Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 26, Issue 33, Pages 5979-5986Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201601143
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Funding
- National Natural Science Foundation of China [51520105007, 51375261]
- Natural Sciences and Engineering Research Council (NSERC) of Canada
- University of Waterloo
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Nanowire memristor devices that display multilevel memory effects are of great interest for high-density storage, however, numerous challenges remain in fabricating high-quality, stable memory units. A plasmonic-radiation-enhanced technique is introduced in this work for scalably forming nanowire multilevel memory units with superior properties. Femtosecond laser irradiation of gold-titanium dioxide nanowire-gold structures results in plasmonic-enhanced optical absorption in the TiO2 locally at the metal-oxide interface. This produces junctions with superior mechanical and electrical contact, and engineers a concentration of charged defects in the TiO2 near the interface, which enables stable multilevel memory behavior without the need for a traditional electroforming step. The memory units produced display eight-level current amplification under continuous forward voltage cycles, and can replicate complex multilevel memory sequences without interference between the different multilevel states.
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