| 학회 |
한국재료학회 |
| 학술대회 |
2007년 가을 (11/02 ~ 11/02, 성균관대학교) |
| 권호 |
13권 2호 |
| 발표분야 |
전자재료 |
| 제목 |
Adsorbate Perspective of the Field Emission Behaviour of ZnO Nanoneedle Arrays |
| 초록 |
ZnO nanoneedle arrays were formed on ZnO:Al/Pt/Si (001) conductive substrate by catalyst-free MOCVD and prototype test cells based on transparent conductive electrodes were prepared for the investigation of the field emission (FE) characteristics of ZnO 1-D nanostructures. It was possible to obtain well-aligned vertical array of high quality ZnO nanoneedles on a Si (001) substrate by depositing an Al-doped ZnO buffer layer on it to provide a seamless interface as well as an electric conduction path to the nanoneedle field emitters. Measurements of the FE characteristics on the as-fabricated and the UV-treated ZnO nanoneedles showed that FE behaviour of the nanoneedles is dependent on the UV-treatment. Such observations are attributed to the changes in the surface states due to adsorption and desorption of the oxygen related adsorbates on the surface of the ZnO nanoneedles. It is suggested that modifications in the tunnelling barrier height or apparent work function and the effective aspect ratio due to the presence of surface adsorbate are responsible for the changes in the measured FE characteristics. Desorption of the surface species driven by the combination of negatively charged adsorbed oxygen species on the nanoneedle surface with holes created by the UV irradiation seemed to have resulted in the stabilised FE behaviour of the ZnO nanoneedles. |
| 저자 |
왕린1, 최희규1, 정민창2, 명재민3, 이웅1
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| 소속 |
1창원대, 2LG Philips LCD, 3연세대 |
| 키워드 |
ZnO nanoneedle; field emission; adsorbate
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| E-Mail |
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