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| Home > Publications database > Understanding the Coexistence of Two Bipolar Resistive Switching Modes with Opposite Polarity in Pt/TiO 2 /Ti/Pt Nanosized ReRAM Devices > print |
| 001 | 851649 | ||
| 005 | 20210129234952.0 | ||
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| 100 | 1 | _ | |a Zhang, Hehe |0 P:(DE-Juel1)156365 |b 0 |
| 245 | _ | _ | |a Understanding the Coexistence of Two Bipolar Resistive Switching Modes with Opposite Polarity in Pt/TiO 2 /Ti/Pt Nanosized ReRAM Devices |
| 260 | _ | _ | |a Washington, DC |c 2018 |b Soc. |
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| 520 | _ | _ | |a Redox-type resistive random access memories based on transition-metal oxides are studied as adjustable two-terminal devices for integrated network applications beyond von Neumann computing. The prevailing, so-called, counter-eight-wise (c8w) polarity of the switching hysteresis in filamentary-type valence change mechanism devices originates from a temperature- and field-controlled drift-diffusion process of mobile ions, predominantly oxygen vacancies in the switching oxide. Recently, a bipolar resistive switching (BRS) process with opposite polarity, so-called, eight-wise (8w) switching, has been reported that, especially for TiO2 cells, is still not completely understood. Here, we report on nanosized (<0.01 μm2) asymmetric memristive cells from 3 to 6 nm thick TiO2 films by atomic layer deposition, which reveal a coexistence of c8w and 8w switching in the same cell. As important characteristics for the studied Pt/TiO2/Ti/Pt devices, the resistance states of both modes are nonvolatile and share one common state; i.e., the high-resistance state of the c8w mode equals the low-resistance state of the 8w-mode. A transition between the opposite hysteresis loops is possible by voltage control. Specifically, 8w BRS in the TiO2 cells is a self-limited low-energy nonvolatile switching process. Additionally, the 8w reset process enables the programming of multilevel high-resistance states. Combining the experimental results with data from simulation studies allows to propose a model, which explains 8w BRS by an oxygen transfer process across the Pt/TiO2 Schottky interface at the position of the c8w filament. Therefore, the coexistence of c8w and 8w BRS in the nanoscale asymmetric Pt/TiO2/Ti/Pt cells is understood from a competition between drift/diffusion of oxygen vacancies in the oxide layer and an oxygen exchange reaction across the Pt/TiO2 interface. |
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| 773 | _ | _ | |a 10.1021/acsami.8b09068 |g Vol. 10, no. 35, p. 29766 - 29778 |0 PERI:(DE-600)2467494-1 |n 35 |p 29766 - 29778 |t ACS applied materials & interfaces |v 10 |y 2018 |x 1944-8252 |
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