Sm, Nd doped BiFeO3epitaxial film for photodetector with extremely large on-off current ratio

Xin Zhang; Ziyi Zhang; Chen Jin; Maoru Zhang; Chengyang Bian; Ying Chen; Ruijian Zhu; Zengmei Wang; Zhenxiang Cheng

doi:10.1088/1361-6528/ad2c5d

Sm, Nd doped BiFeO₃epitaxial film for photodetector with extremely large on-off current ratio

Nanotechnology. 2024 Mar 15;35(22). doi: 10.1088/1361-6528/ad2c5d.

Authors

Xin Zhang¹, Ziyi Zhang¹, Chen Jin¹, Maoru Zhang², Chengyang Bian¹, Ying Chen¹, Ruijian Zhu¹, Zengmei Wang², Zhenxiang Cheng³

Affiliations

¹ School of Materials Science and Engineering, Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing Institute of Technology, Nanjing, 211167, People's Republic of China.
² School of Materials Science and Engineering, Jiangsu Key Laboratory of Construction Materials, Southeast University, Nanjing, 211189, People's Republic of China.
³ National Institute for Materials Science (NIMS), Sengen1-2-1, Tsukuba, 305-0047, Japan dInstitute for Superconducting and Electronics Materials, University of Wollongong, Innovation Campus, Fairy Meadow, NSW, 2519, Australia.

PMID: 38387098
DOI: 10.1088/1361-6528/ad2c5d

Abstract

BiFeO₃is one of the star materials in the field of ferroelectric photovoltaic for its relatively narrow bandgap (2.2-2.7 eV) and better visible light absorption. However, a high temperature over 600 °C is indispensable in the usual BiFeO₃growth process, which may lead to impure phase, interdiffusion of components near the interface, oxygen vacancy and ferrous iron ions, which will result in large leakage current and greatly aggravate the ferroelectricity and photoelectric response. Here we prepared Sm, Nd doped epitaxial BiFeO₃film via a rapid microwave assisted hydrothermal process at low temperature. The Bi_0.9Sm_0.5Nd_0.5FeO₃film exhibits narrow bandgap (1.35 eV) and photo response to red light, the on-off current ratio reaches over 10⁵. The decrease in band gap and +2/+3 variable element doping are responsible for the excellent photo response. The excellent photo response performances are much better than any previously reported BiFeO₃films, which has great potential for applications in photodetection, ferroelectric photovoltaic and optoelectronic devices.

Keywords: BiFeO3; on–off ratio; photodetector; small dark current; variable element doping.