Improved characteristics of near-band-edge and deep-level emissions from ZnO nanorod arrays by atomic-layer-deposited Al<sub>2</sub>O<sub>3 </sub>and ZnO shell layers
<p>Abstract</p> <p>We report on the characteristics of near-band-edge (NBE) emission and deep-level band from ZnO/Al<sub>2</sub>O<sub>3 </sub>and ZnO/ZnO core-shell nanorod arrays (NRAs). Vertically aligned ZnO NRAs were synthesized by an aqueous chemical me...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2011-01-01
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| Series: | Nanoscale Research Letters |
| Online Access: | http://www.nanoscalereslett.com/content/6/1/556 |
| _version_ | 1797716892840886272 |
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| author | He Jr-Hau Sun Wen-Cheng Yeh Yu-Cheng Ko Chung-Ting Chen Miin-Jang |
| author_facet | He Jr-Hau Sun Wen-Cheng Yeh Yu-Cheng Ko Chung-Ting Chen Miin-Jang |
| author_sort | He Jr-Hau |
| collection | DOAJ |
| description | <p>Abstract</p> <p>We report on the characteristics of near-band-edge (NBE) emission and deep-level band from ZnO/Al<sub>2</sub>O<sub>3 </sub>and ZnO/ZnO core-shell nanorod arrays (NRAs). Vertically aligned ZnO NRAs were synthesized by an aqueous chemical method, and the Al<sub>2</sub>O<sub>3 </sub>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 Al<sub>2</sub>O<sub>3 </sub>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.</p> <p>PACS 68.65.Ac; 71.35.-y; 78.45.+h; 78.55.-m; 78.55.Et; 78.67.Hc; 81.16.Be; 85.60.Jb.</p> |
| first_indexed | 2024-03-12T08:29:12Z |
| format | Article |
| id | doaj.art-d147c458b0294dab813b3be08140d02a |
| institution | Directory Open Access Journal |
| issn | 1931-7573 1556-276X |
| language | English |
| last_indexed | 2024-03-12T08:29:12Z |
| publishDate | 2011-01-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Nanoscale Research Letters |
| spelling | doaj.art-d147c458b0294dab813b3be08140d02a2023-09-02T17:57:25ZengSpringerOpenNanoscale Research Letters1931-75731556-276X2011-01-0161556Improved characteristics of near-band-edge and deep-level emissions from ZnO nanorod arrays by atomic-layer-deposited Al<sub>2</sub>O<sub>3 </sub>and ZnO shell layersHe Jr-HauSun Wen-ChengYeh Yu-ChengKo Chung-TingChen Miin-Jang<p>Abstract</p> <p>We report on the characteristics of near-band-edge (NBE) emission and deep-level band from ZnO/Al<sub>2</sub>O<sub>3 </sub>and ZnO/ZnO core-shell nanorod arrays (NRAs). Vertically aligned ZnO NRAs were synthesized by an aqueous chemical method, and the Al<sub>2</sub>O<sub>3 </sub>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 Al<sub>2</sub>O<sub>3 </sub>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.</p> <p>PACS 68.65.Ac; 71.35.-y; 78.45.+h; 78.55.-m; 78.55.Et; 78.67.Hc; 81.16.Be; 85.60.Jb.</p>http://www.nanoscalereslett.com/content/6/1/556 |
| spellingShingle | He Jr-Hau Sun Wen-Cheng Yeh Yu-Cheng Ko Chung-Ting Chen Miin-Jang Improved characteristics of near-band-edge and deep-level emissions from ZnO nanorod arrays by atomic-layer-deposited Al<sub>2</sub>O<sub>3 </sub>and ZnO shell layers Nanoscale Research Letters |
| title | Improved characteristics of near-band-edge and deep-level emissions from ZnO nanorod arrays by atomic-layer-deposited Al<sub>2</sub>O<sub>3 </sub>and ZnO shell layers |
| title_full | Improved characteristics of near-band-edge and deep-level emissions from ZnO nanorod arrays by atomic-layer-deposited Al<sub>2</sub>O<sub>3 </sub>and ZnO shell layers |
| title_fullStr | Improved characteristics of near-band-edge and deep-level emissions from ZnO nanorod arrays by atomic-layer-deposited Al<sub>2</sub>O<sub>3 </sub>and ZnO shell layers |
| title_full_unstemmed | Improved characteristics of near-band-edge and deep-level emissions from ZnO nanorod arrays by atomic-layer-deposited Al<sub>2</sub>O<sub>3 </sub>and ZnO shell layers |
| title_short | Improved characteristics of near-band-edge and deep-level emissions from ZnO nanorod arrays by atomic-layer-deposited Al<sub>2</sub>O<sub>3 </sub>and ZnO shell layers |
| title_sort | improved characteristics of near band edge and deep level emissions from zno nanorod arrays by atomic layer deposited al sub 2 sub o sub 3 sub and zno shell layers |
| url | http://www.nanoscalereslett.com/content/6/1/556 |
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