Design and Synthesis of Functionalized Triarylamines with Donor Pi Acceptor Architecture A Promising Material for Non Volatile Organic Memory Devices

Abstract

o develop non-volatile memory devices, a variety of organic materials, including small newlineorganic molecules, polymers, organic/inorganic hybrids, and their composites, have been newlineexplored to date owing to their opportunity for cost reduction, adaptable molecular designs, newlinesuperior producibility, and potential use in next-generation memory technology. Over the past newlinedecade, organic-based resistive memory systems have rapidly grown and drawn much interest newlineand intense investigation to meet the constantly increasing demand for ultrahigh-density data newlinestorage in flexible memory devices. TAAs are reported for OFET, OLED, OSC, and sensors newlineowing to their electron-donating nature, emissive property, and and#960;-and#960; stacking interaction in the newlinethin-film self-assembly. The main advantage is its unique structure and easy molecular newlinearchitecture modification via a simple synthetic approach. Even though the initial studies reported moderate memory storage ability in TAA-based memory devices, changing the architecture with different terminal substituents and extended conjugation resulted in better newlinecharge transportation and improved performance. Because of all these superior characteristics newlineunambiguously, the functionalized triarylamines are great applicants for high-density data newlinestorage technology. In this work, we have designed and synthesized triarylamine-based organic small molecules with D-and#960;-A systems for non-volatile memory devices with different memory newlineproperties. The functionalized triarylamines were synthesized by varying the acceptors and newlineterminal units with an acetylene bridge. The D-and#960;-A systems were synthesized via Debus newlineRadziszewski reaction and palladium-catalyzed Suzuki and Sonogashira cross-coupling newlinereactions. The photophysical and electrochemical studies showed good intermolecular charge newlinetransfer between the donor and acceptor units and an irreversible anodic peak (1.36-1.01 V) newlinewith a lower band gap in the range of 2.72-3.05 eV