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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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 - Does NOT include content added after October 2018:	Materials and Engineering Research Institute > Advanced Coatings and Composites Research Centre > Electronic Materials and Sensors Research Group
Identification Number:	https://doi.org/10.1049/ip-smt:19990492
Page Range:	205-209
Depositing User:	Helen Garner
Date Deposited:	19 May 2010 12:59
Last Modified:	18 Mar 2021 21:15
URI:	https://shura.shu.ac.uk/id/eprint/2001

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