Electrical and Thermal Dynamics of Self-Oscillations in TaO x -Based Threshold Switching Devices
Electrical and Thermal Dynamics of Self-Oscillations in TaO x -Based Threshold Switching Devices
复制标题
TaO x 阈值开关器件中自振荡的电动力学和热动力学
DOI：
10.1021/acsaelm.9b00782
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发表时间：
2020
影响因子：
4.7
通讯作者：
Skowronski, Marek
中科院分区：
文献类型：
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作者：
Yu, Yiqi;Zhao, Bingyuan;Goodwill, Jonathan M.;Ma, Yuanzhi;Bain, James A.;Skowronski, Marek
我们目前的实验结果的弛豫振荡的基础上TaOx阈值开关器件作为一个功能的电压，负载电阻，和并联电容。特别感兴趣的是器件的ON和OFF状态之间的转换的动态，其施加振荡频率的上限。动态已被捕获的有限元模型，仅使用电导率与温度和热激活的电导率作为输入数据。该模型再现了电流和电压波形，并允许在振荡期间跟踪器件内电流密度和温度分布的变化。两者在每个循环中都经历显著的呼吸模式类型变化，因为在电容放电/加热阶段期间电流自发收缩。该模型指出了实现更高振荡频率的可能途径。
We present experimental results of relaxation oscillations based on the TaOxthreshold switching devices as a function of voltage, load resistance, and the parallel capacitance. Of particular interest are the dynamics of transitions between ON and OFF states of the device which impose an upper limit of the oscillation frequency. The dynamics have been captured by the finite element electrothermal model using only electrical conductivity vs temperature and thermally activated conductivities as input data. The model reproduced current and voltage waveforms and allowed for following the changes in current density and temperature distributions within the device during oscillations. Both undergo significant breathing-mode-type changes in each cycle as the current spontaneously constricts during the capacitance discharge/heating stage. The model points out the possible approaches toward achieving higher oscillation frequencies.