Ferroelectric Tunnel Junction for Dense Cross-Point Arrays.

Abstract

Cross-point array (CPA) structure memories using a memristor are attracting a great deal of attention due to their high density integration with a 4F2 cell. However, a common significant drawback of the CPA configuration is crosstalk between cells. To date, the CPA structure using a redox-based memristor has restrictions to minimize the operating current level due to their resistive switching mechanism. This study demonstrates suitable characteristics of a ferroelectric tunnel junction (FTJ) for the memristor of the CPA structure using an electrostatic model. From the FTJ of the Au/p-type Pr0.98Ca0.02MnO3 (4 nm)/BaTiO3 (4.3 nm)/n-type Ca0.98Pr0.02MnO3 (3 nm)/Pt(111) structure, which has a higher and thicker potential barrier, a good memristive effect for the CPA structure with a high nonlinear current-voltage curve and low current operation, was obtained by Δ Fowler-Nordheim tunneling with effectively blocked direct tunneling and thermionic emission. The FTJ demonstrated reduced sneak current and the possible for high nonlinearity.

DOI: 10.1021/acsami.5b06117

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Cite this paper

@article{Lee2015FerroelectricTJ, title={Ferroelectric Tunnel Junction for Dense Cross-Point Arrays.}, author={Hong-Sub Lee and Wooje Han and Hee-Yoon Chung and M. J. Rozenberg and Kangsik Kim and Zonghoon Lee and Geun Young Yeom and Hyung-Ho Park}, journal={ACS applied materials & interfaces}, year={2015}, volume={7 40}, pages={22348-54} }