Characteristics of pure and Fe doped polycrystalline CeO2 using terahertz spectroscopy

Qi-Ye Wen; Huai-Wu Zhang; Qing-Hui Yang; Sheng Li; Jie Zha; De-Gang Xu; Jian-Quan Yao

doi:10.1117/12.820520

16 February 2009 Characteristics of pure and Fe doped polycrystalline CeO₂ using terahertz spectroscopy

Qi-Ye Wen, Huai-Wu Zhang, Qing-Hui Yang, Sheng Li, Jie Zha, De-Gang Xu, Jian-Quan Yao

Proceedings Volume 7277, Photonics and Optoelectronics Meetings (POEM) 2008: Terahertz Science and Technology; 72770C (2009) https://doi.org/10.1117/12.820520
Event: Photonics and Optoelectronics Meetings, 2008, Wuhan, China

Abstract

Ferromagnetic high-k dielectrics are very promising candidates to replace SiO₂ in silicon based microelectronics industry, and also could simultaneously enable semiconductor spintronic devices that harness polarized electrons. In present work, Fe doped CeO₂ was synthesized by ceramic method and the effects of Fe doping on the structure and properties were characterized by ordinary methods and terahertz-time domain spectrometer (THz-TDS) technique. Our results show that the pure CeO₂ only has a small dielectric constant (ε) of 4, while a small amount of Fe (0.9%) doping into CeO₂ promotes the densification and induces a large ε of 23. From the THz spectroscopy, it is found that for undoped CeO₂ both the power absorption and the index of refraction increase with frequency, while for Fe doped CeO₂ we measure a remarkable transparency together with a flat index curve. The absorption coefficient of Fe doped CeO₂ was less than 0.35 cm^-1 ranging from 0.2 to 1.8 THz, rendering it a potential THz optical material. Our results also illustrate that THz technique is a powerful tool to differentiate the dielectric related electronic characteristics of high k materials.

Citation Download Citation

Qi-Ye Wen, Huai-Wu Zhang, Qing-Hui Yang, Sheng Li, Jie Zha, De-Gang Xu, and Jian-Quan Yao "Characteristics of pure and Fe doped polycrystalline CeO₂ using terahertz spectroscopy", Proc. SPIE 7277, Photonics and Optoelectronics Meetings (POEM) 2008: Terahertz Science and Technology, 72770C (16 February 2009); https://doi.org/10.1117/12.820520

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