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Title: Leakage current and pyroelectric properties of compositionally graded (Pb, Ca)TiO3 films
Authors: Tang, XG
Wang, J
Zhang, YW
Chan, HLW 
Ding, AL
Choy, CL 
Issue Date: 2004
Publisher: Springer
Source: Applied physics. A, Materials science & processing, 2004, v. 78, no. 8, p. 1205-1209 How to cite?
Journal: Applied physics. A, Materials science & processing 
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 solgel 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.
ISSN: 0947-8396
EISSN: 1432-0630
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