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Effect of the metallic contact on the electrical properties of organic semiconductor film

F. STANCULESCU1,* , A. STANCULESCU2, M. SOCOL2

Affiliation

  1. University of Bucharest, Faculty of Physics, 405 Atomistilor Street, P.O.Box MG-11, Magurele, Bucharest, 077125 Romania
  2. National Institute for Materials Physics, 105bis Atomistilor Street, P.O.Box MG 7, 077125 Magurele, Bucharest, Romania

Abstract

Sandwich type (MIS) heterostructures based on layers of organic semiconductors as meta-dinitrobenzene (m-DNB) and perylene or perylene derivative 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) have been prepared using alternative methods (rapid thermal directional solidification or two-steps, vacuum evaporation and deposition process) on different substrates (single crystal silicon wafer and textolite covered with copper film). Subsequently indium, gallium, aluminium of high purity (5N) and silver have been used for the preparations of the metallic contacts. This paper presents some investigations of the contact between different organic semiconductors and several metals: meta-dinitrobenzene/Cu, perylene/In, perylene/Al, perylene/Ga, perylene/Ag, PTCDA/Al, PTCDA/Ga, and PTCDA/Ag. The comparative study of the electrical conduction properties of these organic semiconductor/metal contacts has emphasised significant differences depending on the metal type, metal/organic semiconductor interface properties and quality of the contact, which is determined by the preparation method (pressing, melting, vacuum evaporation, painting) and selected contact configuration. The experimental data obtained using the 2 points contact geometry have evidenced linear or power I-V dependences of the investigated metallic contacts emphasising the importance of the space-charge phenomenon and defects on the charge carriers’ transport in these structures..

Keywords

Organic semiconductors, Metallic contacts, PTCDA, Perylene.

Submitted at: Nov. 14, 2006
Accepted at: May 15, 2007

Citation

F. STANCULESCU, A. STANCULESCU, M. SOCOL, Effect of the metallic contact on the electrical properties of organic semiconductor film, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 5, pp. 1352-1357 (2007)