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, Paul W.M. Blom

Résultats de recherche: Contribution à un journal/une revueArticleRevue par des pairs

Résumé

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 × 10 -8 m2/Vs for electrons and 3.4 × 10 -10 m2/Vs 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.

langue originaleAnglais
Numéro d'article165203
journalPhysical Review. B, Condensed Matter and Materials Physics
Volume86
Numéro de publication16
Les DOIs
Etat de la publicationPublié - 18 oct. 2012
Modification externeOui

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