Wang Jiawei, Niu Jiebin, Shao Bin, Yang Guanhua, Lu Congyan, Li Mengmeng, Zhou Zheng, Chuai Xichen, Chen Jiezhi, Lu Nianduan, Huang Bing, Wang Yeliang, Li Ling, Liu Ming
Key Laboratory of Microelectronic Devices & Integrated Technology, Institute of Microelectronics, Chinese Academy of Sciences, Beijing, 100029, China.
Shenzhen JL Computational Science and Applied Research Institute, Shenzhen, 518110, China.
Nat Commun. 2021 Jan 4;12(1):58. doi: 10.1038/s41467-020-20238-5.
Organic conjugated polymers demonstrate great potential in transistors, solar cells and light-emitting diodes, whose performances are fundamentally governed by charge transport. However, the morphology-property relationships and the underpinning charge transport mechanisms remain unclear. Particularly, whether the nonlinear charge transport in conducting polymers is appropriately formulated within non-Fermi liquids is not clear. In this work, via varying crystalline degrees of samples, we carry out systematic investigations on the charge transport nonlinearity in conducting polymers. Possible charge carriers' dimensionality is discussed when varying the molecular chain's crystalline orders. A heterogeneous-resistive-network (HRN) model is proposed based on the tied-link between Fermi liquids (FL) and Luttinger liquids (LL), related to the high-ordered crystalline zones and weak-coupled amorphous regions, respectively. The HRN model is supported by precise electrical and microstructural characterizations, together with theoretic evaluations, which well describes the nonlinear transport behaviors and provides new insights into the microstructure-correlated charge transport in organic solids.
有机共轭聚合物在晶体管、太阳能电池和发光二极管中展现出巨大潜力，其性能从根本上受电荷传输支配。然而，形态-性能关系以及潜在的电荷传输机制仍不清楚。特别是，导电聚合物中的非线性电荷传输是否能在非费米液体中得到恰当描述尚不明晰。在这项工作中，我们通过改变样品的结晶度，对导电聚合物中的电荷传输非线性进行了系统研究。在改变分子链的结晶顺序时，讨论了可能的电荷载流子维度。基于费米液体（FL）和卢廷格液体（LL）之间的关联（分别与高阶结晶区和弱耦合非晶区相关），提出了一种异质电阻网络（HRN）模型。HRN模型得到了精确的电学和微观结构表征以及理论评估的支持，很好地描述了非线性传输行为，并为有机固体中与微观结构相关的电荷传输提供了新的见解。
