Zinc Ion Triggered Controllable Binary/Ternary Memory Conversion Behaviors in Polyimides Containing Pendant Porphyrin Group

Compared with typical binary polymeric memory materials, functional polymers with ternary memory performance possess significant potential to achieve ultra‐high‐density data storage. The reported ternary memory polymers are normally driven by dual‐mechanism. However, the involved thermodynamically u...

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Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2020-12, Vol.16 (49), p.e2005659-n/a
Main Authors: Guo, Jiacong, Geng, Jianzhao, Tian, Guofeng, Ji, Deyang, Qi, Shengli, Wu, Dezhen
Format: Article
Language:English
Subjects:
Charge transfer
Data storage
Density
Ion charge
Logic circuits
Memory devices
Nanotechnology
Polyimide resins
polyimides
Polymers
porphyrin
Porphyrins
ternary memory
Trapping
Zinc
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Summary:Compared with typical binary polymeric memory materials, functional polymers with ternary memory performance possess significant potential to achieve ultra‐high‐density data storage. The reported ternary memory polymers are normally driven by dual‐mechanism. However, the involved thermodynamically unstable mechanisms (field‐induced conformation change or conductive filament formation/fracture) may result in the poor reliability of memory devices under high‐temperature working atmosphere. Another strategy to realize ternary memory is introducing charge trapping/de‐trapping mechanism by attaching charge trap atom/group at electron donor, which is proved not always effective. Moreover, the synergistic two mechanisms may have difficulty for clarifying the relationship between memory performance and chemical structures, which is the core issue of polymer memory materials. Besides, some multi‐level memory materials need the cooperative participation of artificially setting compliance current, which is the extension of typical binary memory and may cause a more complicated technique and logic circuit. Herein, based on charge‐transfer mechanism, a concise and effective strategy to realize ternary memory application is proposed. By inserting a Zn ion, the charge‐transfer process occurring in electron donors can lead to the novel electrical tri‐stability memory behaviors. This work can provide a novel idea for achieving reliable and intrinsic ternary high‐density data storage applications. For TPA‐based polyimides containing pendant porphyrin group, a simple insertion of Zn ion could activate the extra intramolecular charge‐transfer process in electron donor moiety. This process triggers the conversion from binary to ternary memory behavior, which provides great potential for high‐density data storage application with 3n memory mode.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.202005659