Electrical characteristics of the MOD-derived SrBi2xTa2O9 and SrBi2.4(Ta,Nb)2O9 thin films |
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Authors: | Dae Joong Yeon Joo Dong Park Yongwook Kwon Tae Sung Oh |
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Affiliation: | (1) Department of Metallurgical Engineering and Materials Science, Hong Ik University, Seoul, 121-791, South Korea |
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Abstract: | Ferroelectric and leakage current characteristics of the MOD-derived SrBi2xTa2O9 (0.8 x 1.6) and SrBi2.4(Ta1-yNby)2 O9 (0 y 1) thin films were investigated. The SBT and SBTN films were fully crystallized to Bi-layered perovskite structure by annealing at 800°C for 1 hour in oxygen atmosphere. The ferroelectric characteristics of the SBT films were optimized at the Bi/Ta mole ratio x of 1.2. The leakage current density of the Bi-excess SBT films decreased remarkably by the post-metallization annealing at 800°C for 10 minutes in oxygen ambient. The ferroelectric characteristics of the SBTN films were optimized with the SBN content y of 0.25. The SrBi2.4(Ta0.75Nb0.25)2 O9 film exhibited 2Pr and Ec of 19.04 C/cm2 and 24.94 kV/cm at ±5 V, which were superior to 2Pr of 11.3 C/cm2 and Ec of 39.6 kV/cm obtained for the SrBi2.4Ta2O9 film after the post-metallization annealing. The MOD-derived SrBi2.4(Ta0.75Nb0.25)2O9 film did not exhibit the polarization fatigue after 1011 switching cycles at ±5 V. |
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