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Proceedings Paper

Electrical and structural properties of LB multilayers of (methylacylamino) azobenzenes
Author(s): Sabarna Mukhopadhyay; Ilir Rama; Marisela Velez; Sebastian Vieira; Gita Matisova; Inta Muzikante; Egils Fonavs
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Paper Abstract

The present publication is devoted to the studies of the structure of the Langmuir-Blodget films of (methylacylamino)azobenzene derivatives and their electrical properties. Structural studies of monolayer have been carried out by atom force microscopy. The molecules are closely packed in a hexagonal crystalline array. UV irradiation causes a rearrangement of the molecules and a significant structural modification in the monolayer is observed in the frontier region between two crystalline domains of different orientations. The anisotropy of dc conductivity sigma is observed in multilayer assemblies. A low dc conductivity in the bulk sample of the order of sigma(perpendicular) approximately equal to 10-1010-13 S/cm is obtained. In the case of in-plane conductivity the value of conductivity is of the order of sigma(parallel) approximately equals 10-8- 10-10 S/cm. The several sets of hole trapping states are situated at energy depth of Et1 equals 0.55 plus or minus 0.03 eV and Et2 equals 0.48 plus or minus 0.03 eV with the value of the total density of given set of traps of the order of 1012 cm-3. The frequency dependence of capacitance and conductance is nonlinear, with capacitance values decreasing exponentially with higher frequencies while the conductance increases gradually. The behavior is one typical for low mobility materials and the conduction mechanism can be explained in terms of hopping conduction between localized states. The linear dependence of dc in-plane conductivity on relative humidity was observed.

Paper Details

Date Published: 6 February 1997
PDF: 6 pages
Proc. SPIE 2968, Optical Organic and Semiconductor Inorganic Materials, (6 February 1997); doi: 10.1117/12.266860
Show Author Affiliations
Sabarna Mukhopadhyay, South Bank Univ. (United Kingdom)
Ilir Rama, South Bank Univ. (United Kingdom)
Marisela Velez, Univ. Autonoma (Spain)
Sebastian Vieira, Univ. Autonoma (Spain)
Gita Matisova, Latvian Institute of Organic Synthesis (Latvia)
Inta Muzikante, Institute of Physical Energetics (Latvia)
Egils Fonavs, Institute of Physical Energetics (Latvia)

Published in SPIE Proceedings Vol. 2968:
Optical Organic and Semiconductor Inorganic Materials
Edgar A. Silinsh; Arthur Medvids; Andrejs R. Lusis; Andris O. Ozols, Editor(s)

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