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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.
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1 Guilin University of Electronic Technology, Guangxi Key Laboratory of Information Materials, Guilin, China (GRID:grid.440723.6) (ISNI:0000 0001 0807 124X); Guilin University of Electronic Technology, College of Material Science and Engineering, Guilin, China (GRID:grid.440723.6) (ISNI:0000 0001 0807 124X)
2 Guangxi University, School of Resources, Environment and Materials, Nanning, China (GRID:grid.256609.e) (ISNI:0000 0001 2254 5798)
3 Guilin University of Electronic Technology, College of Material Science and Engineering, Guilin, China (GRID:grid.440723.6) (ISNI:0000 0001 0807 124X)
4 Guilin University of Electronic Technology, Guangxi Key Laboratory of Information Materials, Guilin, China (GRID:grid.440723.6) (ISNI:0000 0001 0807 124X); Guilin University of Electronic Technology, College of Material Science and Engineering, Guilin, China (GRID:grid.440723.6) (ISNI:0000 0001 0807 124X); Chinese Academy of Sciences, Institute of Physics, Beijing, China (GRID:grid.9227.e) (ISNI:0000000119573309)