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Functional Inorganic Materials and Devices
High-Performance Photovoltaic Readable Ferroelectric Nonvolatile Memory Based on La Doped BiFeO Films 3
Dong Li, Dongxing Zheng, Chao Jin, Wanchao Zheng, and Haili Bai ACS Appl. Mater. Interfaces, Just Accepted Manuscript • DOI: 10.1021/acsami.8b06246 • Publication Date (Web): 21 May 2018 Downloaded from http://pubs.acs.org on May 21, 2018
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ACS Applied Materials & Interfaces
High-Performance Photovoltaic Readable Ferroelectric Nonvolatile Memory Based on La Doped BiFeO3 Films
Dong Li, Dongxing Zheng, Chao Jin, Wanchao Zheng and Haili Bai∗
Tianjin Key Laboratory of Low Dimensional Materials Physics and Processing Technology, Institute of Advanced Materials Physics, Faculty of Science, Tianjin University, Tianjin 300350, PRC
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Author to whom all correspondence should be addressed. E-mail:
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ABSTRACT
Epitaxial La0.1Bi0.9FeO3 (LBFO) films with SrRuO3 (SRO) bottom electrodes were fabricated on SrTiO3 (001) substrates by magnetron sputtering. The LBFO thin films exhibit strong ferroelectric properties. Electric field controlled nonvolatile reversible resistance switchings and switchable photovoltaic effects have been observed in Pt/LBFO/SRO heterostructures. With the optimized LBFO film thickness, the observed room temperature pulsed-read resistance switching ratio can reach 105 % magnitude by applying ±2.7 V pulse voltages. Besides, the observed ferroelectric switchable photovoltaic effect in the visible wavelength range shows a large tunable open-circuit photovoltage from –75 to –330 mV. The switching mechanisms in resistance and photovoltaic effects are demonstrated to be directly related to the ferroelectric reversal, which can be attributed to the polarization modulated interfacial barriers and deep trap states.
Keywords: bismuth ferrite, polarization, resistance switching, photovoltaic effect, heterostructure
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ACS Applied Materials & Interfaces
INTRODUCTION
Based on the ferroelectric spontaneous polarization and electric driven rapid inversion, ferroelectric random access memories (FeRAMs) have been designed for high speed and density information storage.1, 2 Compared with the magnetic random access memories (MRAMs), FeRAMs have significant advantages in the switching speed and the resistance ratio.3 While in conventional ferroelectric memories, the read-out of information is performed by the detection of polarization switching current, which is a destructive reading process and severely limits its utility.4 To search for the non-destructive read-out solutions, the ferroelectric related resistance and photovoltaic switchings have been studied in depth recently.5-8 Remarkable resistive switchings has been observed in several reports based on ultrathin (
