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首页> 外文会议>Conference on Noise as a Tool for Studying Materials Jun 2-4, 2003 Santa Fe, New Mexico, USA >Electric conduction mechanism in conjugated polymers studied using Flicker noise spectroscopy
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Electric conduction mechanism in conjugated polymers studied using Flicker noise spectroscopy

机译：闪烁噪声光谱研究共轭聚合物中的导电机理

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摘要

We have performed detailed analysis of the fluctuations of the electrical current in electrochemically deposited conductive polymers (CP) using as example polyaniline (PANI) and poly(3-methyl thiophene) (PMT). These heterogeneous and disordered materials cannot be analyzed in terms of classical conduction mechanisms (like Schottky or Poole-Frenkel emission). Instead the electrical transport in CPs is to be considered as a stochastic process with large component of noise. We have been able to distinguish several modes of the conduction process in conducting polymers applying Flicker Noise Spectroscopy. Thus we have established that the transport of charge carriers in highly doped CPs is much less correlated than in non-doped ones at the same electric field strength. While applied electric field increases, correlations become lower in a sequence of elementary events contributing to the conductivity of CP. Apparently, the change in the correlation length corresponds to changing mechanism of the electrical conduction. The lower correlation in highly doped sample can be attributed to various factors including change in CP conformation, enhancement in inter-chain charge transfer and generation of polaron lattice.
机译：我们以聚苯胺（PANI）和聚（3-甲基噻吩）（PMT）为例，详细分析了电化学沉积的导电聚合物（CP）中的电流波动。这些异质无序的材料无法通过经典的传导机制（如肖特基或普尔-弗伦克尔发射）进行分析。相反，CP中的电传输应被视为具有大量噪声的随机过程。我们已经能够应用闪变噪声光谱学来区分导电聚合物中的几种导电过程模式。因此，我们已经确定，在相同的电场强度下，高掺杂CPs中的电荷载流子的相关性要比未掺杂CPs中的低得多。当施加的电场增加时，相关性在有助于CP导电性的一系列基本事件中变低。显然，相关长度的变化对应于导电的变化机理。高掺杂样品中较低的相关性可归因于各种因素，包括CP构象的变化，链间电荷转移的增强和极化子晶格的产生。

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