A-Site-Modified Perovskite Nanosheets and Their Integration into High-kappa Dielectric Thin Films with a Clean Interface

作者：Li Bao Wen^*; Osada Minoru; Ozawa Tadashi C; Akatsuka Kosho; Ebina Yasuo; Ma Renzi; Ono Kanta; Funakubo Hiroshi; Sasaki Takayoshi

来源：Japanese Journal of Applied Physics, 2010, 49(9): 09MA01.

DOI：10.1143/JJAP.49.09MA01

We investigated dielectric properties of La1-xEuxNb2O7 perovskite nanosheets in order to study the effect of A-site modification on dielectric properties. Langmuir-Blodgett deposition was employed to fabricate multilayer nanofilms of perovskite nanosheets. In these nanosheets, A-site modification with Eu3+ ions improves the leakage current characteristics and, at the same time, reduces permittivity. The slight modification with Eu3+ ions in La0.95Nb2O7 nanosheets causes a 50% reduction in epsilon(r) value. We also discuss the high-kappa properties of La0.95Nb2O7 nanosheets by performing detailed investigations based on first-principles calculations and interfacial structures.

• 出版日期2010