Electrical bistabilities and memory mechanisms of organic bistable devices based on colloidal ZnO quantum dot-polymethylmethacrylate polymer nanocomposites

Abstract

Transmission electron microscopy images showed that colloidal ZnO quantum dots (QDs) were distributed around the surface of a polymethylmethacrylate (PMMA) polymer. Current-voltage (I-V) measurements on the Al/colloidal ZnO QDs blended with PMMA polymer layer/indium-tin-oxide/glass devices at 300 K showed a current bistability. The maximum ON/OFF ratio of the current bistability for the organic bistable devices (OBDs) was as large as 5×104, and the cycling endurance time of the ON/OFF switching for the OBDs was above 105. The memory mechanisms of the fabricated OBDs are described on the basis of the I-V results.