Study of the effect of stress/strain of mesoporous Al-doped ZnO thin films on thermoelectric properties

Hong, Min Hee; Choi, Hee Young; Shim, Dong Il; Cho, Hyung Hee; Kim, Jiwan; Park, Hyung Ho

doi:10.1016/j.solidstatesciences.2018.05.010

Cited by 25 publications

(10 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This phenomenon is attributable to the partial lattice distortion caused by the ionic size difference between Al 3 + and Zn 2 + . The same trend was observed and reported by Hong et al [48]…”

Section: Xrd Analysissupporting

confidence: 91%

Thermoelectric, Electronic, and Optical Response of Nanostructured Al‐doped ZnO @ 2D‐TiC Composite

et al. 2020

View full text Add to dashboard Cite

ZnO is one of the sought-out materials for thermoelectricity. This study investigates the effect of aluminum doping, and titanium carbide (TiC) modification on the thermoelectric properties of ZnO through the synthesis of undoped ZnO, Aldoped ZnO (Al-ZnO), and TiC modified Al-doped ZnO (TiC@Al-ZnO) nanocomposite by the hydrothermal method and mechanical alloying. XRD, TEM, and SEM were used for structural and morphological studies. The electrical and thermal conductivity measurements on the nanocomposite were obtain using Van der pauw 4 probe collinear method. A decrease in thermal conductivity of ZnO from 7.62 to 5.75 W/cm K is observed after been modified with Al and TiC. TiC@Al-ZnO nanocomposite exhibits the lowest thermal conductivity and highest power factor than Al-doped ZnO. Furthermore, the impact of TiC and Al revealed an enormous effect on the Seebeck coefficient of ZnO reaching 105 μV K À 1 AT 960 K, and a figure of merit value of 0.28 at 960 K. The increase in negative Seebeck coefficients suggests that the amount of active charge carrier, with significant energy, was temperature and structure depend. The experimental data obtained in this work showed the effect of both Al concentration and TiC nanosheet reinforcement on the thermoelectric properties of ZnO.

show abstract

Section: Xrd Analysissupporting

confidence: 91%

Thermoelectric, Electronic, and Optical Response of Nanostructured Al‐doped ZnO @ 2D‐TiC Composite

et al. 2020

View full text Add to dashboard Cite

show abstract

“…These results show that the 500-fold enhancement of the conductivity after Ag deposition originates from the two orders of magnitude enhancement of the carrier concentration as well as from a significant improvement of mobility. It has been reported that several factors contribute to the PF performance of ZnO film, such as the doping efficiency on Zn sites [8], crystallinity [25,26], stress and strain [27], the grain-boundary [28,29] and areal concentration of dislocation [10]. The enhancement of the PF performance in the present Ag-deposited ZnO films can be mainly ascribed to the Ag NPs on the ZnO films which lead to a remarkable increase of the carrier concentration and thus to a great improvement of conductivity.…”

Section: Resultsmentioning

confidence: 99%

Enhancing the thermoelectric performance of ZnO film by sputter-deposition of Ag nanoparticles

Sun

Wang

Sun

et al. 2020

Mater. Res. Express

View full text Add to dashboard Cite

Owing to the surface plasmon resonance (SPR), noble metal nanoparticles (NPs) have been intensively employed to improve the optical properties of semiconductors. In this work, Ag NPs are deposited on fully c-axis oriented ZnO film with high-crystallinity prepared by radiofrequency magnetron sputtering on glass substrates. After Ag sputtering of 15 s, the ultraviolet light emission intensity of ZnO film significantly is increased by 50% due to the SPR of Ag NPs. Moreover, the conductive behavior changes from n-type semiconductor to metal-like with room-temperature conductivity sharply increasing by nearly three orders of magnitude from 4.8 for pure ZnO film to 3400 S cm −1 for Ag-deposited ZnO film. The change of conductive behavior and the remarkable increase of the conductivity can be ascribed to isolated Ag NPs with high-density electrons which are distributed on the ZnO film, leading to an increase of carrier concentration that exceeds Mott's critical density (>10 19 cm −3 ). Hall measurements show that after Ag sputtering of 15 s, the mobility increases from about 8 to 40 cm 2 V −1 s −1 and that the carrier concentration increases from 4×10 18 to 5×10 20 cm −3 . Owing to the remarkable improvement of the conductivity, the power-factor value at room temperature is enhanced from 11.5 to 49.2 μWm −1 K −2 .

show abstract

“…The Seebeck coefficient is defined as the ratio of the voltage difference to the temperature difference between two sides of the materials ( S = Δ V /Δ T ). The temperature range could be set by using a software system [19]. In this paper, the temperature difference was from 323 to 478 K at intervals of 50 K under a helium gas flow atmosphere.…”

Section: Methodsmentioning

confidence: 99%

The thermoelectric properties of Au nanoparticle-incorporated Al-doped mesoporous ZnO thin films

et al. 2019

Self Cite

View full text Add to dashboard Cite

Mesoporous Al-doped ZnO thin films incorporated with gold nanoparticles (Au NPs) were synthesized using a sol–gel and evaporation-induced self-assembly process. In this study, the complementary effects of Au NP incorporation and Al doping on the thermoelectric properties of mesoporous ZnO thin films were analysed. The incorporated Au NPs induced an increase in electrical conductivity but a detriment in the pore arrangement of the mesoporous ZnO thin film, which was accompanied by a decrease in porosity. However, the addition of the Al dopant minimized the pore structural collapse because of the inhibition of the grain growth in the ZnO skeletal structure, resulting in the enhancement of the pore arrangement and porosity. When the Au NPs and Al dopant were added at the same time, the degradation in the pore structure was minimized and the electrical conductivity was effectively increased, but the absolute value of the Seebeck coefficient was decreased. However, as a result, the thermoelectric power factor was increased by 2.4 times compared to that of the pristine mesoporous ZnO thin film. It was found that co-introducing the Au NPs and Al doping to the mesoporous ZnO structure was effective in preserving the pore structure and increasing the electric conductivity, thereby enhancing the thermoelectric property of the mesoporous ZnO thin film.

show abstract

Study of the effect of stress/strain of mesoporous Al-doped ZnO thin films on thermoelectric properties

Cited by 25 publications

References 47 publications

Thermoelectric, Electronic, and Optical Response of Nanostructured Al‐doped ZnO @ 2D‐TiC Composite

Thermoelectric, Electronic, and Optical Response of Nanostructured Al‐doped ZnO @ 2D‐TiC Composite

Enhancing the thermoelectric performance of ZnO film by sputter-deposition of Ag nanoparticles

The thermoelectric properties of Au nanoparticle-incorporated Al-doped mesoporous ZnO thin films

Contact Info

Product

Resources

About