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Mesoscopic 2D Charge Transport in Commonplace PEDOT:PSS Films
Advanced Electronic Materials ( IF 6.2 ) Pub Date : 2018-01-03 , DOI: 10.1002/aelm.201700490
Yuta Honma 1 , Keisuke Itoh 1 , Hiroyasu Masunaga 2 , Akihiko Fujiwara 3 , Terukazu Nishizaki 4 , Satoshi Iguchi 1 , Takahiko Sasaki 1
Affiliation  

The correlation between the transport properties and structural degrees of freedom of conducting polymers is a central concern in both practical applications and scientific research. In this study, the existence of mesoscopic 2D coherent charge transport in poly(3,4‐ethylenedioxythiophene):poly‐(styrenesulfonate) (PEDOT:PSS) film is demonstrated by performing structural investigations and high‐field magnetoconductance (MC) measurements in magnetic fields of up to 15 T. The researchers have succeeded in observing marked positive MCs reflecting 2D electronic states in a conventional drop‐cast film. This low‐dimensional feature is surprising, since PEDOT:PSS—a mixture of two different polymers—seems to be significantly different from crystalline 2D materials from the viewpoint of structural inhomogeneity, especially in popular drop‐cast thick films. The results of the structural experiments suggest that such 2D transport originates from the nanometer‐scale self‐assembled laminated structure, which is composed of PEDOT nanocrystals wrapped by insulating sheets consisting of amorphous PSSs. These results indicate that charge transport in the PEDOT:PSS film can be divided into two regimes: mesoscopic 2D coherent tunneling and macroscopic 3D hopping among 2D states. These findings elucidate the hieratical nature of charge transport in the PEDOT:PSS film, which can provide new insight into a recent engineering concern, i.e., the anisotropic conductance.

中文翻译:

普通PEDOT:PSS膜中的介观2D电荷传输

导电聚合物的传输性能和结构自由度之间的相关性是实际应用和科学研究中的主要关注点。在这项研究中,通过在磁性中进行结构研究和高场磁导(MC)测量,证明了聚(3,4-乙撑二氧噻吩):聚(苯乙烯磺酸盐)(PEDOT:PSS)膜存在介观二维相干电荷传输。研究人员已经成功地观察到了常规的压铸胶卷中反映二维电子状态的显着正MC,它们反映了二维电子状态。这种低维特征令人惊讶,因为从结构不均匀性的角度来看,PEDOT:PSS(两种不同聚合物的混合物)似乎与结晶的2D材料显着不同,尤其是在流行的压铸厚膜中。结构实验的结果表明,这种2D传输起源于纳米级自组装叠层结构,该结构由PEDOT纳米晶体包裹,该PEDOT纳米晶体包裹着由非晶态PSS组成的绝缘片。这些结果表明,PEDOT:PSS膜中的电荷传输可以分为两种状态:介观2D相干隧穿和2D状态之间的宏观3D跳跃。这些发现阐明了PEDOT:PSS膜中电荷传输的层级性质,可以为最近的工程问题(即各向异性电导)提供新的见解。这些结果表明,PEDOT:PSS膜中的电荷传输可分为两种状态:介观2D相干隧穿和2D状态之间的宏观3D跳跃。这些发现阐明了PEDOT:PSS膜中电荷传输的层级性质,可以为最近的工程问题(即各向异性电导)提供新的见解。这些结果表明,PEDOT:PSS膜中的电荷传输可分为两种状态:介观2D相干隧穿和2D状态之间的宏观3D跳跃。这些发现阐明了PEDOT:PSS膜中电荷传输的层级性质,可以为最近的工程问题(即各向异性电导)提供新的见解。
更新日期:2018-01-03
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