Preparation of Ag-alloy top-electrode for ferrolectric films.

点击翻译按钮获取中文摘要

An Ag-alloy (97Ag-1Pd-2Cu in mol%) was proposed as a new top-electrode for lead zirconate titanate (PZT) films.1. The composition of the Ag-alloy was examined. The insulation resistance of the electrode has improved to the electrode of the composition which adds Pd of 0.1% or more to the pure silver. A heat-resistant, the insulation resistance, and adhesion characteristic have improved to the electrode of the composition which does Cu from 0.1 to 5% to the virgin silver.2. PZT ferroelectric thin film was prepared on the Pt/Ti/SiO_2/Si substrate by chemical solution deposition method (CSD method). Pt and the Ag-alloy top-electrode of 0.5mm in the diameter were made on this PZT thin film by the sputtering method. The obtained film was heat-treated by the oxygen and hydrogen atmosphere (N_2-4%H_2), and the following knowledge was obtained.(1) Oxygen atmosphereIt has been understood for both Pt and the Ag-alloy electrode to be able to maintain excellent ferroelectricity up to 500℃.(2) Hydrogen atmosphereIn the case of Pt top-electrode, the ferroelectricity of PZT films disappeared after annealing over 3CO℃. Exfoliations of Pt bottom-electrode from substrate were observed after annealing over 300℃.In the case of the Ag-alloy top-electrode, no chemical reaction between the Ag-alloy electrode and PZT film was observed after annealing at 400℃. The ferroelectricity of PZT film was maintain ed even after annealing at 350℃ using the Ag-alloy electrode.It is guessed that the Ag alloy electrode developed by this research can be used as new electrode for ferroelectric materials.