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Role of Hydroxyl on Conductivity Switching of Poly(ethylene oxide)/TiO2 Electrical Bistable Devices

Conductivity switching in a semiconductor nanoparticle/polymer composite electrical bistable device is typically associated with the electron trapping between the semiconductor trap center and the polymer matrix. However, the switch‐on mechanism is still not clear, and even in the same metal oxide (MO) nanoparticle/polymer system, two different models are applied to explain the conductivity switching mechanisms, including Fowler–Nordheim (F–N) tunneling current and trapped charge‐limit‐current (TCLC). Therefore, the analysis of the conductivity‐switching mechanism in MO/polymer composite devices is crucial to facilitate technology development. Herein, poly(ethylene oxide) (PEO) films are deposited on top of the various TiO2 films, and the two different electrical bistabilities are observed. The corresponding conductivity‐switching mechanisms are found to be significantly related to the different TiO2 surface traps. The results demonstrate that the F–N tunneling current dominates in the devices where a large number of hydroxyl groups are present in TiO2, whereas, after removing the hydroxyl groups from the device, the switching‐on current is dominated by the TCLC mechanism.