Organic bistable memory devices based on MoO 3 nanoparticle embedded Alq 3 structures.

Organic bistable memory devices were fabricated by embedding a thin layer of molybdenum trioxide (MoO3 ) between two tris-(8-hydroxyquinoline)aluminum (Alq3 ) layers. The device exhibited excellent switching characteristics with an ON/OFF current ratio of 1.15 × 103 at a read voltage of 1 V. The device showed repeatable write-erase capability and good stability in both the conductance states. These conductance states are non-volatile in nature and can be obtained by applying appropriate voltage pulses. The effect of MoO3 layer thickness and its location in the Alq3 matrix on characteristics of the memory device was investigated. The field emission scanning electron microscopy (FE-SEM) images of the MoO3 layer revealed the presence of isolated nanoparticles. Based on the experimental results, a mechanism has been proposed for explaining the conductance switching of fabricated devices.