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Asymmetric electron and hole transport in a high-mobility n-type conjugated polymer

Gert-Jan A. H. Wetzelaer, Martijn Kuik, Yoann Olivier, Vincent Lemaur, Jérôme Cornil, Simone Fabiano, Maria Antonietta Loi, and Paul W. M. Blom
Phys. Rev. B 86, 165203 – Published 18 October 2012
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Abstract

Electron- and hole-transport properties of the n-type copolymer poly{[N,N-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5-(2,2-dithiophene)} [P(NDI2OD-T2), PolyeraActivInk™ N2200] are investigated. Electron- and hole-only devices with Ohmic contacts are demonstrated, exhibiting trap-free space-charge-limited currents for both types of charge carriers. While hole and electron mobilities are frequently equal in organic semiconductors, room-temperature mobilities of 5 × 108 m2/V s for electrons and 3.4 × 1010 m2/V s for holes are determined, both showing universal Arrhenius temperature scaling. The origin of the large difference between electron and hole mobility is explained by quantum-chemical calculations, which reveal that the internal reorganization energy for electrons is smaller than for holes, while the transfer integral is larger. As a result, electron transport is intrinsically superior to hole transport under the same injection and extraction conditions.

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  • Received 4 August 2012

DOI:https://doi.org/10.1103/PhysRevB.86.165203

©2012 American Physical Society

Synopsis

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Asymmetry in Mobility

Published 18 October 2012

Experimental data in combination with calculations show why some organic semiconductors have intrinsically different mobilities for electrons and holes.

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Authors & Affiliations

Gert-Jan A. H. Wetzelaer1,2, Martijn Kuik1, Yoann Olivier3, Vincent Lemaur3, Jérôme Cornil3, Simone Fabiano1, Maria Antonietta Loi1, and Paul W. M. Blom1,4

  • 1Molecular Electronics, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
  • 2Dutch Polymer Institute, P.O. Box 902, 5600 AX Eindhoven, The Netherlands
  • 3Laboratory for Chemistry of Novel Materials, University of Mons, Place du Parc 20, 7000 Mons, Belgium
  • 4TNO/Holst Centre, High Tech Campus 31, 5605 AE Eindhoven, The Netherlands

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Issue

Vol. 86, Iss. 16 — 15 October 2012

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