Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/8903
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
Series/Report no.: G01R, C07B 55/00
Abstract: <smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place"> 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 <i style="">p</i><sub>0</sub>, hole mobility μ<sub>p</sub> , total trap concentration <i style="">N</i><sub>t</sub> 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 <img src='/image/spc_char/alpha.gif' border=0><sup>2</sup> versus <i style="">h</i>n graph. The optical constants n and k have been found. The real and imaginary parts of the optical dielectric constant <img src='/image/spc_char/italics_e.gif' border=0><sub>1</sub> and <img src='/image/spc_char/italics_e.gif' border=0><sub>2</sub> have been calculated. </smarttagtype>
Description: 964-971
URI: http://hdl.handle.net/123456789/8903
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.43(12) [December 2005]

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