Journal Article10.1002/ADFM.201001254
Interface-Engineered Amorphous TiO2-Based Resistive Memory Devices
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TL;DR: In this paper, the stable bipolar resistive switching in metal/a-TiO2/metal RRAM devices is attributed to both interface domains: the top interface domain with mobile oxygen ions and the bottom interface domain for its protection against an electrical breakdown.
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Abstract: Crossbar-type bipolar resistive memory devices based on low-temperature amorphous TiO2 (a-TiO2) thin films are very promising devices for flexible nonvolatile memory applications. However, stable bipolar resistive switching from amorphous TiO2 thin films has only been achieved for Al metal electrodes that can have severe problems like electromigration and breakdown in real applications and can be a limiting factor for novel applications like transparent electronics. Here, amorphous TiO2-based resistive random access memory devices are presented that universally work for any configuration of metal electrodes via engineering the top and bottom interface domains. Both by inserting an ultrathin metal layer in the top interface region and by incorporating a thin blocking layer in the bottom interface, more enhanced resistance switching and superior endurance performance can be realized. Using high-resolution transmission electron microscopy, point energy dispersive spectroscopy, and energy-filtering transmission electron microscopy, it is demonstrated that the stable bipolar resistive switching in metal/a-TiO2/metal RRAM devices is attributed to both interface domains: the top interface domain with mobile oxygen ions and the bottom interface domain for its protection against an electrical breakdown.
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Resistance random access memory
TL;DR: In this article, the authors classify resistive random access memory (RRAM) devices into four categories according to different resistive switching mechanisms, from which the four elements are (1) anion-type RRAM: redox reaction and migration of oxygen ions, (2) cation-type RDAM: the stretch of C C C bond lengths due to oxygen and hydrogen dual ions, and (3) oxide-based electrode: oxygen accumulation in oxide based electrode.
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