Title :
Thiophene-based material for non volatile organic memory devices: A combined experimental and theoretical study
Author :
Canesi, E.V. ; Fazzi, D. ; Bertarelli, C. ; Castiglioni, C. ; Natali, D. ; Zerbi, G.
Author_Institution :
Dipt. di Chimica, Politec. di Milano, Milan, Italy
Abstract :
A diphenyl bithiophene derivative (DPBT), which shows electrical bistability when tested in a two-terminal memory cell, has been extensively characterized with the aim to highlight the molecular root of the bistable behavior. A vibrational spectroscopic characterization has been carried out, supported by first-principles theoretical studies and X-ray analysis. Spectroscopic markers suitable to distinguish the different stable conformers of the molecule have been predicted and detected. These evidences have been further confirmed by the characterization of molecular species related to DPBT. The result obtained can be applied to determine the molecular isomers present in the organic active layer of the memory cell and opens the way to the identification of the molecular species involved in such electrical bistability.
Keywords :
Raman spectra; X-ray diffraction; circuit bistability; isomerism; molecular electronics; organic compounds; random-access storage; X-ray analysis; diphenyl bithiophene derivative; electrical bistability; first-principles calculation; molecular isomers; nonvolatile organic memory devices; organic active layer; spectroscopic markers; stable conformers; two-terminal memory cell; vibrational spectroscopy; Etching; Gallium nitride; Indium tin oxide; Light emitting diodes; Optical buffering; Optical device fabrication; Optical surface waves; Organic materials; Surface texture; Temperature; Bithiophene; Raman spectroscopy; isomerization; organic memory device;
Conference_Titel :
Nanotechnology, 2009. IEEE-NANO 2009. 9th IEEE Conference on
Conference_Location :
Genoa
Print_ISBN :
978-1-4244-4832-6
Electronic_ISBN :
1944-9399
