Organic bistable memory devices utilizing PMMA polymer matrix-based ZnOC60 core-shell QDs nanocomposites

Abstract

This study explores the development of organic bistable memory devices (OBMDs) leveraging ZnO-fullerene (C₆₀) core-shell QDs embedded within a poly(methyl methacrylate) (PMMA) polymer matrix. Employing a spin-coating methodology, ZnO QDs were encapsulated with fullerene C₆₀, a molecule renowned for its high electron affinity, to establish a robust core-shell configuration. This design significantly enhanced quantum confinement and provided efficient charge trapping capabilities. Structural analyses using transmission electron microscopy (TEM) confirmed the uniform dispersion and precise formation of ZnOC₆₀ QDs, exhibiting an average particle size of approximately 10 nm within the polymer matrix. The electrical performance of Al/ZnOC₆₀ QD-embedded PMMA/ITO devices was evaluated at 300 K, revealing clear bistable characteristics. The devices achieved a high ON/OFF current ratio of 7.46 × 10³, demonstrated exceptional cycling endurance exceeding 1.5 × 10⁴ cycles, and exhibited long-term retention surpassing 1.2 × 105 s. Detailed analysis of current-voltage (I-V) data highlighted Fowler-Nordheim (F-N) tunneling as a key mechanism facilitating efficient memory operation. These findings underscore the potential of ZnOC₆₀ core-shell QDs as a transformative material system for advanced non-volatile memory technologies. This work provides a foundation for further exploration into scalable and energy-efficient memory devices suitable for next-generation electronics and optoelectronics.