Influence of Semiconducting Electrodes on Dielectric and yroelectricProperties of Ferroelectric Thin Films
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.
Hui Chen Tiamin Cheng
Shenyang University of Chemical Technology, China
国际会议
哈尔滨
英文
1600-1604
2011-03-26（万方平台首次上网日期，不代表论文的发表时间）