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Phys. Rev. B 68, 081204 (2003) [4 pages]

Charge transport in doped organic semiconductors

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Yulong Shen1, Kenneth Diest1, Man Hoi Wong1, Bing R. Hsieh2, David H. Dunlap3, and George G. Malliaras1 *
1Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA
2Applied Chemistry, National Chiao Tung University, Hsinchu, Taiwan
3Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131, USA

Rapid Communication Received 19 May 2003; published 20 August 2003

We report an unusual transition in the conductivity of an organic semiconductor upon doping: For low doping levels, the conductivity of N,N,N′,N′-tetra-p-tolyl-4-4′-biphenyldiamine dispersed polycarbonate increases with doping in a nearly linear fashion, and shows an activation energy of 0.2 eV. At high doping levels, a superlinear increase of conductivity with doping is observed, and the activation energy decreases, reaching a low of 0.12 eV. This behavior is understood in terms of broadening of the transport manifold due to enhanced disorder coming from the dopants.


©2003 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v68/e081204
DOI: 10.1103/PhysRevB.68.081204
PACS: 72.80.Le, 85.60.Jb

* Author to whom correspondence should be addressed. Email address: george@ccmr.cornell.edu

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