Nanostructural analysis of ZnO:Al thin films for carrier-transport mechanisms

Lee, Seungyoon; Lee, Woojin; Nahm, Changwoo; Kim, Jongmin; Byun, Sujin; Hwang, Taehyun; Lee, Byung-Kee; Jang, Young Il; Lee, Sungeun; Lee, Heon-Min; Park, Byungwoo

doi:10.1016/j.cap.2012.12.003

Cited by 14 publications

(5 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Cross-sectional TEM observation [ Figs. 3(a) and 4(a)] clearly show the same morphology for both films: columnar grains grow on a thin seed layer constituted by smaller grains, similarly as observed earlier by other groups 13,21) for AZO films grown on glass. According to energy-dispersive X-ray spectroscopy (EDS) analysis, the smaller grains are constituted by Al, Zn, and O.…”

Section: )supporting

confidence: 81%

Enhanced thermoelectric performance of Al-doped ZnO thin films on amorphous substrate

Saini¹,

Mele²,

Honda³

et al. 2014

Jpn. J. Appl. Phys.

View full text Add to dashboard Cite

2% Al-doped ZnO (AZO) thin films fabricated at 300°C by pulsed laser deposition (PLD) on amorphous fused silica demonstrated the high quality crystallinity and grain connection, which correlates to the high thermoelectric performance: electrical conductivity σ = 923 S/cm and Seebeck coefficient S = %111 µV/K at 600 K. Its power factor (S 2 & σ) is 1.2 ' 10 %3 W m %1 K %2 , twofold better than films deposited on crystalline SrTiO 3 under the same experimental conditions. Using our measured thermal conductivity (κ) at 300 K (4.89 W m %1 K %1), the figure of merit, ZT = (S 2 & σ & T/κ), is calculated as 0.045 at 600 K, 5 times larger than ZT of our previously reported bulk ZnO.

show abstract

Section: )supporting

confidence: 81%

Enhanced thermoelectric performance of Al-doped ZnO thin films on amorphous substrate

Saini¹,

Mele²,

Honda³

et al. 2014

Jpn. J. Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…This fact indicates that the Co precursor added to the solutions seldom affected the crystal structure of the ZnO nanowires. All samples showed and E. The degree of angular misorientation among the nanowires can be characterized by the (002) rocking curve [26]. Therefore, this result demonstrated that the misorientation of the (002) crystal plane of the ZnO nanowires increased as the concentration of Co precursor increased.…”

Section: Resultsmentioning

confidence: 75%

Morphological and Optical Properties of Cobalt Ion-Modified ZnO Nanowires

Choi¹,

Lee

Sohn

2020

Catalysts

View full text Add to dashboard Cite

In this study, we prepared cobalt (Co) ion-modified ZnO nanowires using hydrothermal synthesis with zinc acetate dehydrate and Co (II) acetate hydrate precursors in ethanol solutions. Their morphological and optical properties were investigated with varying Co precursor concentration. The morphological changes of the ZnO nanowires depended positively on the concentration of the Co precursor. The ZnO nanowires showed modified crystal orientations and nanostructure shapes depending on the Co concentration in the solutions. Variations in the optical properties of the Co ion-modified ZnO nanowires could be explained by the interaction of the Co ions with the band electrons, oxygen vacancies, and zinc interstitials. The overall growth and characteristics of ZnO nanowires synthesized in solutions containing low levels of Co ions were related to Co doping into the ZnO bulks. In solutions containing high levels of Co ions, these were additionally related to the Co oxide cluster.

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

Nanostructural analysis of ZnO:Al thin films for carrier-transport mechanisms

Cited by 14 publications

References 16 publications

Enhanced thermoelectric performance of Al-doped ZnO thin films on amorphous substrate

Enhanced thermoelectric performance of Al-doped ZnO thin films on amorphous substrate

Morphological and Optical Properties of Cobalt Ion-Modified ZnO Nanowires

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

Contact Info

Product

Resources

About