Organic molecular films on gold versus conducting polymer: Influence of injection barrier height and morphology on current-voltage characteristics

被引：91
作者：
Koch, N
Elschner, A
Schwartz, J
Kahn, A [1 ]
机构：
[1] Princeton Univ, Dept Elect Engn, Princeton, NJ 08544 USA
[2] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA
[3] Bayer AG Uerdingen, HC Starck GmbH, D-47829 Krefeld, Germany
来源：
APPLIED PHYSICS LETTERS | 2003年 / 82卷 / 14期
关键词：
D O I：
10.1063/1.1565506
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The current-voltage characteristics I(V) of model organic devices are studied under ultra-high-vacuum conditions. Active materials are N,N'-bis-(1-naphthyl)-N,N'-diphen-yl1-1,1-biphenyl1-4,4'-diamine (alpha-NPD) and pentacene, electrode materials are polycrystalline Au and the conductive polymer poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) (PEDOT/PSS). Despite a similar work function of electrode material surfaces (similar to5 eV), hole injection from PEDOT/PSS is significantly more efficient than from Au, due to a smaller hole injection barrier. Hole injection characteristics from Au electrodes for devices made from alpha-NPD are independent of deposition sequence and substrate used. Pentacene devices exhibit serious asymmetries in that respect. These are caused by a strong dependence of morphology and preferred molecular orientation on the substrate for the crystalline material. (C) 2003 American Institute of Physics.
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页码：2281 / 2283
页数：3
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