抄録
An approach to control the dielectric properties of hafnium-based oxide films with an intentional structural phase transformation was proposed and demonstrated. Yttrium serves effectively as a dopant to induce a phase transformation from the monoclinic to the cubic phase even at 600 °C. The yttrium-doped Hf O2 films show higher permittivity than undoped Hf O2, and the permittivity as high as 27 is obtained by 4 at. % yttrium doping. The permittivity enhancement by yttrium doping can be explained by the shrinkage of molar volume due to the structural phase transformation. The advantage of yttrium doping is more pronounced at higher temperatures, since the permittivity of undoped Hf O2 is reduced significantly, whereas that of 17 at. % yttrium-doped film shows no change even at 1000 °C.
本文言語 | English |
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論文番号 | 102906 |
ページ(範囲) | 1-3 |
ページ数 | 3 |
ジャーナル | Applied Physics Letters |
巻 | 86 |
号 | 10 |
DOI | |
出版ステータス | Published - 2005 3月 7 |
外部発表 | はい |
ASJC Scopus subject areas
- 物理学および天文学(その他)