Improved characteristics of near-band-edge and deep-level emissions from Zno nanorod arrays by atomic-layer-deposited Al2O3 and zno shell layers

Wen Cheng Sun; Yu Cheng Yeh; Chung Ting Ko; Jr Hau He; Miin Jang Chen

doi:10.1186/1556-276X-6-556

Improved characteristics of near-band-edge and deep-level emissions from Zno nanorod arrays by atomic-layer-deposited Al₂O₃ and zno shell layers

Wen Cheng Sun, Yu Cheng Yeh, Chung Ting Ko, Jr Hau He, Miin Jang Chen^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

45 Scopus citations

Abstract

We report on the characteristics of near-band-edge (NBE) emission and deep-level band from ZnO/Al₂O₃ and ZnO/ZnO core-shell nanorod arrays (NRAs). Vertically aligned ZnO NRAs were synthesized by an aqueous chemical method, and the Al₂O₃ and ZnO shell layers were prepared by the highly conformal atomic layer deposition technique. Photoluminescence measurements revealed that the deep-level band was suppressed and the NBE emission was significantly enhanced after the deposition of Al₂O₃ and ZnO shells, which are attributed to the decrease in oxygen interstitials at the surface and the reduction in surface band bending of ZnO core, respectively. The shift of deep-level emissions from the ZnO/ZnO core-shell NRAs was observed for the first time. Owing to the presence of the ZnO shell layer, the yellow band associated with the oxygen interstitials inside the ZnO core would be prevailed over by the green luminescence, which originates from the recombination of the electrons in the conduction band with the holes trapped by the oxygen vacancies in the ZnO shell.

Original language	English (US)
Article number	556
Journal	Nanoscale Research Letters
Volume	6
DOIs	https://doi.org/10.1186/1556-276X-6-556
State	Published - 2011
Externally published	Yes

Bibliographical note

Funding Information:
This work was financially supported by the National Science Council in Taiwan under contract number NSC98-2112-M-002-018-MY2 and NSC100-3113-E002-011.

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics

Access to Document

10.1186/1556-276X-6-556

Cite this

@article{e216d0d91907485db8c95e812d6c118b,

title = "Improved characteristics of near-band-edge and deep-level emissions from Zno nanorod arrays by atomic-layer-deposited Al2O3 and zno shell layers",

abstract = "We report on the characteristics of near-band-edge (NBE) emission and deep-level band from ZnO/Al2O3 and ZnO/ZnO core-shell nanorod arrays (NRAs). Vertically aligned ZnO NRAs were synthesized by an aqueous chemical method, and the Al2O3 and ZnO shell layers were prepared by the highly conformal atomic layer deposition technique. Photoluminescence measurements revealed that the deep-level band was suppressed and the NBE emission was significantly enhanced after the deposition of Al2O3 and ZnO shells, which are attributed to the decrease in oxygen interstitials at the surface and the reduction in surface band bending of ZnO core, respectively. The shift of deep-level emissions from the ZnO/ZnO core-shell NRAs was observed for the first time. Owing to the presence of the ZnO shell layer, the yellow band associated with the oxygen interstitials inside the ZnO core would be prevailed over by the green luminescence, which originates from the recombination of the electrons in the conduction band with the holes trapped by the oxygen vacancies in the ZnO shell.",

author = "Sun, {Wen Cheng} and Yeh, {Yu Cheng} and Ko, {Chung Ting} and He, {Jr Hau} and Chen, {Miin Jang}",

note = "Funding Information: This work was financially supported by the National Science Council in Taiwan under contract number NSC98-2112-M-002-018-MY2 and NSC100-3113-E002-011.",

year = "2011",

doi = "10.1186/1556-276X-6-556",

language = "English (US)",

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journal = "Nanoscale Research Letters",

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T1 - Improved characteristics of near-band-edge and deep-level emissions from Zno nanorod arrays by atomic-layer-deposited Al2O3 and zno shell layers

AU - Sun, Wen Cheng

AU - Yeh, Yu Cheng

AU - Ko, Chung Ting

AU - He, Jr Hau

AU - Chen, Miin Jang

N1 - Funding Information: This work was financially supported by the National Science Council in Taiwan under contract number NSC98-2112-M-002-018-MY2 and NSC100-3113-E002-011.

PY - 2011

Y1 - 2011

N2 - We report on the characteristics of near-band-edge (NBE) emission and deep-level band from ZnO/Al2O3 and ZnO/ZnO core-shell nanorod arrays (NRAs). Vertically aligned ZnO NRAs were synthesized by an aqueous chemical method, and the Al2O3 and ZnO shell layers were prepared by the highly conformal atomic layer deposition technique. Photoluminescence measurements revealed that the deep-level band was suppressed and the NBE emission was significantly enhanced after the deposition of Al2O3 and ZnO shells, which are attributed to the decrease in oxygen interstitials at the surface and the reduction in surface band bending of ZnO core, respectively. The shift of deep-level emissions from the ZnO/ZnO core-shell NRAs was observed for the first time. Owing to the presence of the ZnO shell layer, the yellow band associated with the oxygen interstitials inside the ZnO core would be prevailed over by the green luminescence, which originates from the recombination of the electrons in the conduction band with the holes trapped by the oxygen vacancies in the ZnO shell.

AB - We report on the characteristics of near-band-edge (NBE) emission and deep-level band from ZnO/Al2O3 and ZnO/ZnO core-shell nanorod arrays (NRAs). Vertically aligned ZnO NRAs were synthesized by an aqueous chemical method, and the Al2O3 and ZnO shell layers were prepared by the highly conformal atomic layer deposition technique. Photoluminescence measurements revealed that the deep-level band was suppressed and the NBE emission was significantly enhanced after the deposition of Al2O3 and ZnO shells, which are attributed to the decrease in oxygen interstitials at the surface and the reduction in surface band bending of ZnO core, respectively. The shift of deep-level emissions from the ZnO/ZnO core-shell NRAs was observed for the first time. Owing to the presence of the ZnO shell layer, the yellow band associated with the oxygen interstitials inside the ZnO core would be prevailed over by the green luminescence, which originates from the recombination of the electrons in the conduction band with the holes trapped by the oxygen vacancies in the ZnO shell.

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