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journal article·2022-12

Revealing Resistive Switching Mechanism in CaFeOx Perovskite System with Electroforming‐Free and Reset Voltage‐Controlled Multilevel Resistance Characteristics

Hung‐Yang Lo, Chun‐Wei Huang, Chun‐Chien Chiu, Jui‐Yuan Chen, Fang‐Chun Shen, Che‐Hung Wang, Yen‐Jung Chen, Chien‐Hua Wang, Jan‐Chi Yang, Wen‐Wei Wu

Small· Volume 18· Issue 51
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Source abstract

Abstract

Abstract Recently, perovskite (PV) oxides with ABO3 structures have attracted considerable interest from scientists owing to their functionality. In this study, CaFeOx is introduced to reveal the resistive switching properties and mechanism of oxygen vacancy transition in PV and brownmillerite (BM) structures. BM‐CaFeO2.5 is grown on an Nb‐STO conductive substrate epitaxially. CaFeOx exhibits excellent endurance and reliability. In addition, the CaFeOx also demonstrates an electroforming‐free characteristic and multilevel resistance properties. To construct the switching mechanism, high‐resolution transmission electron microscopy is used to observe the topotactic phase change in CaFeOx. In addition, scanning TEM and electron energy loss spectroscopy show the structural evolution and valence state variation of CaFeOx after the switching behavior. This study not only reveals the switching mechanism of CaFeOx, but also provides a PV oxide option for the dielectric material in resistive random‐access memory (RRAM) devices.
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Research context

Electronic materials

OpenAlex topics: Advanced Memory and Neural Computing · Transition Metal Oxide Nanomaterials · Electronic and Structural Properties of Oxides

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Materials Science and Engineering National Yang Ming Chiao Tung University No.1001, University Rd., East Dist. Hsinchu City 30010 Taiwan (R.O.C.)

Department of Materials Science and Engineering Feng Chia University No. 100, Wenhwa Rd., Seatwen Dist. Taichung City 407802 Taiwan (R.O.C.)

Department of Physics National Cheng Kung University No.1, University Rd., East Dist. Tainan City 701 Taiwan (R.O.C.)

Department of Materials Science and Engineering National United University No. 2, Lienda, Miaoli City Miaoli County 360302 Taiwan (R.O.C.)

Center for the Intelligent Semiconductor Nano‐system Technology Research National Yang Ming Chiao Tung University 300 Hsinchu Taiwan

Funding

Ministry of Science and Technology · Ministry of Science and Technology, Taiwan

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