Volpi Martina, Jouclas Rémy, Liu Jie, Liu Guangfeng, Catalano Luca, McIntosh Nemo, Bardini Marco, Gatsios Christos, Modesti Federico, Turetta Nicholas, Beljonne David, Cornil Jérôme, Kennedy Alan R, Koch Norbert, Erk Peter, Samorì Paolo, Schweicher Guillaume, Geerts Yves H
Laboratoire de Chimie des Polymères, Faculté des Sciences, Université Libre de Bruxelles (ULB), Boulevard du Triomphe, CP 206/01, Bruxelles, 1050, Belgium.
Laboratory for Chemistry of Novel Materials, Center for Research in Molecular Electronics and Photonics, University of Mons, Place du Parc 23, Mons, B-7000, Belgium.
Adv Sci (Weinh). 2023 Sep;10(26):e2301914. doi: 10.1002/advs.202301914. Epub 2023 Jul 9.
Chiral molecules are known to behave as spin filters due to the chiral induced spin selectivity (CISS) effect. Chirality can be implemented in molecular semiconductors in order to study the role of the CISS effect in charge transport and to find new materials for spintronic applications. In this study, the design and synthesis of a new class of enantiopure chiral organic semiconductors based on the well-known dinaphtho[2,3-b:2,3-f]thieno[3,2-b]thiophene (DNTT) core functionalized with chiral alkyl side chains is presented. When introduced in an organic field-effect transistor (OFET) with magnetic contacts, the two enantiomers, (R)-DNTT and (S)-DNTT, show an opposite behavior with respect to the relative direction of the magnetization of the contacts, oriented by an external magnetic field. Each enantiomer displays an unexpectedly high magnetoresistance over one preferred orientation of the spin current injected from the magnetic contacts. The result is the first reported OFET in which the current can be switched on and off upon inversion of the direction of the applied external magnetic field. This work contributes to the general understanding of the CISS effect and opens new avenues for the introduction of organic materials in spintronic devices.
由于手性诱导自旋选择性（CISS）效应，手性分子被认为可作为自旋过滤器。可以在分子半导体中引入手性，以研究CISS效应在电荷传输中的作用，并寻找用于自旋电子学应用的新材料。在本研究中，展示了一类基于用手性烷基侧链功能化的著名的二萘并[2,3-b:2,3-f]噻吩并[3,2-b]噻吩（DNTT）核的新型对映体纯手性有机半导体的设计与合成。当将两种对映体（R）-DNTT和（S）-DNTT引入具有磁性接触的有机场效应晶体管（OFET）中时，它们相对于由外部磁场定向的接触磁化的相对方向表现出相反的行为。每种对映体在从磁性接触注入的自旋电流的一个优选取向上均显示出出乎意料的高磁阻。该结果是首次报道的OFET，其中电流可在施加的外部磁场方向反转时开启和关闭。这项工作有助于对CISS效应的总体理解，并为在自旋电子器件中引入有机材料开辟了新途径。
