Ultrasensitive Memristive Synapses Based on Lightly Oxidized Sulfide Films

Abstract

For biological synapses, high sensitivity is crucial for transmitting information quickly and accurately. Compared to biological synapses, memristive ones show a much lower sensitivity to electrical stimuli since much higher voltages are needed to induce synaptic plasticity. Yet, little attention has been paid to enhancing the sensitivity of synaptic devices. Here, electrochemical metallization memory cells based on lightly oxidized ZnS films are found to show highly controllable memristive switching with an ultralow SET voltage of several millivolts, which likely originates from a two-layer structure of ZnS films, i.e., the lightly oxidized and unoxidized layers, where the filament rupture/rejuvenation is confined to the two-layer interface region several nanometers in thickness due to different ion transport rates in these two layers. Based on such devices, an ultrasensitive memristive synapse is realized where the synaptic functions of both short-term plasticity and long-term potentiation are emulated by applying electrical stimuli several millivolts in amplitude, whose sensitivity greatly surpasses that of biological synapses. The dynamic processes of memorizing and forgetting are mimicked through a 5 × 5 memristive synapse array. In addition, the ultralow operating voltage provides another effective solution to the relatively high energy consumption of synaptic devices besides reducing the operating current and pulse width.

Efficient Passivation with Lead Pyridine‐2‐Carboxylic for High‐Performance and Stable Perovskite Solar Cells

“…Huang et al have proved that GBs are the dominant channels of ions migration and passivating GBs with strong interaction is an efficient way to suppress ions migration. [51] The devices structure is Adv. The bottom electrode is around 10 nm for light transparence and the top electrodes are deposited under the pattern mask with 0.06 cm 2 .…”

Memristive Synapses and Neurons for Bioinspired Computing

“…www.advelectronicmat.de be utilized to mimic LTP with forgetting effect, [159,[161][162][163] STP to LTP transformation, [157,160,[164][165][166][167][168][169][170] metaplasticitry, [112,[171][172][173][174][175] and triplet-STDP. [176][177][178] The device structure, size, switching performance, and emulated synaptic plasticity of the representative memristive devices are summarized in Table 1.…”

“…In particular, the transformation from STP to LTP has been mimicked in a number of memristive devices based on different materials, such as oxides, [121,161,196] sulfides, [160,164] 2D materials, [165,166,170] and biomaterials. These forms of plasticity have been extensively reported in memristive devices involving different switching mechanisms.…”

Near‐Infrared‐Irradiation‐Mediated Synaptic Behavior from Tunable Charge‐Trapping Dynamics

“…[10][11][12][13] Therefore, the emulated synaptic plasticity of STP and LTP render themselves supportive to the sophisticated cognitive function and adaptive behavior pattern.The emphasis on neuroinspired computing so far has been predominantly in electrical stimulation-induced resistance state switching in phase change memories, [14,15] memristors, [16][17][18][19][20][21][22][23][24] as well as transistor-based memories. To achieve artificial synaptic recognition for learning and memory in electronic devices, concomitant plasticity with different timescale is essential.…”

“…The emphasis on neuroinspired computing so far has been predominantly in electrical stimulation-induced resistance state switching in phase change memories, [14,15] memristors, [16][17][18][19][20][21][22][23][24] as well as transistor-based memories. [25][26][27][28][29][30] In contrast with the existing electrical interconnect power loss as well as the limitation in trigger selectivity and spatially confinement inherently from the computing by electric signal, emerging optical stimulation based synaptic devices can tune the synaptic plasticity enormously by photons with low-power and high-efficiency.…”