Thiadizoloquinoxaline-Based N-Heteroacenes as Active Elements for High-Density Data-Storage Device

Area of Science:

• Organic electronics
• Materials science
• N-heteroacene chemistry

Background:

• Organic multilevel resistive memory devices are crucial for next-generation data storage.
• Donor-acceptor (D-A) type N-heteroacenes offer tunable electronic properties for memory applications.

Purpose of the Study:

• To develop and investigate a novel thiadiazoloquinoxaline (TQ)-based N-heteroacene for organic multilevel resistive memory.
• To understand the structure-property relationships governing memory behavior in these materials.

Main Methods:

• Synthesis of a novel D-A type N-heteroacene, Py-1-TQ, incorporating a TQ unit.
• Fabrication and characterization of organic memory devices using Py-1-TQ.
• Analysis of electrical characteristics, including current ratios and memory effects.

Main Results:

• Py-1-TQ demonstrated nonvolatile write-once-read-many-times (WORM)-type ternary memory effects.
• Achieved high ON2/ON1/OFF current ratios (10^5.8:10^3.4:1), surpassing binary memory counterparts.
• Attributed ternary behavior to stepwise D-A charge-transfer processes driven by tunable electron-withdrawing abilities.

Conclusions:

• TQ-based N-heteroacenes are promising candidates for ultrahigh-density data-storage devices.
• Rational design of D-A interactions is key to achieving advanced memory functionalities.
• Py-1-TQ represents a significant advancement in organic memory materials.