Spin injection and spin dynamics in organic spintronics interfaces

我们的实验计划的目标是解决有关自旋弛豫、自旋相关的输运、自旋注入以及有机半导体(OSC)界面的磁现象等基本问题。我们选择研究具有代表性的OSC材料，这些材料在电荷传输和/或光电子学应用中具有被证明的优异性能。我们将主要关注无机固体(铁磁体、半金属铁磁体，GaAs)和有机材料(AlQ、6T、Rubrene、DPEP和CuPc)之间的自旋注入。在这些研究中，我们将使用以下技术：1)自旋和时间分辨的双光子光电子能谱；2)时间分辨的磁光克尔效应；3)紫外光和X射线光电子能谱，以及逆光电子能谱；4)自旋分辨的紫外光电子能谱。自旋和时间分辨表征技术的引入以及材料和表面/界面分析的系统方法将为OSC中的自旋动力学和注入提供重要信息。这两个团队都有关于拟议测量以及大多数测量仪器的先前工作和经验的直接联系。这些保证了拟议工作的及时进展和方案的成功。此外，合作还为学生和博士后提供了参与国际研究体验的机会。

The objective of our experimental program is to resolve fundamental questions regarding spin relaxation, spin-dependent transport, spin injection, and magnetic phenomena at interfaces with organic semiconductors (OSC). We choose to study representative OSC materials that have proven superior properties in charge transport and/or optoelectronics applications. We will focus mainly on spin injection across the interface between an inorganic solid (ferromagnet, halfmetallic ferromagnet, GaAs) and organic materials (Alq, 6T, rubrene, DPEP, and CuPc). For these studies, we will employ the following techniques: 1) spin- and time-resolved 2-photon photoemission spectroscopy; 2) time-resolved magneto-optical Kerr effect; 3) ultraviolet and xray photoemission spectroscopy, and inverse photoemission spectroscopy; 4) spin-resolved ultraviolet photoemission spectroscopy. The introduction of spin- and time-resolved characterization techniques and the systematic approach of materials and surface/interface analysis will provide vital information on spin dynamics and injection in OSC. Both teams have directly related previous work and experience on the proposed measurements, as well as most of the instruments for the measurements. Those assure timely progress in the proposed work and the success of the program. In addition, the collaboration offers students and postdocs the opportunity to participate in an international research experience.