Structure and electrical properties of (111)-oriented Pb(Mg1/3Nb2/3)O3-PbZrO3-PbTiO3 thin film for ultra-high-frequency transducer applications

• Published in: IEEE transactions on ultrasonics, ferroelectrics, and frequency control Vol. 58; no. 9; pp. 1962 - 1967
• Main Authors: Ben Peng Zhu, Wan Ke Guo, Guo Zhen Shen, Qifa Zhou, Shung, K. K.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.09.2011; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Acoustics; Crystals; Dielectric constant; Educational institutions; Electric fields; Electrodes; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Leakage current; Physics; Transduction; acoustical devices for the generation and reproduction of sound; Polarization; Electrical properties; Lead titanates; X ray diffraction; Layer thickness; Thin film; Transmission electron microscopy; Silicon oxides; Coercive force; Lead magnesium niobate; Magnesium Niobates; Leakage current; Property structure relationship; Lead Niobates; High frequency; Ultrasonic transducer
• ISSN: 0885-3010; 1525-8955
• DOI: 10.1109/TUFFC.2011.2038

Ternary lead magnesium niobate-lead zirconate titanate system 0.4Pb(Mg 1/3 Nb 2/3 )O 3 -0.25PbZrO 3 0.35PbTiO 3 (40PMN-25PZ-35PT) thin film with a thickness of 1.5 μm was grown on Pt(111)/Ti/SiO 2 /Si substrate via chemical solution deposition. X-ray diffraction and transmission electron microscopy results suggested the film obtained was highly (111)-oriented. The remanent polarization and coercive electric field of the film were found to be 25.5 μC/cm 2 and 51 kV/cm, respectively. In addition, at 1 kHz, the dielectric constant was measured to be 1960 and the dielectric loss 0.036. The film was observed to undergo a diffuse ferroelectricto-paraelectric phase transition at around 209°C. The leakage current appeared to depend on the voltage polarity. If the Au electrode was biased positively, the leakage current was dominated by the Schottky emission mechanism. When the Pt electrode was biased positively, the conduction current curve showed an ohmic behavior at a low electric field and space-charge-limited current characteristics at a high electric field.