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Leakage current and pyroelectric properties of compositionally graded (Pb,Ca)TiO3 films

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Abstract

Highly (100)-oriented, compositionally graded (Pb,Ca)TiO3 (PCT) thin films with a Ca content from 0 to 24 mol % on Pt/Ti/SiO2/Si substrates were prepared by a sol-gel process. The graded structure of the Au/PCT/Pt film capacitor showed a well-saturated hysteresis loop at an applied field of 500 kV/cm with remanent polarization (Pr), and coercive electric field (Ec) values of 9.35 μC/cm2 and 130 kV/cm, respectively. At 100 kHz, the dielectric constant and dielectric loss of the film were 129 and 0.024, respectively. The leakage current density of the graded PCT film was less than 1.0×10-7 A/cm2 over a voltage range from 0 to 4 V. The conduction current depended on the voltage polarity. At low electric field (110 and 180 kV/cm, respectively, for Pt and Au electrodes biased negatively), the Au/PCT and PCT/Pt interfaces form a Schottky barrier. At high electric field (>110 kV/cm), the Au electrode biased negatively shows space-charge-limited current (SCLC) behavior. The temperature dependencies of the pyroelectric coefficients of the graded PCT film were measured by a dynamic technique. From 20 to 82 °C, the pyroelectric coefficients of graded PCT film remain steady in the range 106 to 118 μC/m2 K. The detectivity figure of merit (FD) of the graded PCT film was 6.7×10-6 Pa-0.5.

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Authors and Affiliations

  1. Department of Applied Physics and Materials Research Centre, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, P.R. China

    X.G. Tang, J. Wang, Y.W. Zhang, H.L.W. Chan & C.L. Choy

  2. Shanghai Institute of Ceramics, Chinese Academy of Sciences, 200050, Shanghai, P.R. China

    A.L. Ding

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  1. X.G. Tang
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  2. J. Wang
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  3. Y.W. Zhang
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  4. H.L.W. Chan
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  5. A.L. Ding
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  6. C.L. Choy
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Corresponding author

Correspondence to X.G. Tang.

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PACS

77.80.-s; 77.70.+a; 77.22.-d; 51.50.+v; 68.37.-d

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Tang, X., Wang, J., Zhang, Y. et al. Leakage current and pyroelectric properties of compositionally graded (Pb,Ca)TiO3 films. Appl. Phys. A 78, 1205–1209 (2004). https://doi.org/10.1007/s00339-003-2198-1

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  • DOI: https://doi.org/10.1007/s00339-003-2198-1

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