Charge-transport model for conducting polymers
Charge-transport model for conducting polymers
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DOI：
10.1038/nmat4784
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发表时间：
2017-02-01
期刊：
影响因子：
41.2
通讯作者：
Snyder, G. Jeffrey
中科院分区：
文献类型：
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作者：
Kang, Stephen Dongmin;Snyder, G. Jeffrey
导电聚合物的技术重要性与日俱增，这使得对其电荷传输的基本了解对材料和工艺设计极其重要。人们已经提出了各种跳跃和迁移率边缘传输机制，但它们的实验验证仅限于劣导体。既然先进的有机和聚合物半导体已经表现出接近金属的高导电性，那么通过像半导体一样模拟具有输运边缘和输运参数的输运应该可以识别输运机制。在这里，我们分析电导率和塞贝克系数，并确定大多数聚合物(可能除了PEDOT：对甲苯磺酸盐)具有=3和热激活电导率，而S=1，巡回电导通常存在于晶体半导体和金属中。聚合物中不同的输运可能是由于导电有序区的电荷载流子通过导电不良的无序区的渗流造成的，这与结构研究的预期一致。
The growing technological importance of conducting polymers makes the fundamental understanding of their charge transport extremely important for materials and process design. Various hopping and mobility edge transport mechanisms have been proposed, but their experimental verification is limited to poor conductors. Now that advanced organic and polymer semiconductors have shown high conductivity approaching that of metals, the transport mechanism should be discernible by modelling the transport like a semiconductor with a transport edge and a transport parameters. Here we analyse the electrical conductivity and Seebeck coefficient together and determine that most polymers (except possibly PEDOT:tosylate) haves = 3 and thermally activated conductivity, whereas s = 1 and itinerant conductivity is typically found in crystalline semiconductors and metals. The different transport in polymers may result from the percolation of charge carriers from conducting ordered regions through poorly conducting disordered regions, consistent with what has been expected from structural studies.