Electrical conductivity and magnetism at organic single crystal charge transfer interfaces

有机单晶电荷转移界面的导电性和磁性

• 批准号: 326645892
• 负责人: Dr. Yulia Krupskaya, Ph.D.
• 金额: --
• 依托单位: Institut für Festkörperforschung
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/326645892?language=en
• 关键词: Electrical; conductivity; magnetism; organic; single

Direct contact of two initially insulating organic single crystals can cause significant interfacial electrical conductivity and in some cases can even lead to metallic behaviour. It is known that this enhanced conductivity is mediated by the charge transferred from one material to the other; however there still remains an important scientific question: what are the exact physical mechanisms responsible for the charge transfer and the interfacial conductivity in organic materials? Based on this question, we set the first scientific aim of this project as investigation of the charge transfer and conductivity at organic single crystal interfaces in order to understand the physical mechanisms. On the other hand, our recent study has shown that the charge transfer responsible for the enhanced electrical conductivity at F16CoPc/Rubrene interface involves Co centres of F16CoPc molecules that leads to a change in Co spin. Such an involvement of metal ions into the charge transfer opens a possibility to simultaneously control magnetism and charge transport at organic interfaces. Motivated by this result, we set the second scientific aim of this project as investigation of organic charge transfer interfaces involving magnetic metal-organic molecules in order to understand the interfacial physical processes and to find a connection between charge transport and magnetism. To achieve these aims, we plan to grow high quality organic single crystals, build organic single crystal charge transfer interfaces, as well as interfaces involving magnetic metal-organic molecules and study their charge transport and magnetic properties.

两个初始绝缘的有机单晶的直接接触可导致显著的界面导电性，并且在某些情况下甚至可导致金属行为。众所周知，这种增强的导电性是由从一种材料转移到另一种材料的电荷介导的;然而，仍然存在一个重要的科学问题：有机材料中电荷转移和界面导电性的确切物理机制是什么？基于这个问题，我们将本项目的第一个科学目标定为研究有机单晶界面的电荷转移和导电性，以了解其物理机制。另一方面，我们最近的研究表明，负责在F16 CoPc/Rubrene界面的增强的导电性的电荷转移涉及F16 CoPc分子的Co中心，导致Co自旋的变化。这种金属离子参与电荷转移的可能性，同时控制磁性和电荷传输在有机界面。受此结果的启发，我们将该项目的第二个科学目标设定为研究涉及磁性金属-有机分子的有机电荷转移界面，以了解界面物理过程并找到电荷传输与磁性之间的联系。为了实现这些目标，我们计划生长高质量的有机单晶，构建有机单晶电荷转移界面，以及涉及磁性金属-有机分子的界面，并研究其电荷传输和磁性。