Aluminum-Doped Zinc Oxide Thin Film

Nateq

Ceccato

2019

Materials

View full text Add to dashboard Cite

show abstract

“…In reality, ZnO films synthesized by using a Zn(CH 3 COO) 2 ·2H 2 O precursor (as in this study) can contain some Zn(OH) 2 , which can be acceptable when considering the synthesis-associated chemical chain reactions [38,69,73,74,75,76,77]:Zn(CH 3 COO) 2 ∙2H 2 O → Zn(CH 3 COO) 2 + 2H 2 O Zn(CH 3 COO) 2 + 2H 2 O → 2CH 3 COOH + Zn(OH) 2 Zn(OH) 2 + 4NH 2 CH 2 CH 2 OH → [Zn(NH 2 CH 2 CH 2 OH) 4 ] 2+ + 2OH – Zn(OH) 2 + 2OH – → [Zn(OH) 4 ] 2– Zn(OH) 2 → ZnO + H 2 O…”

Section: Resultsmentioning

confidence: 99%

Effect of Ultraviolet–Ozone Treatment on the Properties and Antibacterial Activity of Zinc Oxide Sol-Gel Film

Kim

Lee

et al. 2019

Materials

View full text Add to dashboard Cite

To combat infectious diseases, zinc oxide (ZnO) has been identified as an effective antibacterial agent; however, its performance can be adversely affected by harsh application environments. The ozone impact on ZnO antibacterial film needs to be evaluated prior to its application in an ozone disinfection system. In this study, ZnO films synthesized via sol-gel/spin-coating were subjected to ultraviolet–ozone (UVO) treatment for different periods. Surface investigations using scanning electron microscopy, ultraviolet–visible spectroscopy, and X-ray photoelectron spectroscopy revealed that the treatment-induced film changes. With longer UVO treatment, the surface porosity of the film gradually increased from 5% to 30%, causing the transmittance reduction and absorbance increase in visible-light range. Phase transformation of Zn(OH)2 to ZnO occurred during the first 10 min of UVO treatment, followed by oxygen uptake as a consequence of the reaction with reactive oxygen species generated during UVO treatment. However, despite these surface changes, the satisfactory antibacterial activity of the synthesized ZnO film against Staphylococcus aureus and Escherichia coli was sustained even after 120 min of UVO treatment. This indicates that the UVO-induced surface changes do not have a significant effect on the antibacterial performance and that the ZnO sol-gel film possesses good functional durability in ozone environments.

show abstract

“…However, as the present study uses the hot plate as the heating source, its effect cannot be completely eliminated. The lack of hydroxyl group could be a possible explanation for the wrinkle formation as no water was added into the during the precursor preparation, which has been found to be strongly influence the surface of sol-gel deposited ZnO [24]. The optical transmittance spectra of the ZnO, NZO and NAZO thin films in the visible range are presented in Fig.…”

Section: Resultsmentioning

confidence: 99%

Enhanced photocatalytic activity of sol–gel derived ZnO via the co-doping process

2015

Superlattices and Microstructures

View full text Add to dashboard Cite

Aluminum-doped zinc oxide sol–gel thin films: Influence of the sol's water content on the resistivity

Cited by 11 publications

References 25 publications

Enhanced Sol–Gel Route to Obtain a Highly Transparent and Conductive Aluminum-Doped Zinc Oxide Thin Film

Enhanced Sol–Gel Route to Obtain a Highly Transparent and Conductive Aluminum-Doped Zinc Oxide Thin Film

Effect of Ultraviolet–Ozone Treatment on the Properties and Antibacterial Activity of Zinc Oxide Sol-Gel Film

Enhanced photocatalytic activity of sol–gel derived ZnO via the co-doping process

Contact Info

Product

Resources

About