Wittmann Angela, Schweicher Guillaume, Broch Katharina, Novak Jiri, Lami Vincent, Cornil David, McNellis Erik R, Zadvorna Olga, Venkateshvaran Deepak, Takimiya Kazuo, Geerts Yves H, Cornil Jérôme, Vaynzof Yana, Sinova Jairo, Watanabe Shun, Sirringhaus Henning
Optoelectronics Group, Cavendish Laboratory, University of Cambridge, J. J. Thompson Avenue, Cambridge CB3 0HE, United Kingdom.
Institut für Angewandte Physik, Universität Tübingen, Aufder Morgenstelle 10, 72076 Tübingen, Germany.
Phys Rev Lett. 2020 Jan 17;124(2):027204. doi: 10.1103/PhysRevLett.124.027204.
There is a growing interest in utilizing the distinctive material properties of organic semiconductors for spintronic applications. Here, we explore the injection of pure spin current from Permalloy into a small molecule system based on dinaphtho[2,3-b:2,3-f]thieno[3,2-b]thiophene (DNTT) at ferromagnetic resonance. The unique tunability of organic materials by molecular design allows us to study the impact of interfacial properties on the spin injection efficiency systematically. We show that both the spin injection efficiency at the interface and the spin diffusion length can be tuned sensitively by the interfacial molecular structure and side chain substitution of the molecule.
利用有机半导体独特的材料特性用于自旋电子学应用的兴趣与日俱增。在此，我们探索在铁磁共振条件下从坡莫合金向基于二萘并[2,3 - b:2,3 - f]噻吩并[3,2 - b]噻吩（DNTT）的小分子体系注入纯自旋电流。通过分子设计实现的有机材料独特的可调性使我们能够系统地研究界面性质对自旋注入效率的影响。我们表明，界面处的自旋注入效率和自旋扩散长度均可通过分子的界面分子结构和侧链取代进行灵敏调节。
