将二维 (2D) 半导体材料集成到忆阻器结构中,为新兴 2D 材料在广泛的存储器应用领域的应用铺平了道路。氧硒化铋(BioSe)是一种具有高电子迁移率的二维材料,由于其在各个先进应用领域的巨大潜力而引起了人们的广泛研究兴趣。在这里,我们通过交叉点设备探索了少层 BIOSe 的平面外固有开关行为,以应用于导电桥随机存取存储器 (CBRAM) 和用于神经形态计算的人工突触。通过最先进的方法,CVD 生长的 BioSe 纳米板被用作 Al/Cu/BioSe/Pd CBRAM 结构中的开关材料 (SM)。该器件具有 ~90 个连续直流周期,在 1 mA 顺应电流 (CC) 下具有紧密的 SET/RESET 电压分布、超过 10 ks 的保持时间,以及在 Vread 值为 0.1 时显示四种不同状态的多级开关特性, 0.2、0.25和0.3 V。此外,通过调节电导实现了人工突触的增强和抑制。基于 HRTEM 分析,通过 BIOSe 中的 Cu 迁移来解释切换机制。目前的结构显示了未来集成存储器应用的潜力。
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Bi2O2Se-based CBRAM integrated artificial synapse
Integrating two-dimensional (2D) semiconducting materials into memristor structures has paved the way for emerging 2D materials to be employed in a vast field of memory applications. Bismuth oxyselenide (BiOSe), a 2D material with high electron mobility, has attracted significant research interest owing to its great potential in various fields of advanced applications. Here, we explore the out-of-plane intrinsic switching behavior of few-layered BiOSe via a cross point device for application in conductive bridge random access memory (CBRAM) and artificial synapses for neuromorphic computing. Via state-of-the-art methods, CVD-grown BiOSe nanoplate is applied as a switching material (SM) in an Al/Cu/BiOSe/Pd CBRAM structure. The device exhibits ∼90 consecutive DC cycles with a tight distribution of the SET/RESET voltages under a compliance current (CC) of 1 mA, a retention of over 10 ks, and multilevel switching characteristics showing four distinct states at Vread values of 0.1, 0.2, 0.25, and 0.3 V. Moreover, an artificial synapse is realized with potentiation and depression by modulating the conductance. The switching mechanism is explained via Cu migration through BiOSe based on HRTEM analysis. The present structure shows potential for future integrated memory applications.