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• W4386854053 abstract "Although resistance switching in transition-metal oxide (TMO) films has been widely studied [1], the physics and chemistry of resistance switching in non-transition-metal oxide (nTMO) films remains under-studied [2]. This must be corrected because inexpensive and chemically stable device configurations are required for the future Internet-of-Things society. It is easily anticipated that the switching electric field of silicon oxide films is apt to be higher than that of TMO films because the dielectric constant of silicon oxide films is smaller than those of the TMO films. However, the use of two-layer stacks like SiOx/hi- k oxide reduces the switching electric field [3]. Therefore, the study of silicon oxide films is still meaningful. Many scientists have recently investigated resistance switching in sputter-deposited silicon oxide films in detail [4,5] because this structure dispenses with the TMO (Fig. 1). Many papers addressed the role of silicon sub-oxide (SiOx) [6] because it is anticipated that the unstable bonds of non-stoichiometric silicon oxide can create degraded, but reversible, conductive paths inside the film. However, it is not yet clear how the SiOx region can trigger resistance switching, how important the SiOx region is, and whether the SiOx region is the only determiner of resistance switching [7] (Figs. 2, 3). The author demonstrated that hot-electron injection from the Si substrate had great potential in triggering resistance switching and lowering the switching voltage of sputter-deposited Si oxide films [5,8]; it was also mentioned that Si precipitates played an important role in realizing repeatable bipolar switching [9] (Fig. 2). Relating to this study, the author also proposed the physical and chemical structure of conductive filaments and their switching behavior based on an analysis of a possibly equivalent circuit model [10] (Fig. 4). However, it was not definitely elucidated why unipolar switching is not easily observed in sputter-deposited silicon oxide films, even though it is not a TMO. Recently, the author performed various Monte Carlo simulations to elucidate the physical and chemical parameters that rule the unipolar switching process in sputter-deposited silicon oxide films. Generations of simple bond breaking, oxygen vacancies, metallic Si sites, and E’’ centers were implemented in the simulation algorithm [8]. All-positive voltage stress mode for both the electroforming process and the reset process will not yield devices with stable, repeatable switching [11]. On the other hand, the all-negative stress mode results in stable, repeatable switching because the recovery of the internal degradation of the Si oxide film is not completed [11] (Fig. 5). This difference stems from the physical asymmetry of the electrode materials (Fig. 1). Though some may consider that silicon oxide films are not preferable to ReRAM devices from the chemical points of view, the theoretical analysis provided by the author in this paper suggests that silicon oxide films can be applied to the ReRAM device. [1] Y. Tokura, Physics Today , vol. 56, pp. 50-55, 2003. [2] T. Yanagida, et al ., Sci. Rep. , vol. 3, No.1657, pp.1-6, 2013. [3] P. Broqvist and A. Pasquarello, Appl. Phys. Lett., vol. 91, 192905, 2007. [4] J. Yao, et al ., Appl. Phys. Lett , vol. 93, pp. 253101-1-253101-3, 2008. [5] R. Yamaguchi, S. Sato, and Y. Omura, Jpn. J. Appl. Phys. , vol. 56, pp. 041301-1-041301-6, 2017. [6] A. Mehonic, et al. , J. Appl. Phys. , vol. 111, pp. 074507-1-074507-9, 2012. [7] Y. Wang, et al ., Appl. Phys. Lett ., vol.102, pp. 042103-1-042103-5, 2013. [8] Y. Omura, Ind. J. Electrical Eng. & Comput. Sci ., vol. 24, pp. 1367-1378, 2021. [9] Y. Omura, R. Yamaguchi, and S. Sato, IEEE Trans. Device Reliab. and Mat . Vol. 17, pp. 561-567 (2017). [10] Y. Omura, ECS J. Solid State Sci. and Technol ., vol. 10, pp. 124006-1-124006-10, 2021. [11] Y. Omura, Materials Today Proc ., vol. 20, pp. 273-282, 2020; the advanced study will be published in the ECS J. Solid State Sci. and Technol . Figure 1" @default.
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• W4386854053 date "2023-08-28" @default.
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• W4386854053 title "(Invited) Potential of Silicon Oxide Films for Low-Cost and High-Performance Resistive Switching Devices" @default.
• W4386854053 doi "https://doi.org/10.1149/ma2023-01331854mtgabs" @default.
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