Solution-processable triarylamine-based high-performance polymers for resistive switching memory devices

Abstract

This review summarizes the most widely used mechanisms in high-performance polymeric resistive memory devices, such as charge transfer, space charge trapping and filament conduction. In addition, recent studies of functional high-performance polymers for memory device applications are reviewed, compared and differentiated based on the mechanisms and structural design methods used. By carefully designing the polymeric structure based on these systematically investigated switching mechanisms, almost all types of current memory characteristics can be reproduced, and these memory properties show extremely high endurance during long-term operation, which makes polyimides very suitable materials for memory applications. INTRODUCTION High-performance polymersToday, life without polymers is unimaginable. Polymers have become the major synthetic materials of the 21st century. High-performance polymers (HPPs) are particularly desirable. The synthesis and development of HPPs over the past 30 years have drawn the attention of many polymer scientists and investigators. These polymers generally possess excellent physical deformation resistance and chemical deterioration resistance at high temperatures over long periods of time. The quest for HPPs began in the late 1950s to meet the demands of the military, aerospace, machine-building and electronics industries, among many other industrial applications.Hill and Walker 1 first noted that the incorporation of aromatic segments into a polymer generally results in a notable increase in its thermal stability. For this reason, much of the research work has been directed toward aromatic compositions. Hence, HPPs usually tend to contain large numbers of aromatic units in their structures. Several of these aromatic HPPs have been used for commercial applications, such as aromatic polyamides, polyimides, polyesters, polysulfones, polytriphenylamine and heterocyclic polymers (Scheme 1). Aromatic polyamides (aramids) and polyimides, such as DuPont's Kevlar fiber and Kapton film, respectively, have been well known for a long time and constantly attract more interest than other HPPs for their useful properties, such as excellent thermal and oxidative stabilities, high mechanical strengths, low flammabilities and good chemical and radiation resistances. [2][3][4][5][6][7][8][9][10][11][12][13] However, the rigidity of the backbone and strong hydrogen bonding of these HPPs result in high melting or glass-transition

Unravelling the Pathway Complexity in Conformationally Flexible N‐Centered Triarylamine Trisamides

“…Triarylamine-based molecules are widely studied in organic electronics fort heir versatile properties. [1][2][3][4][5][6][7][8][9][10][11][12] For attainingg ood conductive properties,i ti sc rucial to achieve aw ell-organized microstructure in which defects and localized electronic states are minimized. [13,14] Recent research demonstrates that the ability to exert full control during the formation of the desired nanostructures enhances the performance of functional materials.…”

Mussel‐Inspired Polydopamine Coating for Flexible Ternary Resistive Memory

“…In the previous studies, many mechanisms were proposed for the resistance switch in memory devices,s uch as phase transition mechanism, [19] charge trapping mechanism, [20] charge transfer [21] and the formationo ff ilament mechanism, [22] electron tunneling mechanism, ferroelectric effect and metal filament mechanism, [23] magnetoelectric couplingm echanism and others. [24] The charge trapping-induced conductive filament are most likely responsible to our ternary memory device of polydopamine because of the following evidence. We first investigated the relationship between the top electrode's (Al) areas with current level of the three resistance states based on as tatistic on as ample size of 50 by varying the electrode area from 0.0078 mm 2 ,0 .031 mm 2 to 0.071 mm 2 (Figure 7a).…”

Synthesis, Electrochemical Reduction and Radical Anions of 2‐[Bis(4‐amino(nitro)phenyl)aminomethyl]‐9H‐thioxanthene‐9‐one Derivatives

“…[8][9][10][11] Pendant groups should meet the requirements of thermal stability and high electron affinity or low ionization potential, because energies of their boundary molecular orbit- als determine the corresponding redox potentials. [13] The reversibility towards electron transfer is a desirable requirement for pendant groups because they should not undergo chemical decomposition initiated by electron addition or ionization. Elaboration of new pendant groups with low redox potentials is an important task because too high ON and OFF switching voltage determined by, for example, carbazole and triphenylamine pendant groups (> 2 V) [8,12] results in high OFF currents.…”