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Ultra‐Low Power Multilevel Switching with Enhanced Uniformity in Forming Free TiO 2−x ‐Based RRAM with Embedded Pt Nanocrystals
Author(s) -
Tsigkourakos Menelaos,
Bousoulas Panagiotis,
Aslanidis Vaggelis,
Skotadis Evangelos,
Tsoukalas Dimitris
Publication year - 2017
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201700570
Subject(s) - resistive random access memory , materials science , nanocrystal , optoelectronics , electric field , protein filament , nanotechnology , electrode , physics , composite material , quantum mechanics
Accurate control over the various resistance states is highly desired in order to attain reliable multilevel memory performance. However, due to the inherent random nature of oxygen vacancy creation, serious variability issues may arise. In this work, we demonstrate promising multilevel capability with ultra‐low power consumption in the range of nW, using sub‐200 nA operating current in a 45 nm TiO 2−x ‐based resistive random access memory (RRAM) with embedded small (≈5 nm in diameter) Pt nanocrystals (NCs). As the resistance values present a strong dependence on both the oxygen vacancy density and the diameter of the conducting filament (CF), hence the degree of the variability (or uniformity) can be improved by controlling one of these two parameters. It is shown here that the presence of NCs allows for the generation of multiple and dense CFs due to the concentrated electric field around the NCs which, in turn, enhance the consecutive cycling (temporal) uniformity, even at very low operating power conditions.