Charge Transport inside TiO 2 Memristors Prepared via FEBID.

We fabricated memristive devices using focused electron beam-induced deposition (FEBID) as a direct-writing technique employing a Pt/TiO 2 /Pt sandwich layer device configuration. Pinching in the measured current-voltage characteristics ( i-v ), the characteristic fingerprint of memristive behavior was clearly observed. The temperature dependence was measured for both high and low resistive states in the range from 290 K down to about 2 K, showing a stretched exponential behavior characteristic of Mott-type variable-range hopping. From this observation, a valence change mechanism of the charge transport inside the TiO 2 layer can be deduced.