Development of organic memory devices using self-assembled nanostructures of functional polymers

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K05220
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 35030:Organic functional materials-related
• Research Institution: National Institute for Materials Science
• Principal Investigator: AIMI Junko 国立研究開発法人物質・材料研究機構, 高分子・バイオ材料研究センター, 主任研究員 (80579821)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: Phthalocyanine / star-shaped polymer / supramolecular polymer / OFET memory

Outline of Final Research Achievements

The objective of this study was to develop a high-performance organic transistor (OFET) memory using a star-shaped polymer with a functional molecule core as a charge storage material. In particular, we have investigated ambipolar charge trapping OFET memory that can stably trap electrons and holes within the material.
We have synthesized a novel supramolecular miktoarm star copolymer that utilizes a coordination bond between a star-shaped polystyrene with a zinc phthalocyanine core and a polymer with a pyridyl end-group. The supramolecular miktoarm star-shaped copolymer showed unique phase-separated morphology in thin film, that was utilized in the OFET memory device. The fabricated OFET memory showed ambipolar charge-trapping capability via applying voltage as well as UV-light.

Free Research Field

高分子化学、超分子化学、有機メモリ

Academic Significance and Societal Importance of the Research Achievements

近年、ウェアラブルメモリやディスポーザブルメモリなどの、新たな社会ニーズに応えるメモリデバイスの需要が高まっている。そこで注目されているのが、有機材料を用いる「有機不揮発性メモリ」である。有機材料の持つ、軽量、低環境負荷、安価で簡便なプロセス、材料の多様性などの特徴を生かした素子開発が行われている。しかしながら、有機メモリに利用されるメモリ材料は、性能や耐久性に関して未だ課題が多い。本研究では、高性能有機メモリ材料開発を目的に、新たなポリマー材料の合成およびメモリメカニズムの解明に取り組み、課題解決に取り組んだ。