Adjusting the spacers between the electron-acceptor and the elector-donor is important to design organic ternary memory material but rarely reported. In this paper, two small molecules, ZIPGA and ZIPCAD with benzene r...Adjusting the spacers between the electron-acceptor and the elector-donor is important to design organic ternary memory material but rarely reported. In this paper, two small molecules, ZIPGA and ZIPCAD with benzene ring or triphenylamine as the spacers, were designed and synthesized to fabricate memory devices. The A1/ZIPGA/indium-tin oxide （ITO） device showed ternary characteristics, whereas A1/ZIPCAD/ITO had no obvious memory characteristics. Density functional theory calculation, X-ray diffraction （XRD） and atomic force microscopy （AFM） were employed to interpret the different memory properties. ZIPGA thin film has the closer intermolecular packing and flatter surface morphology than ZIPCAD film, which was favorable to the electron migration. This work demonstrates the importance of spacers and reveals that triphenylamine may be not a good spacer in design of new memory material.展开更多
基金supported by the National Natural Science Foundation of China (21176164, 21336005)the Chinese-Singapore Joint Project (2012DFG41900)the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
文摘Adjusting the spacers between the electron-acceptor and the elector-donor is important to design organic ternary memory material but rarely reported. In this paper, two small molecules, ZIPGA and ZIPCAD with benzene ring or triphenylamine as the spacers, were designed and synthesized to fabricate memory devices. The A1/ZIPGA/indium-tin oxide （ITO） device showed ternary characteristics, whereas A1/ZIPCAD/ITO had no obvious memory characteristics. Density functional theory calculation, X-ray diffraction （XRD） and atomic force microscopy （AFM） were employed to interpret the different memory properties. ZIPGA thin film has the closer intermolecular packing and flatter surface morphology than ZIPCAD film, which was favorable to the electron migration. This work demonstrates the importance of spacers and reveals that triphenylamine may be not a good spacer in design of new memory material.
