標題: Impact of the Stacking Order of HfOX and AlOX Dielectric Films on RRAM Switching Mechanisms to Behave Digital Resistive Switching and Synaptic Characteristics
作者: Chuang, Kai-Chi
Chu, Chi-Yan
Zhang, He-Xin
Luo, Jun-Dao
Li, Wei-Shuo
Cheng, Huang-Chung
電子工程學系及電子研究所
Department of Electronics Engineering and Institute of Electronics
關鍵字: Resistive random access memory (RRAM);bilayered dielectric films;synaptic characteristics;diffusion limiting layer (DLL);conductive filament (CF);spike-timing-dependent plasticity (STDP)
公開日期: 1-Jan-2019
摘要: Resistive random access memory (RRAM) devices with analog resistive switching are expected to be beneficial for neuromorphic applications, and consecutive voltage sweeps or pulses can be applied to change the device conductance and behave synaptic characteristics. In this paper, RRAM devices with a reverse stacking order of 6-nm-thick HfOx and 2-nm-thick AlOx dielectric films were fabricated. The device with TiN/Ti/AlOx/HfOx/TiN stacked layers exhibited digital resistive switching, while the other device with TiN/Ti/HfOx/AlOx/TiN stacked layers could demonstrate synaptic characteristics that were analog set and reset processes under consecutive positive and negative voltage sweeps or a train of potentiation and depression pulses. Moreover, this device could also implement synaptic learning rules, spike-timing-dependent plasticity (STDP). Varying temperature measurements and linear fittings of the measured data were conducted to analyze current conduction mechanisms. As a result, the variation of resistive switching behavior between these two devices is attributed to the varying effectiveness of the oxygen scavenging ability of the Ti layer when put into contact with either AlOx or HfOx. Moreover, AlOx functioned as a diffusion limiting layer (DLL) in the device with TiN/Ti/HfOx/AlOx/TiN stacked layers, and gradual modulation of the production and annihilation of oxygen vacancies is the cause of synaptic characteristics .
URI: http://dx.doi.org/10.1109/JEDS.2019.2915975
http://hdl.handle.net/11536/152400
ISSN: 2168-6734
DOI: 10.1109/JEDS.2019.2915975
期刊: IEEE JOURNAL OF THE ELECTRON DEVICES SOCIETY
Volume: 7
Issue: 1
起始頁: 589
結束頁: 595
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