DC conduction processes and electrical parameters of the organic semiconducting zinc phthalocyanine, ZnPc, thin films

SALEH, A. M., HASSAN, A. K. and GOULD, R. D. (2003). DC conduction processes and electrical parameters of the organic semiconducting zinc phthalocyanine, ZnPc, thin films. Journal of physics and chemistry of solids, 64 (8), 1297-1303.

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Link to published version:: 10.1016/s0022-3697(03)00135-5

Abstract

Electronic conduction in thermally evaporated thin films of organic semiconductor zinc phthalocyanine (ZnPc) has been investigated in a broad temperature range using gold Ohmic contacts. Electronic conduction by charge carrier hopping was dominated at low temperatures and for all applied voltages. At higher temperatures and at voltages just below 2 V conduction was found to obey Ohm's law, while at higher voltages space-charge-limited conduction (SCLC) was the dominated mechanism, which was controlled by hole-trapping states distributed exponentially within the band gap. In freshly prepared samples adsorbed oxygen was responsible for lower hole mobility and higher charge carrier concentrations. Prolonged heating of ZnPc films at 425 K resulted in lower defect state density, and thus reduced trap concentration and higher charge carrier mobility. (C) 2003 Elsevier Science Ltd. All rights reserved.

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: 10.1016/s0022-3697(03)00135-5
Depositing User: Helen Garner
Date Deposited: 19 May 2010 14:03
Last Modified: 19 May 2010 14:03
URI: http://shura.shu.ac.uk/id/eprint/2002

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