Tunable Metallic-Like Transport in Polypyrrole

Xiaoling Zang, Yuqian Jiang, Yuqiao Chai, Fengwang Li, J. Ji, Mianqi Xue
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引用次数: 9

Abstract

Conjugated polymers (CPs), organic macromolecules with linear backbone of alternating C–C and C=C bonds, possess unique semiconductive properties, providing new opportunities for organic electronics, photonics, information, and energy devices. Seeking the metallic or metallic-like, even superconducting properties beyond semiconductivity in CPs is always one of the ultimate goals in polymer science and condensed matter. Only two metallic and semi-metallic transport cases – aniline-derived polyaniline (PANI) and thiophene-derived poly(3,4-ethylenedioxythiophene) (PEDOT) – have been reported since the development of CPs for four decades. Controllable synthesis is a key challenge in discovering more cases. Here we report the metallic-like transport behavior of another CP, polypyrrole (PPy). We observe that the transport behavior of PPy changes from semiconductor to insulator-metal transition, and gradually realizes metallic-like performance when the crystalline degree increases. Using a generalized Einstein relation model, we rationalized the mechanism behind the observation. The metallic-like transport in PPy demonstrates electron strong correlation and phonon-electron interaction in soft condensation matter, and may find practical applications of CPs in electrics and spintronics.
聚吡咯中可调谐的类金属输运
共轭聚合物(CPs)是一种具有C - C和C=C键交替线性主链的有机大分子,具有独特的半导体性质,为有机电子、光子学、信息和能源器件提供了新的机遇。在CPs中寻找半导体以外的金属或类金属,甚至超导性质一直是聚合物科学和凝聚态物质的终极目标之一。自CPs发展40年来,仅报道了两种金属和半金属运输案例-苯胺衍生聚苯胺(PANI)和噻吩衍生聚(3,4-乙烯二氧噻吩)(PEDOT)。可控合成是发现更多病例的关键挑战。本文报道了另一种高分子化合物聚吡咯(PPy)的类金属输运行为。我们观察到PPy的输运行为从半导体转变为绝缘体-金属转变,并随着结晶度的增加逐渐实现类金属性能。利用广义的爱因斯坦关系模型,我们理顺了观测背后的机制。PPy中的类金属输运证明了软凝聚物质中的电子强相关和声子电子相互作用,并可能在电学和自旋电子学中找到实际应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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CiteScore
7.40
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