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

被引:69
作者
Wetzelaer, Gert-Jan A. H. [1 ,2 ]
Kuik, Martijn [1 ]
Olivier, Yoann [3 ]
Lemaur, Vincent [3 ]
Cornil, Jerome [3 ]
Fabiano, Simone [1 ]
Loi, Maria Antonietta [1 ]
Blom, Paul W. M. [1 ,4 ]
机构
[1] Univ Groningen, Zernike Inst Adv Mat, NL-9747 AG Groningen, Netherlands
[2] Dutch Polymer Inst, NL-5600 AX Eindhoven, Netherlands
[3] Univ Mons, Lab Chem Novel Mat, B-7000 Mons, Belgium
[4] TNO Holst Ctr, NL-5605 AE Eindhoven, Netherlands
来源
PHYSICAL REVIEW B | 2012年 / 86卷 / 16期
关键词
FIELD-EFFECT TRANSISTORS; LIGHT-EMITTING DEVICES; CHARGE-TRANSPORT; ORGANIC SEMICONDUCTORS; THEORETICAL CHARACTERIZATION; POLARIZATION ENERGIES; CESIUM-CARBONATE; METAL-OXIDES; INJECTION; PARAMETERS;
D O I
10.1103/PhysRevB.86.165203
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
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 (TM) 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 x 10(-8) m(2)/Vs for electrons and 3.4 x 10(-10) m(2)/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.
引用
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页数:9
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