Synthesis Of Bridge Contains Nitrogen Of Push-pull Electronic Groups Of Conjugated Organic Small Molecules For Electronic Memory Devices

With the rapid development of information technology, the requirements of growth ofhigh capacity of information storage has a huge conflict between the relative laginformation technology. It is difficult to further break though the capacity of informationstorage due to the storage density of magnetic and optical storage based on inorganicmaterials are close to a physical limits. So scientists are working to find new materials forinformation storage. Organic memory materials can be potential applications in the futurememory storage due to their good processability, low-cost, low power and structuralflexibility. Herein, we synthesized a series of small molecules based on bridge containsnitrogen and study the memory performance by adjusting the bridge between a donor andan acceptor and the amount of nitrogen atoms of bridge.1. Effect of a π-spacer between a donor and an acceptor on small molecule-baseddata-storage device performance: We synthesized a small molecule CAPyNA withelectron donor (carbazole group) and acceptor (naphthalimide moiety) linked by a pyridineacetylene π-spacer and SNACA with hydrazone was synthesized and characterized toinvestigate the π-spacer effect on memory device performance. The theoretical simulationresults showed that the electron density of HOMO and LUMO have observably change.This change will lead to two molecules present different storage types. This fact is verifiedby experimental results. It shows that through the theoretical calculation can predict theperformance of the material. The above observations indicated that rationally-tailoring theπ-spacer between electron-donor and acceptor units in the molecular scaffold could open anew design pathway for achieving high-performing data-storage devices with versatilememory types.2. Effect of nitrogen content of a π-spacer between a donor and an acceptor onsmall molecule-based data-storage device performance: We synthesized threemolecules CAPhNI, CAPyNI and CAPmNI, the nitrogen of bridge was0,1, and2. This paper studies the properties of molecular film-forming and memory storage by changingthe nitrogen content of bridge between a donor and an acceptor. XRD measurementsresults show that a highly ordered CAPyNI and CAPmNI thin film was formed thanCAPhNI and this structure is beneficial to improve the carrier transport throughout the film.AFM results show that with the increase of nitrogen atoms, better film-forming propertyand the surface roughness reduced in turn. I–V results show that CAPhNI exhibits binaryWORM memory behavior, CAPyNI and CAPmNI exhibit ternary WORM memorybehavior, and the threshold voltage of ON1of CAPyNI was lower than CAPmNI. Theabove results show that it is significant to changing the nitrogen content of bridge betweena donor and an acceptor to obtain high-performing data-storage devices.3. Effect of pyridine π-spacer on small molecule-based data-storage deviceperformance: We synthesized CAPyNa, CAPyNI and CAPyNA, all of three moleculecontains pyridine, we studied the effect of pyridine on electronic memory characteristics.The weak electron-withdrawing pyridine group of three molecule do not as electron trap, itcan not participate in storage. Results show that it is good help to design contains multipleelectron-withdrawing groups affect the performance of electric storage provides.