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Ambipolar charge-trapping in self-assembled nanostructures of supramolecular miktoarm star-shaped copolymer with a zinc phthalocyanine core
Nonvolatile organic field-effect transistor (OFET) memories have attracted considerable attention owing to their potential applications in flexible and wearable electronic devices. The novel design of a charge-trapping material based on supramolecular miktoarm star copolymers (µ-stars) consisting of star-shaped polystyrene with a zinc phthalocyanine core (ZnPcPS4) and pyridyl end-functionalized polymer (py-polymer) has been studied to explore the influence of self-assembled morphology on the final device performances. Supramolecular µ-stars containing the ZnPc core showed distinctive phase-separated nanostructures in the films that were different from typical polymer blends. The OFET memory devices embedded with supramolecular µ-stars exhibited ambipolar charge-trapping behavior with photoresponsive characteristics, resulting in a wide memory window (47 V) with a high on/off current ratio (>107) for a long period of time (>104 s). Furthermore, the charge-trapping properties of the polymer memory layer were studied using Kelvin probe force microscopy (KPFM), revealing enhanced charge-trapping capabilities attributed to nanoscale phase separation in the supramolecular µ-star. This study provides the design and concept of charge-trapping materials for next-generation high-performance OFET memory devices.
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- 21/05/2024
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