Spin Polarization Spectroscopy in Organic Semiconductors

有机半导体中的自旋偏振光谱

• 批准号: 1701427
• 负责人: Zeev Valy Vardeny
• 金额: $ 59.5万
• 依托单位: University of Utah
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-09-01 至 2021-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1701427&HistoricalAwards=false
• 关键词: Spin; Polarization; Spectroscopy; Organic; Semiconductors

Nontechnical description: As the miniaturization of electronic circuits approaches its limitation, there is a need to find alternative ways to generate, manipulate, transfer and detect information while reducing the energy needed for such operations. One approach to achieve this is to use the magnetic behavior of electrons, otherwise known as spin. Using the spin in order to implement such a new type of information processing is called "spintronics". The research in this project focuses on studying physical mechanisms that allow for spintronics in carbon-based, so-called organic semiconductors. These studies include in particular the control and manipulation, the transport and the very sensitive detection of magnetic phenomena in thin plastic films. Spintronics devices based on such novel materials are engineered, fabricated and tested using electrical, magnetic and optical measurements. In addition, the integration of the large arsenal of experimental efforts serves to efficiently educate graduate and undergraduate students participating in these interdisciplinary research projects. Separately, the research team is also reaching out to pre-college students in order to inform them on career opportunities and the technological potential of the Physical and Natural Sciences. Technical description: The goal of this project is to improve the understanding of electron spin polarization effects in organic semiconductors with tunable strength of the spin-orbit coupling. Specifically, the project aims to develop an understanding of the physical nature of spin transport in this materials class. The research is focused on spin polarized charge carrier ensembles using two spin-polarization techniques: (i) spin-pumping by resonantly generated spin-waves in ferromagnetic substrates, which is detected by the inverse spin-Hall effect; and (ii) thermally induced equilibrium spin-polarization obtained from high magnetic fields at cryogenic temperatures, which is detected by field-induced circular polarization emission. Spintronics devices such as spin-valves, spin-diodes, and spin organic light emitting diodes are engineered, fabricated and tested using electrical, magnetic and optical means. This project integrates the University of Utah's large arsenal of experimental capabilities, including polymer and small molecule deposition, magneto-transport, electrically-detected ferromagnetic resonance, magnon-related spin-pumping, modeling as well as device fabrication, processing and testing. Together, these unfold the broad impact of an entirely new class of electronics for educating a cadre of graduate and undergraduate students who are involved in the execution of this project, and the outreach that is made to local High School and Middle School communities.

非技术性描述：随着电子电路的小型化接近其极限，需要找到替代方式来生成、操纵、传输和检测信息，同时减少这些操作所需的能量。实现这一点的一种方法是使用电子的磁性行为，也称为自旋。利用自旋来实现这种新型的信息处理被称为“自旋电子学”。该项目的研究重点是研究碳基所谓的有机半导体中允许自旋电子学的物理机制。这些研究包括特别是控制和操纵，运输和非常敏感的检测薄塑料薄膜中的磁现象。基于这种新型材料的自旋电子器件的设计，制造和测试使用电，磁和光学测量。此外，实验工作的大型军火库的整合有助于有效地教育参与这些跨学科研究项目的研究生和本科生。另外，研究小组还接触到大学预科学生，以告知他们职业机会和物理和自然科学的技术潜力。技术说明：本计画的目标是利用可调的自旋轨道耦合强度来增进对有机半导体中电子自旋极化效应的了解。具体来说，该项目旨在发展在这类材料自旋输运的物理性质的理解。研究的重点是自旋极化的电荷载流子系综使用两种自旋极化技术：（i）自旋泵的共振产生的自旋波在铁磁衬底，这是由逆自旋霍尔效应检测;和（ii）热诱导平衡自旋极化从高磁场在低温下，这是由场致圆极化发射检测。自旋电子器件，如自旋阀，自旋二极管和自旋有机发光二极管的设计，制造和测试使用电，磁和光学手段。该项目整合了犹他州大学的大型实验能力，包括聚合物和小分子沉积，磁输运，电检测铁磁共振，磁振子相关的自旋泵，建模以及设备制造，加工和测试。总之，这些展现了一个全新的电子类的广泛影响，用于教育参与该项目执行的研究生和本科生干部，以及对当地高中和中学社区的推广。

项目成果

Sign reversal of magnetoresistance and inverse spin Hall effect in doped conducting polymers

• DOI: 10.1088/1361-648x/aae86f
• 发表时间: 2018-11
• 期刊: Journal of Physics: Condensed Matter
• 作者: D. Sun;Y. Zhai;K. V. van Schooten;Chuang Zhang;M. Kavand;H. Malissa;M. Groesbeck;R. Menon;C. Boehme;Z. Vardeny

Long-lived-correlated triplet-pair state in an imide substituted poly-thienylene vinylene-based π-conjugated polymer

酰亚胺取代的聚噻吩亚乙烯基α-共轭聚合物中的长寿命相关三重态对态

• DOI: 10.1117/1.jpe.8.032217
• 发表时间: 2018
• 期刊: Journal of Photonics for Energy
• 影响因子: 1.7
• 作者: Lafalce, Evan;Huynh, Uyen;Olejnik, Ella;Basel, Tek P.;Ehrenfreund, Eitan;Vardeny, Zeev Valy
• 通讯作者: Vardeny, Zeev Valy

Spin-Dependent Charge-Carrier Recombination Processes in Tris (8-Hydroxyquinolinato) Aluminum

三（8-羟基喹啉）铝中自旋相关的电荷载流子复合过程

• DOI: 10.1103/physrevapplied.14.034012
• 发表时间: 2020
• 期刊: Physical Review Applied
• 影响因子: 4.6
• 作者: Popli, H.;Liu, X.;Tennahewa, T.H.;Teferi, M.Y.;Lafalce, E.;Malissa, H.;Vardeny, Z.V.;Boehme, C.
• 通讯作者: Boehme, C.

Study of spin transport in polyfluorene films

• DOI: 10.1117/1.jpe.8.032212
• 发表时间: 2018-05
• 期刊: Journal of Photonics for Energy
• 影响因子: 1.7
• 作者: Haoliang Liu;M. Groesbeck;E. Lafalce;Xiaojie Liu;Z. Vardeny

Triplet exciton fine structure in Pt-rich polymers studied by circularly polarized emission under high magnetic field

• DOI: 10.1103/physrevb.98.155205
• 发表时间: 2018-10
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: Chuang Zhang;D. Sun;R. McLaughlin;D. Semenov;S. McGill;Zhi-Gang Yu;E. Ehrenfreund;Z. Vardeny