Effects of lithium doping on microstructure, electrical properties, and chemical bonds of sol-gel derived NKN thin films

Chun Cheng Lin, Chan Ching Chen, Chung Ming Weng, Sheng-Yuan Chu, Cheng Shong Hong, Cheng Che Tsai

研究成果: Article

7 引文 斯高帕斯(Scopus)

摘要

Highly (100/110) oriented lead-free Lix(Na0.5K0.5)1-xNbO3 (LNKN, x = 0, 0.02, 0.04, and 0.06) thin films are fabricated on Pt/Ti/SiO2/Si substrates via a sol-gel processing method. The lithium (Li) dopants modify the microstructure and chemical bonds of the LNKN films, and therefore improve their electrical properties. The optimal values of the remnant polarization (Pr = 14.3 μC/cm2), piezoelectric coefficient (d33 = 48.1 pm/V), and leakage current (<10-5 A/cm2) are obtained for a lithium addition of x = 0.04 (i.e.; 4 at. %). The observation results suggest that the superior electrical properties are the result of an improved crystallization, a larger grain size, and a smoother surface morphology. It is shown that the ion transport mechanism is dominated by an Ohmic behavior under low electric fields and the Poole-Frenkel emission effect under high electric fields.

原文English
文章編號085307
期刊Journal of Applied Physics
117
發行號8
DOIs
出版狀態Published - 2015 二月 28

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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