Crystalline Organic Molecular Thin Film with Electrical Switching Property: Scanning Probe Microscopy and Optical Spectroscopy Study

Autor:	Yanlin Song, Z. M. Wang and, and J. C. Li, C. H. Yan, Ke-Zhi Wang, Z. Q. Xue, and Lei Jiang, D. B. Zhu
Rok vydání:	2004
Předmět:	Diffraction Scanning probe microscopy Materials science Transmission electron microscopy Materials Chemistry Analytical chemistry Crystal structure Substrate (electronics) Physical and Theoretical Chemistry Thin film Spectroscopy Surfaces Coatings and Films Monoclinic crystal system
Zdroj:	The Journal of Physical Chemistry B. 108:19348-19353
ISSN:	1520-5207 1520-6106
Popis:	We report on the growth and characterization of crystalline 1,1-dicyano-2,2-(4-dimethylaminophenyl)ethylene (DDME) thin film with electrical switching property. X-ray diffraction analysis indicates that bulk single-crystal DDME belongs to monoclinic, space group P21, and Z = 2 structure. Optical spectroscopy shows that the film chemical structure is consistent with that of the powder material, suggesting that DDME material is very stable during the vacuum thermal deposition process. Scanning probe microscopy and transmission electron microscopy observations reveal that the as-deposited film has extended crystal structure and smooth surface morphology in micrometer scale. Parallel molecular stacking structure is repeatedly observed in the film surfaces with the axis of the molecular stack parallel to the substrate. The ac crystal plane is found to be one of the most stable surfaces of the DDME film in ambient conditions. Nanometer scale data storage is realized on the film by applying pulse voltage between...
Databáze:	OpenAIRE
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