Enhanced near-field noise absorption of transparent ZnO nanofilms by Al substitution
| Autor: | Jenn-Ming Wu, Yu-Ting Huang, Min-Da Yang, Tung Mean-Jue, Shi-Yuan Tong |
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| Rok vydání: | 2010 |
| Předmět: |
Materials science
Acoustics and Ultrasonics business.industry Attenuation Doping Near and far field Dielectric Sputter deposition Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials Crystal Optics Optoelectronics business Absorption (electromagnetic radiation) Noise (radio) |
| Zdroj: | Journal of Physics D: Applied Physics. 43:445502 |
| ISSN: | 1361-6463 0022-3727 |
| Popis: | Transparent Al-doped ZnO (AZO) conductive films were prepared by confocal dc-reactive magnetron sputtering using Zn and Al targets in an Ar/O2 reactive atmosphere. The effect of Al substitution on the near-field radio-frequency (RF) noise absorption of the AZO films was investigated. After a standard short–open–load–through calibration, the near-field RF noise attenuation was measured using a RF microstrip test fixture suitable for quasi-transverse electromagnetic wave propagation. The RF noise absorption capability of the AZO films is enhanced from essentially zero to 26% (4–6 GHz) by doping with 5.9% Al. Surface proximity-induced loss is considered the dominating mechanism in the RF noise absorption of AZO films. The crystal quality and morphology are affected significantly by the substitution of Al in AZO films. Dc conductivities, dielectric properties and optical characterizations are also discussed. |
| Databáze: | OpenAIRE |
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