| 학회 | 한국재료학회 |
| 학술대회 | 2011년 봄 (05/26 ~ 05/27, 제주 휘닉스 아일랜드) |
| 권호 | 17권 1호 |
| 발표분야 | C. Energy and the Environment Technology(에너지 및 환경재료) |
| 제목 | Energy density and Temperature Stability of BaTiO3-Bi(Mg,Ti)O3 Complex Perovskite Thin Films Capacitors |
| 초록 | Chemical solution derived thin film synthesis and dielectric characterizations of BaTiO3-Bi(Mg,Ti)O3 pseudocubic complex perovskites have been explored for high energy density capacitor applications. For the maximum energy storage in a limited volume of the capacitive component, capacitance, energy density, dissipation factors, and dielectric strength of the dielectric materials are critical material parameters to be satisfied. High temperature stability of the capacitor’s performance is also required for operations in wide temperature range. The (1-x)BaTiO3-xBi(Mg,Ti)O3 (x＜0.2) thin film samples were fabricated in thickness ~ 500 nm by spinning and subsequent crystallization. These thin films showed nearly linear polarization response over wide range of electric fields, while maintaining high relative dielectric permittivity exceeds 900, that is beneficial to high capacitance density and energy density of the capacitors. Dielectric breakdown strengths of the dense films were as high as 2.6 MV/cm though it depends on its microstructure. The BaTiO3-Bi(Mg,Ti)O3 samples showed very low leakage current densities in magnitudes of 10-9 A/cm2 order even at high temperatures up to 200℃. Based on the structural stability at high temperatures of the pseudocubic perovskite, the high dielectric permittivity and the typical P-E behaviors of the BaTiO3-Bi(Mg,Ti)O3 thin films were also maintained at such high temperatures. Resulting energy density of the 500 nm thick 0.88BaTiO3-0.12Bi(Mg,Ti)O3 thin film was as high as 37 J/cm3 at 1.9 MV/cm. |
| 저자 | 이민혁, 김시원, 권도균 |
| 소속 | 한국항공대 |
| 키워드 | complex perovskite; capacitor; dielectric; film-on-foil |
