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IJPAP Vol.43(12) [December 2005] >


Title: Electrical and optical properties of vacuum deposited ZnPc and CoPc thin films and application of variable range hopping model
Authors: Rajesh, K R
Menon, C S
Keywords: Organic compounds
Thin films
Electrical properties
Optical properties
Issue Date: Dec-2005
Publisher: CSIR
IPC CodeG01R, C07B 55/00
Abstract:  Sandwich and planar structures have been fabricated using zinc phthalocyanine (ZnPc) and cobalt phthalocyanine as active layers and gold (Au) as electrodes by thermal evaporation method. The permittivity e is determined from the dependence of capacitance on film thickness. J-V characteristics of Au/ZnPc/Au and Au/CoPc/Au structures at room temperature have been performed. Thermally generated hole concentration p0, hole mobility μp , total trap concentration Nt and depth of the trap level have been estimated. The activation energies of the films have been determined from the Arrhenious plots of ln s versus 1000/T. Employing the variable range hopping model, hopping conduction parameters have been calculated. The absorption and reflectance spectra of ZnPc and CoPc thin films deposited at room temperature have been recorded in the spectral range 300-900 nm. The optical band gaps of the films have been determined from the 2 versus hn graph. The optical constants n and k have been found. The real and imaginary parts of the optical dielectric constant 1 and 2 have been calculated.
Page(s): 964-971
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.43(12) [December 2005]

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