Electrical and structural properties of LB multilayers of (methylacylamino) azobenzenes

Sabarna Mukhopadhyay; Ilir Rama; Marisela Velez; Sebastian Vieira; Gita Matisova; Inta Muzikante; Egils Fonavs

doi:10.1117/12.266860

6 February 1997 Electrical and structural properties of LB multilayers of (methylacylamino) azobenzenes

Sabarna Mukhopadhyay, Ilir Rama, Marisela Velez, Sebastian Vieira, Gita Matisova, Inta Muzikante, Egils Fonavs

Proceedings Volume 2968, Optical Organic and Semiconductor Inorganic Materials; (1997) https://doi.org/10.1117/12.266860
Event: International Conference on Advanced Optical Materials and Devices, 1996, Riga, Latvia

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 E_t¹ equals 0.55 plus or minus 0.03 eV and E_t² 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.

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Sabarna Mukhopadhyay, Ilir Rama, Marisela Velez, Sebastian Vieira, Gita Matisova, Inta Muzikante, and Egils Fonavs "Electrical and structural properties of LB multilayers of (methylacylamino) azobenzenes", Proc. SPIE 2968, Optical Organic and Semiconductor Inorganic Materials, (6 February 1997); https://doi.org/10.1117/12.266860

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