Collaborative Research: Tailoring Terahertz Emission in Ultrafast Multi-Functional Devices using Reduced-Dimensional Hybrid Metal Perovskites

合作研究：使用降维混合金属钙钛矿定制超快多功能器件中的太赫兹发射

• 批准号: 1933297
• 负责人: Dali Sun
• 金额: $ 19.54万
• 依托单位: North Carolina State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-09-01 至 2022-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1933297&HistoricalAwards=false
• 关键词: Collaborative; Research; Tailoring; Terahertz; Emission

Nontechnical: Terahertz technologies hold great promise for future computing and communications. Energy-efficient and miniaturized THz sources using light-weight, low-cost, and robust materials are a long sought goal. Few materials, however, possess the attributes needed to realize working devices. Metal halide perovskites with reduced dimensionality are a new class of semiconductors with great promise for such applications. They can be inexpensively synthesized and solution processed, have attractive electronic properties, and tolerate defects. These properties have led to great interest for applications in solar cells and flexible displays. Perovskites also show promise as high performance THz sources. Remarkably, these properties can be controlled via spin electronics (spintronics) that exploit the fundamental properties of electrons in devices. This makes it possible to interface perovskites with magnetic materials, enabling spintronic THz emitters. This project will lead to low-cost and energy-efficient THz devices with complementary magnetic, optical and electronic functions. The PIs will educate graduate and undergraduate students, including those from underrepresented groups, by integrating research with education. Established and developing outreach programs will be used to involve K-12 students with the project.Technical:This project focuses on the realization of a spintronic control of the broadband THz emission in RD-HMH/Ferromagnet heterostructures. The research consists of three research thrusts: (1) Demonstrate the proof-of-concept spintronic hybrid THz emitter using reduced dimensional-hybrid metal halide (RD-HMH) polycrystalline thin films prepared by a low-cost spin-coating approach, taking advantage of the fast relaxation of spin (akin to a switch) and efficient spin-to-charge interconversion thanks to the heavy metal elements in RD-HMHs. A thorough, fundamental physical understanding of the ultrafast generation of THz emission in RD-HMH/Ferromagnet heterostructures will be unraveled. (2) Tailor the THz emission via engineering RD-HMH single crystals. Wafer-scale single crystals-based THz emitters will be designed and optimized with tunable bandwidth as well as high quality (Q-) factors, in complement to that of polycrystalline-film emitters. (3) Optimize the THz emission via versatile chemical synthetic routes using device building blocks. The available pool of high-quality synthesized RD-HMH candidates with tunable quantum-well effects are ready to be fabricated into efficient THz emitters, allowing the spintronic and magnetic control of THz generation that can be potentially used for logic applications utilizing THz-wave emission and absorption.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

非技术性：太赫兹技术为未来的计算和通信带来了巨大的希望。使用轻质、低成本和坚固材料的低能效和小型化太赫兹光源是一个长期追求的目标。然而，很少有材料具有实现工作装置所需的属性。降维金属卤化物钙钛矿材料是一类具有广阔应用前景的新型半导体材料。它们可以廉价地合成和溶液处理，具有诱人的电子性能，并容忍缺陷。这些特性使人们对太阳能电池和柔性显示器的应用产生了极大的兴趣。钙钛矿也显示出作为高性能太赫兹源的前景。值得注意的是，这些性质可以通过自旋电子学(自旋电子学)来控制，自旋电子学利用设备中电子的基本属性。这使得钙钛矿与磁性材料的接口成为可能，从而使自旋电子太赫兹发射器成为可能。该项目将导致低成本和高能效的太赫兹器件，具有互补的磁、光和电功能。私人投资机构将通过将研究与教育相结合的方式，教育研究生和本科生，包括那些来自代表性不足群体的学生。建立和发展的外展计划将被用来让K-12的学生参与到这个项目中。技术：这个项目专注于实现对RD-HMH/铁磁异质结中的宽带THz发射的自旋电子控制。本研究包括三个研究方向：(1)利用低成本旋涂方法制备的降维杂化金属卤化物(RD-HMH)多晶薄膜，利用RD-HMHS中的自旋快速弛豫(类似于开关)和高效的自旋到电荷的相互转换，展示了概念验证的自旋电子混合太赫兹发射器。我们将对RD-HMH/铁磁异质结中THz辐射的超快产生有一个彻底的、基本的物理理解。(2)通过工程化RD-HMH单晶来定制THz辐射。晶片规模的基于单晶基的太赫兹发射器将被设计和优化，具有可调带宽和高质量(Q-)系数，作为对多晶膜发射器的补充。(3)利用器件积木，通过多样化的化学合成路线优化太赫兹辐射。现有的具有可调量子井效应的高质量合成RD-HMH候选者池已准备好被制造成高效的THz发射器，允许对THz产生进行自旋电子和磁控制，从而潜在地用于利用THz波发射和吸收的逻辑应用。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Spintronic Terahertz Emission in Ultrawide Bandgap Semiconductor/Ferromagnet Heterostructures

• DOI: 10.1002/adom.202201535
• 发表时间: 2022-10
• 期刊: Advanced Optical Materials
• 影响因子: 9
• 作者: Andrew R. Comstock;Melike Biliroglu;Dovletgeldi Seyitliyev;Aeron McConnell;E. Vetter;P. Reddy;R. Kirs

Tuning of spin-orbit coupling in metal-free conjugated polymers by structural conformation

• DOI: 10.1103/physrevmaterials.4.085603
• 发表时间: 2020-08-28
• 期刊: PHYSICAL REVIEW MATERIALS
• 影响因子: 3.4
• 作者: Vetter, Eric;VonWald, Ian;Sun, Dali
• 通讯作者: Sun, Dali