Influence of Semiconducting Electrodes on Dielectric and Pyroelectric Properties of Ferroelectric Thin Films

Abstract:

The dielectric and pyroelectric properties of ferroelectric thin films coated with two semiconducting electrodes are studied in the frame work of Ginzburg-Landau-Devonshire theory. Due to the depolarization effect produced by the surface polar charges cannot be completely screened, the contribution of the semiconducting electrodes is included in the free-energy functional. The dielectric susceptibility and the pyroelectric coefficient are calculated respectively as functions of temperature and film thickness. A comparison with the results of investigations performed for perfectly conducting electrodes shows that the effects of semiconducting electrodes can induce a transition from the ferroelectric phase to paraelectric phase, changing the phase transition from the second order to first order, and greatly improving the dielectric susceptibility and pyroelectric coefficient.

• Periodical: Advanced Materials Research (Volumes 183-185)
• Pages: 1600-1604
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.183-185.1600
• Online since: January 2011
• Authors: Hui Chen, Tia Min Cheng
• Keywords: Curie Temperature, Dielectric Susceptibility, Ferroelectric Thin Film, Pyroelectric Coefficient

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