Thermally Stable Ternary Data-Storage Device Based on Twisted Anthraquinone Molecular Design

Abstract

Three donor−acceptor and twisted anthraquinone azo molecules were synthesized, and the effects of conjugated backbones length, alkyl chains length, and the thermal annealing temperature on the memory characteristics were explored. The device based on Azo-02, which has longer conjugated backbone and alkyl chains, exhibited stable nonvolatile ternary memory behavior as the thermal annealing temperature increased, with basically the same switching threshold voltages and current ratios being ∼1:10 3.43 :10 5.50 . For the "counterpart" molecules (Azo-01 and Azo-03) film, defects appeared or disordered, crystal packing formed as the thermal annealing temperature increased, and the corresponding devices exhibited no obvious conductance switching behaviors. The mechanism related to electrical switching properties and WORM (write-once-read-manytimes) behaviors were elucidated through molecular simulation. The results demonstrated that the long-term thermally stable high-density data-storage devices can be fabricated by adjusting the structures of twisted molecules.

Ternary Flexible Electro‐resistive Memory Device based on Small Molecules

“…[36,56] Furthermore, the introduction of appropriate alkyl chains in the molecular backbone can lead to ordered stacking of conjugated parts through intramolecular interdigitation. [57] Thus,w ed esigned as mall molecule, 1,5-bis((E)-(4-(dibutylamino)phenyl)-diazenyl)anthracene-9,10-dione (BAzoAN), throughm ounting conjugated backbone with alkyl chains.…”

Two quinoxaline derivatives designed from isomer chemistry for nonvolatile ternary memory device applications

“…The higher-quality film morphology of QU-2 was also owing to the better conjugation of the substituent of 5,8-sites. Additionally, the compact film can effectively prevent the formation of conductive filaments due to aluminum infiltration [34].…”

“…Later, the study of new ultra-high density storage materials then emerged as a possible solution to the challenge of vast information produced every day. To obtain superior materials and devices, many aspects had been studied such as adjusting the length of conjugated system [24] and alkyl chain [33,34], tuning the molecular planarity [35], optimizing the molecular or electrode deposition rate [36]. However, in most of these studies, the composition of the molecules (functional groups or main framework) had been changed, which would plainly cause differences in the performance of the molecules.…”

Improving Memory Performances by Adjusting the Symmetry and Polarity of O‐Fluoroazobenzene‐Based Molecules

“…[18,[22][23][24] Song and co-workers designed and synthesized as eries of azo small molecules, successfully realizing reversible nanometer-scale data storage by scanningt unneling microscopy (STM) on thin films. [27][28][29][30][31] However,t he thermal stability of azobenzene derivatives is generally lower than 280 8C, which may hinder their application in organic electronics. [27][28][29][30][31] However,t he thermal stability of azobenzene derivatives is generally lower than 280 8C, which may hinder their application in organic electronics.…”