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- W1998346987 abstract "As a next-generation memory, we have developed a rare-metal-free memory using Al oxide with a high-density of oxygen vacancies (Vos). The electronic structure has been simulated using first-principles calculations. In this paper, we report the electronic structure of the band gap, analyzed using thermally stimulated current measurements, to evaluate the simulated results. We observed electronic states corresponding to resistance changes for the first time. These results show that Vo+2 (electron empty Vo) changes to Vo+1 by electron injection; the overlapped Vo+1 electron changes into a “Vo conduction band” (VoCB), and the changed structure is stabilized by structural relaxation of Al ions around Vo. VoCB is considered as a kind of mid-gap impurity band. The origin of the on/off switching is considered to be generation/degeneration of the VoCB caused by increasing/decreasing numbers of Vo electrons. Based on knowledge of the electronic mechanism, we have changed metal/insulator/metal structure to a metal/insulator/semiconductor structure and decreased the reset-current to 7 μA. The Vos of Al oxide are considered to be useful for electronic memory storage." @default.
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- W1998346987 date "2012-08-01" @default.
- W1998346987 modified "2023-09-29" @default.
- W1998346987 title "Conduction band caused by oxygen vacancies in aluminum oxide for resistance random access memory" @default.
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- W1998346987 doi "https://doi.org/10.1063/1.4745048" @default.
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