Data Storage and Neuromorphic Synaptic Properties of Asymmetric (SrTiO3)4/(LiNbO3)1/(LaAlO3)4 Superlattice Ferroelectric Tunnel Junctions

IF 4.7 3区材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

ACS Applied Electronic Materials Pub Date : 2025-09-20 DOI:10.1021/acsaelm.5c01577

Haoming Wei*, , , Shiyu Mao, , , Kunfeng Chen*, , , Yangqing Wu, , , Tengzhou Yang, , and , Bingqiang Cao,

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Abstract

Lithium niobate (LiNbO₃) crystals have attracted significant attention for their exceptional electro-optic and piezoelectric properties. Fabricating LiNbO₃-based ferroelectric tunnel junctions requires a nanoscale LiNbO₃ thin film with superior ferroelectric characteristics. Here, we present (SrTiO₃)₄/(LiNbO₃)₁/(LaAlO₃)₄ superlattices, which exhibit stable polarization switching and enhanced polarization compared to LiNbO₃ thin films. The asymmetric superlattice shows an ON/OFF ratio of ∼10³, with excellent repeatability and multilevel storage capabilities. More interestingly, it simulates various synaptic plastic behaviors, including excitatory postsynaptic current, paired-pulse facilitation, paired-pulse depression, and spike number-dependent plasticity. These findings highlight the great potential of LiNbO₃-based superlattices for memristor devices.

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非对称（SrTiO3）4/(LiNbO3)1/(LaAlO3)4超晶格铁电隧道结的数据存储和神经形态突触特性

铌酸锂（LiNbO3）晶体因其特殊的电光和压电特性而引起了人们的广泛关注。制备基于LiNbO3的铁电隧道结需要具有优异铁电特性的纳米级LiNbO3薄膜。在这里，我们提出了（SrTiO3）4/(LiNbO3)1/(LaAlO3)4超晶格，与LiNbO3薄膜相比，它具有稳定的极化开关和增强的极化。非对称超晶格的开/关比为~ 103，具有优异的可重复性和多层存储能力。更有趣的是，它模拟了各种突触可塑性行为，包括兴奋性突触后电流、成对脉冲促进、成对脉冲抑制和spike数依赖的可塑性。这些发现突出了基于linbo3的超晶格在忆阻器器件中的巨大潜力。

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来源期刊

ACS Applied Electronic Materials Multiple-

CiteScore

7.20

自引率

4.30%

发文量

567

期刊介绍： ACS Applied Electronic Materials is an interdisciplinary journal publishing original research covering all aspects of electronic materials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials science, engineering, optics, physics, and chemistry into important applications of electronic materials. Sample research topics that span the journal's scope are inorganic, organic, ionic and polymeric materials with properties that include conducting, semiconducting, superconducting, insulating, dielectric, magnetic, optoelectronic, piezoelectric, ferroelectric and thermoelectric. Indexed/Abstracted： Web of Science SCIE Scopus CAS INSPEC Portico