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In this work, the (1-x)Bi0.5Na0.5TiO3-xBaNi0.5Nb0.5O3 (BNT-BNN; 0.00 ≤ x ≤ 0.20) ceramics were prepared via a high-temperature solid-state method. The crystalline structures, photovoltaic effect, and electrical properties of the ceramics were investigated. According to X-ray diffraction, the system shows a single perovskite structure. The samples show the normal ferroelectric loops. With the increase of BNN content, the remnant polarization (Pr) and coercive field (Ec) decrease gradually. The optical band gap of the samples narrows from 3.10 to 2.27 eV. The conductive species of grains and grain boundaries in the ceramics are ascribed to the double ionized oxygen vacancies. The open-circuit voltage (Voc) of ~15.7 V and short-circuit current (Jsc) of ~1450 nA/cm2 are obtained in the 0.95BNT-0.05BNN ceramic under 1 sun illumination (AM1.5G, 100 mW/cm2). A larger Voc of 23 V and a higher Jsc of 5500 nA/cm2 are achieved at the poling field of 60 kV/cm under the same light conditions. The study shows this system has great application prospects in the photovoltaic field.


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Photocurrent density and electrical properties of Bi0.5Na0.5TiO3-BaNi0.5Nb0.5O3 ceramics

Show Author's information Mingqiang ZHONGa,bQin FENGcChanglai YUANa,b( )Xiao LIUa,bBaohua ZHUbLiufang MENGbChangrong ZHOUa,bJiwen XUa,bJiang WANGa,b( )Guanghui RAOa,b,d( )
Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China
College of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China
School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Abstract

In this work, the (1-x)Bi0.5Na0.5TiO3-xBaNi0.5Nb0.5O3 (BNT-BNN; 0.00 ≤ x ≤ 0.20) ceramics were prepared via a high-temperature solid-state method. The crystalline structures, photovoltaic effect, and electrical properties of the ceramics were investigated. According to X-ray diffraction, the system shows a single perovskite structure. The samples show the normal ferroelectric loops. With the increase of BNN content, the remnant polarization (Pr) and coercive field (Ec) decrease gradually. The optical band gap of the samples narrows from 3.10 to 2.27 eV. The conductive species of grains and grain boundaries in the ceramics are ascribed to the double ionized oxygen vacancies. The open-circuit voltage (Voc) of ~15.7 V and short-circuit current (Jsc) of ~1450 nA/cm2 are obtained in the 0.95BNT-0.05BNN ceramic under 1 sun illumination (AM1.5G, 100 mW/cm2). A larger Voc of 23 V and a higher Jsc of 5500 nA/cm2 are achieved at the poling field of 60 kV/cm under the same light conditions. The study shows this system has great application prospects in the photovoltaic field.

Keywords:

Bi0.5Na0.5TiO3-BaNi0.5Nb0.5O3, ferroelectric semiconductors, optical band gap, photovoltaic effect, impedance spectroscopy
Received: 25 January 2021 Revised: 09 May 2021 Accepted: 10 May 2021 Published: 19 July 2021 Issue date: October 2021
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Publication history
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Publication history

Received: 25 January 2021
Revised: 09 May 2021
Accepted: 10 May 2021
Published: 19 July 2021
Issue date: October 2021

Copyright

© The Author(s) 2021

Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Grant No. 11464006) and Guangxi Key Laboratory of Information Materials (Grant No. 191026-Z).

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