Issue 7, 2023

Switching the memory behaviour from binary to ternary by triggering S62− relaxation in polysulfide-bearing zinc–organic complex molecular memories

Abstract

The use of crystalline metal–organic complexes with definite structures as multilevel memories can enable explicit structure–property correlations, which is significant for designing the next generation of memories. Here, four Zn–polysulfide complexes with different degrees of conjugation have been fabricated as memory devices. ZnS6(L)2-based memories (L = pyridine and 3-methylpyridine) can exhibit only bipolar binary memory performances, but ZnS6(L)-based memories (L = 2,2′-bipyridine and 1,10-phenanthroline) illustrate non-volatile ternary memory performances with high ON2/ON1/OFF ratios (104.22/102.27/1 and 104.85/102.58/1) and ternary yields (74% and 78%). Their ON1 states stem from the packing adjustments of organic ligands upon the injection of carriers, and the ON2 states are a result of the ring-to-chain relaxation of S62− anions. The lower conjugated degrees in ZnS6(L)2 result in less compact packing; consequently, the adjacent S62− rings are too long to trigger the S62− relaxation. The deep structure–property correlation in this work provides a new strategy for implementing multilevel memory by triggering polysulfide relaxation based on the conjugated degree regulation of organic ligands.

Graphical abstract: Switching the memory behaviour from binary to ternary by triggering S62− relaxation in polysulfide-bearing zinc–organic complex molecular memories

Supplementary files

Article information

Article type
Communication
Submitted
09 Jan 2023
Accepted
02 Mar 2023
First published
03 Mar 2023

Mater. Horiz., 2023,10, 2535-2541

Switching the memory behaviour from binary to ternary by triggering S62− relaxation in polysulfide-bearing zinc–organic complex molecular memories

P. Zhou, X. Lin, M. Y. Chee, W. S. Lew, T. Zeng, H. Li, X. Chen, Z. Chen and H. Zheng, Mater. Horiz., 2023, 10, 2535 DOI: 10.1039/D3MH00037K

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