Electro-Acoustic Effect in Organic Structure Based on Star-Shaped Carbazole Derivatives

• Published in: Molecular Crystals and Liquid Crystals Vol. 589; no. 1; pp. 67 - 73
• Main Authors: Hotra, Z., Volyniuk, D., Cherpak, V., Stakhira, P., Grygorchak, I., Grazulevicius, J. V., Michaleviciute, A., Tomkeviciene, A., Barylo, G., Kus, N., Hladun, M.
• Format: Journal Article
• Language: English
• Published: Philadelphia Taylor & Francis Group 22-01-2014; Taylor & Francis Ltd
• Subjects: Aluminum; Crystals; Derivatives; Electric currents; Electric potential; Electromechanical transducers; electrostriction effect; inductive response; Molecular structure; Molecules; Oscillations; Semiconductors; Spatial distribution; Spectrum analysis; Voltage
• ISSN: 1542-1406; 1563-5287; 1527-1943
• DOI: 10.1080/15421406.2013.871918

We have found that the structures based on ITO/tri(9-hexylcarbazol-3-yl)amine/Ca/Al fabricated by means of vacuum deposition generate acoustic oscillations when pulse voltage is applied. Impedance spectroscopy study indicates the presence of significant inductive response, which is the result of significant energy barriers at the semiconductor-metal interface. We assume that a very heterogeneous spatial distribution of the electric field at the organic/metal interface and the noncoplanarity of the molecules cause the electrostriction effect in the structures.