Anisotropic hopping conduction in spin-coated PEDOT:PSS thin films
Anisotropic hopping conduction in spin-coated PEDOT:PSS thin films
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DOI：
10.1103/physrevb.76.085208
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发表时间：
2007-08-01
影响因子：
3.7
通讯作者：
Janssen, R. A. J.
中科院分区：
文献类型：
--
作者：
Nardes, A. M.;Kemerink, M.;Janssen, R. A. J.
研究了自旋包覆聚（3,4-乙烯二氧噻吩）：聚苯乙烯磺酸盐（PEDOT:PSS）中电荷输运随温度和电场的变化规律。发现其大小和输运机制都具有很强的各向异性。这种惊人的行为可以用一种形态模型来定量解释，在这种形态模型中，扁平的、富含pedot的准金属颗粒被组织在水平层中，这些层被连续绝缘的PSS薄片隔开。在该模型中，面内电导率由亚纳米PSS屏障分隔的类似25 nm大小的富pedot颗粒之间的三维可变范围跳变来描述，而面外电导率由间隔更宽的分子位点之间的最近邻跳变来描述。这些长度尺度支持以前报道的扫描探针测量。
The charge transport in spin-coated poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) has been investigated as a function of temperature and electric field. Both the magnitude and the transport mechanism are found to be strongly anisotropic. This striking behavior is quantitatively explained in terms of a morphological model in which flattened, quasimetallic PEDOT-rich grains are organized in horizontal layers that are separated by continuous insulating PSS lamellas. In this model, the in-plane conductivity is described by three-dimensional variable range hopping between similar to 25 nm sized PEDOT-rich particles separated by subnanometer PSS barriers, while the out-of-plane conductivity is described by nearest-neighbor hopping between more widely spaced molecular sites. These length scales are supported by previously reported scanning probe measurements.