Title
Asymmetric electron and hole transport in a high-mobility n-type conjugated polymer
Author
Wetzelaer, G.-J.A.H.
Kuik, M.
Olivier, Y.
Lemaur, V.
Cornil, J.
Fabiano, S.
Loi, M.A.
Blom, P.W.M.
Publication year
2012
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 × 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. © 2012 American Physical Society.
Subject
Mechatronics, Mechanics & Materials
HOL - Holst
TS - Technical Sciences
High Tech Systems & Materials
Materials
Industrial Innovation
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http://resolver.tudelft.nl/uuid:882362d0-75da-4cff-81d0-86704cffb5e2
TNO identifier
465839
ISSN
1098-0121
Source
Physical Review B - Condensed Matter and Materials Physics, 86 (16)
Article number
165203
Document type
article