Abstract

This chapter is arranged as a bottom-up journey through the most important noise type in emerging resistive random access memory (RRAM) devices: random telegraph noise (RTN). In the last 10 years, RRAMs have gained enormous popularity and attracted the attention of many researchers and industries throughout the world. Studying noise, and particularly RTN, in such devices is of primary importance because it can contribute essential information about the physics of the devices and clarify the role and the atomistic properties of the defects. Starting from the basic mathematical formulation of RTN, we will analyze its statistical properties, and devise suitable methods to measure and analyze it. These methods will then be employed to characterize RTN, focusing on the representative case of the HfO2-based RRAM. Detailed results will be provided, which will clarify the physical mechanisms behind RTN and give hints about the atomistic properties of the defects involved. In addition, a physics-based compact model of RTN in RRAM devices will be developed, showing some of the opportunities that it can offer.

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