Microstructure-dependent leakage-current properties of solution-derived (K0.5Na0.5)NbO3 thin films

被引：14

作者：

Kupec, Alja ^{[1
]}

Ursic, Hana ^{[1
]}

Frunza, Raluca C. ^{[1
]}

Tchernychova, Elena ^{[1
]}

Malic, Barbara ^{[1
]}

机构：

[1] Jozef Stefan Inst, Ljubljana 1000, Slovenia

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2015年 / 35卷 / 13期

关键词：

Thin film; (K0.5Na0.5)NbO3; Leakage current; Microstructure; Local conductive measurement; CHARGE-LIMITED CURRENTS;

D O I：

10.1016/j.jeurceramsoc.2015.05.019

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In the present study we clearly demonstrate the relationships between the microstructural details of lead-free ferroelectric (K0.5Na0.5)NbO3 thin films, synthesized from alkoxide-based solutions, and their leakage-current behaviours. The approximately 250-nm-thick films deposited from the 10 and 5 mol% excess potassium-acetate solutions and annealed at 750 degrees C possessed coarse-grained, columnar or fine-grained, equiaxed microstructures, respectively. The latter exhibited a current density of 2.9 x 10(-7) A/cm(2) at 50 kV/cm, whereas the value increased by two orders of magnitude in the films with the columnar grains. Transmission electron microscopy investigations showed the presence of amorphous material that wetted the boundaries of the columnar grains. Using conductive atomic force microscopy we obtained direct evidence that the current starts to flow initially along the boundaries of the columnar grains, thus unambiguously demonstrating the leakage mechanism at the sub-micron level. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：3507 / 3511

页数：5

共 24 条

[1] Dielectric and ferroelectric properties of strain-relieved epitaxial lead-free KNN-LT-LS ferroelectric thin films on SrTiO3 substrates [J].