Effect of crystallization temperature on energy-storage density and efficiency of lead-free Bi0.5(Na0.8K0.2)0.5TiO3 thin films prepared by sol–gel method

Nguyen Dang Co; Le Viet Cuong; Bui Dinh Tu; Pham Duc Thang; Luong Xuan Dien; Vu Ngoc Hung; Ngo Duc Quan

Journal of Science: Advanced Materials and Devices (Sep 2019)

Effect of crystallization temperature on energy-storage density and efficiency of lead-free Bi0.5(Na0.8K0.2)0.5TiO3 thin films prepared by sol–gel method

Nguyen Dang Co,
Le Viet Cuong,
Bui Dinh Tu,
Pham Duc Thang,
Luong Xuan Dien,
Vu Ngoc Hung,
Ngo Duc Quan

Affiliations

Nguyen Dang Co: Faculty of Engineering Physics and Nanotechnology, VNU-University of Engineering and Technology, 144 Xuan Thuy Road, Cau Giay District, Hanoi, 100000, Viet Nam
Le Viet Cuong: Faculty of Engineering Physics and Nanotechnology, VNU-University of Engineering and Technology, 144 Xuan Thuy Road, Cau Giay District, Hanoi, 100000, Viet Nam
Bui Dinh Tu: Faculty of Engineering Physics and Nanotechnology, VNU-University of Engineering and Technology, 144 Xuan Thuy Road, Cau Giay District, Hanoi, 100000, Viet Nam
Pham Duc Thang: Faculty of Engineering Physics and Nanotechnology, VNU-University of Engineering and Technology, 144 Xuan Thuy Road, Cau Giay District, Hanoi, 100000, Viet Nam
Luong Xuan Dien: School of Chemical Engineering, Hanoi University of Science and Technology, No.1 Dai Co Viet, Hanoi, 100000, Viet Nam
Vu Ngoc Hung: International Institute for Materials Science, Hanoi University of Science and Technology, No.1 Dai Co Viet, Hanoi, 100000, Viet Nam
Ngo Duc Quan: International Institute for Materials Science, Hanoi University of Science and Technology, No.1 Dai Co Viet, Hanoi, 100000, Viet Nam; School of Engineering Physics, Hanoi University of Science and Technology, No.1 Dai Co Viet, Hanoi, 100000, Viet Nam; Corresponding author. International Institute for Materials Science, Hanoi University of Science and Technology, No.1 Dai Co Viet, Hanoi, 100000, Viet Nam.

Journal volume & issue: Vol. 4, no. 3
pp. 370 – 375

Abstract

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Lead-free Bi0.5(Na0.80K0.20)0.5TiO3 (BNKT) ferroelectric films were synthesized on Pt/Ti/SiO2/Si substrates via the chemical solution deposition. The influence of the crystallization temperature on the microstructures, the ferroelectric and energy-storage properties of the films was investigated in detail. The results showed that the BNKT films have reached the well crystallized state in the single-phase perovskite structure at 700 °C. Ferroelectric and energy-storage properties of the films were significantly enhanced by increasing the crystallization temperature. The remnant polarization (2Pr) and maximum polarization (2Pm) reached the highest values of 18.4 μC/cm2 and 61.2 μC/cm2, respectively, under an applied electric field of 300 kV/cm. Thanks to the strong enhancement in 2Pm and the large Pmax - Pr value, the highest energy-storage density (Jreco) and efficiency of 2.3 J/cm3 and 58.2%, respectively, were obtained. These results indicate that the BNKT films have application potentials in advanced capacitors. Keywords: Energy-storage, Ferroelectric, Sol–gel, Film, Lead-free

Published in Journal of Science: Advanced Materials and Devices

ISSN: 2468-2284 (Print); 2468-2179 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/journal-of-science-advanced-materials-and-devices

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