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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.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Organic Field Effect Transistor Memory, Star-shaped Polymer, Supramolecular Polymer, Phthalocyanine, Ambipolar Charge Trapping, Kelvin Probe Force Microscopy

Date published: 2024-05-21

Publisher: Royal Society of Chemistry

Journal:

• Journal of Materials Chemistry C (ISSN: 20507534)

Funding:

• JSPS JP21K05220 (高分子の自己組織化を利用する分子メモリ素子開発)
• JSPS JP21F21052 (光で制御する有機多値論理演算デバイスの開発)
• JSPS JP23H00269 (有機ヘテロ界面で制御する特異な電気伝導と革新的演算素子への応用)
• JSPS JP23H04874 (メゾヒエラルキーの映像分子科学)
• Grant-in- Aid from Izumi Science and Technology Foundation 2022-J-034 (光応答機能を持つフレキシブル有機メモリ開発)

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1039/D4TC01265H

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Updated at: 2024-06-25 12:30:21 +0900

Published on MDR: 2024-06-25 12:30:21 +0900