Institute Néel, CNRS, Grenoble, France.
Cavendish Laboratory, University of Cambridge, Cambridge, UK.
Nat Mater. 2020 May;19(5):491-502. doi: 10.1038/s41563-020-0647-2. Epub 2020 Apr 15.
Conjugated polymers and molecular semiconductors are emerging as a viable semiconductor technology in industries such as displays, electronics, renewable energy, sensing and healthcare. A key enabling factor has been significant scientific progress in improving their charge transport properties and carrier mobilities, which has been made possible by a better understanding of the molecular structure-property relationships and the underpinning charge transport physics. Here we aim to present a coherent review of how we understand charge transport in these high-mobility van der Waals bonded semiconductors. Specific questions of interest include estimates for intrinsic limits to the carrier mobilities that might ultimately be achievable; a discussion of the coupling between charge and structural dynamics; the importance of molecular conformations and mesoscale structural features; how the transport physics of conjugated polymers and small molecule semiconductors are related; and how the incorporation of counterions in doped films-as used, for example, in bioelectronics and thermoelectric devices-affects the electronic structure and charge transport properties.
共轭聚合物和分子半导体作为一种可行的半导体技术，正在显示、电子、可再生能源、传感和医疗保健等行业中崭露头角。一个关键的促成因素是在提高其电荷输运性能和载流子迁移率方面取得了重大的科学进展，这得益于对分子结构-性能关系和基础电荷输运物理的更好理解。在这里，我们旨在对如何理解这些高迁移率范德华键半导体中的电荷输运进行全面的综述。感兴趣的具体问题包括对最终可能实现的载流子迁移率的内在限制的估计；讨论电荷和结构动力学之间的耦合；分子构象和介观结构特征的重要性；共轭聚合物和小分子半导体的输运物理之间的关系；以及掺杂薄膜中反离子的掺入（例如，在生物电子学和热电设备中使用）如何影响电子结构和电荷输运性质。
