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

Abstract

Highly (100/110) oriented lead-free Li{sub x}(Na{sub 0.5}K{sub 0.5}){sub 1−x}NbO{sub 3} (LNKN, x = 0, 0.02, 0.04, and 0.06) thin films are fabricated on Pt/Ti/SiO{sub 2}/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 (P{sub r} = 14.3 μC/cm{sup 2}), piezoelectric coefficient (d{sub 33} = 48.1 pm/V), and leakage current (<10{sup −5} A/cm{sup 2}) 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.

Authors:
 [1]; ;  [1];  [1];  [2];  [3]
  1. Department of Electrical Engineering, National Cheng Kung University, Tainan 701, Taiwan (China)
  2. Department of Electronic Engineering, National Kaohsiung Normal University, Kaohsiung 802, Taiwan (China)
  3. Department of Digital Game and Animation Design, Tung-Fang Design University, Kaohsiung 829, Taiwan (China)
Publication Date:
OSTI Identifier:
22413186
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 117; Journal Issue: 8; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CHEMICAL BONDS; CONCENTRATION RATIO; CRYSTALLIZATION; DOPED MATERIALS; ELECTRIC FIELDS; ELECTRICAL PROPERTIES; GRAIN SIZE; LEAKAGE CURRENT; LITHIUM COMPOUNDS; MORPHOLOGY; NIOBATES; PIEZOELECTRICITY; POLARIZATION; POTASSIUM COMPOUNDS; SILICON; SILICON OXIDES; SODIUM COMPOUNDS; SOL-GEL PROCESS; SUBSTRATES; THIN FILMS

Citation Formats

Lin, Chun-Cheng, Department of Mathematic and Physical Sciences, R.O.C. Air Force Academy, Kaohsiung 820, Taiwan, Chen, Chan-Ching, Weng, Chung-Ming, Chu, Sheng-Yuan, Center for Micro/Nano Science and Technology, National Cheng Kung University, Tainan 701, Taiwan, Hong, Cheng-Shong, and Tsai, Cheng-Che. Effects of lithium doping on microstructure, electrical properties, and chemical bonds of sol-gel derived NKN thin films. United States: N. p., 2015. Web. doi:10.1063/1.4913708.
Lin, Chun-Cheng, Department of Mathematic and Physical Sciences, R.O.C. Air Force Academy, Kaohsiung 820, Taiwan, Chen, Chan-Ching, Weng, Chung-Ming, Chu, Sheng-Yuan, Center for Micro/Nano Science and Technology, National Cheng Kung University, Tainan 701, Taiwan, Hong, Cheng-Shong, & Tsai, Cheng-Che. Effects of lithium doping on microstructure, electrical properties, and chemical bonds of sol-gel derived NKN thin films. United States. https://doi.org/10.1063/1.4913708
Lin, Chun-Cheng, Department of Mathematic and Physical Sciences, R.O.C. Air Force Academy, Kaohsiung 820, Taiwan, Chen, Chan-Ching, Weng, Chung-Ming, Chu, Sheng-Yuan, Center for Micro/Nano Science and Technology, National Cheng Kung University, Tainan 701, Taiwan, Hong, Cheng-Shong, and Tsai, Cheng-Che. 2015. "Effects of lithium doping on microstructure, electrical properties, and chemical bonds of sol-gel derived NKN thin films". United States. https://doi.org/10.1063/1.4913708.
@article{osti_22413186,
title = {Effects of lithium doping on microstructure, electrical properties, and chemical bonds of sol-gel derived NKN thin films},
author = {Lin, Chun-Cheng and Department of Mathematic and Physical Sciences, R.O.C. Air Force Academy, Kaohsiung 820, Taiwan and Chen, Chan-Ching and Weng, Chung-Ming and Chu, Sheng-Yuan and Center for Micro/Nano Science and Technology, National Cheng Kung University, Tainan 701, Taiwan and Hong, Cheng-Shong and Tsai, Cheng-Che},
abstractNote = {Highly (100/110) oriented lead-free Li{sub x}(Na{sub 0.5}K{sub 0.5}){sub 1−x}NbO{sub 3} (LNKN, x = 0, 0.02, 0.04, and 0.06) thin films are fabricated on Pt/Ti/SiO{sub 2}/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 (P{sub r} = 14.3 μC/cm{sup 2}), piezoelectric coefficient (d{sub 33} = 48.1 pm/V), and leakage current (<10{sup −5} A/cm{sup 2}) 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.},
doi = {10.1063/1.4913708},
url = {https://www.osti.gov/biblio/22413186}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 8,
volume = 117,
place = {United States},
year = {Sat Feb 28 00:00:00 EST 2015},
month = {Sat Feb 28 00:00:00 EST 2015}
}