Overcoming the Fundamental Barrier Thickness Limits of Ferroelectric Tunnel Junctions through BaTiO3/SrTiO3 Composite Barriers

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Title
Overcoming the Fundamental Barrier Thickness Limits of Ferroelectric Tunnel Junctions through BaTiO3/SrTiO3 Composite Barriers
Author(s)
Lingfei Wang; Myung Rae Cho; Yeong Jae Shin; Jeong Rae Kim; Saikat Das; Jong-Gul Yoon; Jin-Seok Chung; Tae Won Noh
Publication Date
2016-05
Journal
NANO LETTERS, v.16, no.6, pp.3911 - 3918
Publisher
AMER CHEMICAL SOC
Abstract
Ferroelectric tunnel junctions (FTJs) have attracted increasing research interest as a promising Candidate for nonvolatile memories. Recently, significant enhancements Of tunneling electroresistance (TER) have been realized through modifications of electrode materials. However, direct control of the FTJ performance through modifying the tunneling barrier has not been adequately explored. Here, adding a new direction to FTJ research, we fabricated FTJs with BaTiO3 single barriers (SB-FTJs) and BaTiO3/SrTiO3 composite barriers (CB-FTJs) and reported a systematic study of FTJ performances by varying the barrier thicknesses and compositions:, For the SB-FTJs, the TER is limited by pronounced leakage current for ultrathin barriers and extremely small tunneling current for thick barriers. For the CB-FTJs, the extra SrTiO3 barrier provides an additional degree of freedom to modulate the barrier potential and tunneling behavior. The resultant high tunability can be utilized to overcome the barrier thickness limits and enhance the overall CB-FTJ performances beyond those of SB-FTJ. Our results reveal a new paradigm to manipulate the FTJs through functionalities. © 2016 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/2670
ISSN
1530-6984
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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