Implementation of Thermal-Triggered Binary-Ternary Switchable Memory Performance in Zn/polysulfide/organic...

Area of Science:

• Materials Science
• Chemistry
• Nanotechnology

Background:

• Polysulfide-based multilevel memory devices rely on sulfide (S^2-) relaxation for function.
• The influence of crystal packing and organic ligand side groups on S^2- relaxation remains unclear, hindering device design.

Purpose of the Study:

• To investigate how crystal packing and organic ligand structures affect S^2- relaxation in Zn/polysulfide/organic complexes.
• To develop novel memory devices with tunable memory performance.

Main Methods:

• Synthesis of four Zn/polysulfide/organic complexes with varying structures and packing modes.
• Fabrication of memory devices using these complexes (FTO/complex/Ag).
• Characterization of memory performance (binary, ternary, thermally triggered switching) and structural analysis.

Main Results:

• Ionic and neutral complexes (1, 2, 4) exhibited binary memory due to condensed ligand packing.
• Complex 3, ZnS6(Ombipy), demonstrated unique thermally triggered reversible binary-ternary switching.
• The methyl group in complex 3 inhibited S^2- relaxation at room temperature but allowed it at 120 °C, confirmed by structural changes.

Conclusions:

• Crystal packing and ligand structure significantly influence S^2- relaxation and memory behavior in polysulfide devices.
• The design of stimulus-responsive memory devices can be guided by understanding these structure-property relationships.
• These findings offer potential for applications in specialized industries requiring robust memory solutions.