Conduction in partially monoclinic films of lead phthalocyanine

RAY, A. K., TRACEY, S. M. and HASSAN, A. K. (1999). Conduction in partially monoclinic films of lead phthalocyanine. Iee Proceedings-Science Measurement and Technology, 146 (4), 205-209.

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Link to published version:: 10.1049/ip-smt:19990492

Abstract

The X-ray diffraction pattern of vacuum sublimed thin films of lead phthalocyanine on glass substrates shows a partially monoclinic structure. The DC conduction is extrinsic since the activation energy is much smaller than the energy bandgap. AC conductivity sigma(ac) follows a power law dependence on frequency (f) for T less than or equal to 230K and 20Hz less than or equal to f less than or equal to 320kHz range, and this behaviour is believed to be due to correlated hopping of charge carriers over a reduced intercluster potential barrier of 0.49eV and a minimum distance of 6.7nm. Above 230K, the dielectric polarisation occurs due to structural inhomogeneities with a distribution of relaxation times. The conduction becomes independent of temperature at 1 MHz.

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Thin Films Research Centre > Electronic Materials and Sensors Research Group
Identification Number: 10.1049/ip-smt:19990492
Depositing User: Helen Garner
Date Deposited: 19 May 2010 13:59
Last Modified: 19 May 2010 13:59
URI: http://shura.shu.ac.uk/id/eprint/2001

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