Development of a Novel Charge Accumulation THz Spectroscopy System Operating in an Inert Atmosphere

开发在惰性气氛中运行的新型电荷积累太赫兹光谱系统

• 批准号: RTI-2020-00741
• 负责人: Razzari, Luca
• 金额: $ 10.81万
• 依托单位: Institut national de la recherche scientifique
• 依托单位国家: 加拿大
• 项目类别: Research Tools and Instruments
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=693642
• 关键词: Development; Novel; Charge; Accumulation; THz

Understanding charge transport in organic semiconductors (OS) is not trivial as this process is governed by electronphonon coupling, which refers to the interaction strength between electrons and phonons (i.e. collective molecular vibrations). Unlike in crystalline silicon, the weak non-covalent nature of the intermolecular interactions in OS does not allow to describe electrons and holes in terms of delocalized Bloch waves. Further, a clear picture of the so-called band-like transport is currently missing, partially because electron-phonon interactions are very hard to probe experimentally. However, while techniques such as Raman spectroscopy or neutron scattering could provide a detailed mapping of the phonon/vibrational modes, they fail in probing the interactions of free charges with the phonon modes. ******To fill this major gap, we request the purchase of a customized equipment, a fiber-coupled THz system to be combined with a glovebox, that will allow to pioneer a novel type of spectroscopy, Charge Accumulation THz spectroscopy (CATS), which for the first time will measure in situ electron-phonon interactions in molecular materials. Several research groups at INRS-EMT and in the Montreal area have expressed their interest in exploiting this tool to perform the suggested research. Such novel spectroscopic technique (CATS) promises to represent a major advance in Materials Science and Synthetic Chemistry, as it could give a clear indication of which (molecular) materials are best suited for applications in electronics.***By correlating the collected spectral features in absence and in presence of charges, we could make an efficient screening of the suitability of a given organic molecular design (in the case of OS) for electronics. In the short term, CATS could be extended to other materials such as organic-halide perovskites or quantum dots, which have strong phononic response in the THz range. In the long term, the generated knowledge could support future adoption of CATS as a routine screening tool of materials for electronics.******The strong track records and complementary expertise of the applicants will ensure the productive management and overall success of the proposed research. Furthermore, given the multi-purpose and versatile nature of the requested toolkit, its use will allow to train HQP in at least 7 other research teams, which would make a total of ca. 50 Ph.D. students, 20 post-doctoral fellows (PDFs), 20 M.Sc. students, and will be also available to summer students. Since CATS is a novel and powerful technique that will be developed at INRS-EMT, it has a huge potential to provide marketable skills for all HQP trained on the equipment. The requested equipment will also open up opportunities for broad collaborations with industries and universities and thus enhance the students' training by exposing them to industrial working environments and allowing them to interact with key players in Canada and elsewhere.**

了解有机半导体（OS）中的电荷传输并不是微不足道的，因为此过程受电子耦合的控制，这是指电子和声子之间的相互作用强度（即集体分子振动）。与结晶硅不同，OS中分子间相互作用的弱非共价性质不允许用离域的BLOCH波描述电子和孔。此外，目前缺少了所谓的带状传输的清晰图片，部分是因为电子 - phonon相互作用很难通过实验探测。但是，尽管拉曼光谱或中子散射等技术可以提供声子/振动模式的详细映射，但它们无法探测自由电荷与声子模式的相互作用。 ******为了填补这一主要空白，我们要求购买定制设备，即与杂物箱结合使用的光纤耦合的THZ系统，这将允许开拓新型的光谱，电荷积累THZ光谱（CATS），这将首次测量属性电子量相互作用，以实现分子材料。 INRS-EMT和蒙特利尔地区的几个研究小组表达了他们对利用此工具进行建议的研究的兴趣。这种新型的光谱技术（CAT）有望代表材料科学和合成化学方面的重大进步，因为它可以清楚地表明哪种（分子）材料最适合于电子产品中的应用。在短期内，猫可以扩展到其他材料，例如有机壁孔孔或量子点，这些点在THZ范围内具有强烈的语音响应。从长远来看，生成的知识可以支持将来采用猫作为电子产品材料的常规筛选工具。此外，鉴于所需工具包的多功能性和多功能性，其使用将允许在至少7个其他研究团队中训练HQP，这将使总共大约有所了解。 50博士学生，20名博士后研究员（PDFS），20 M.Sc。学生，也将为夏季学生提供。由于CAT是一种新颖而强大的技术，它将在INRS-EMT开发，因此它具有为所有受过设备培训的HQP提供可销售技能的巨大潜力。所请求的设备还将为与行业和大学的广泛合作提供机会，从而通过使学生接触到工业工作环境，并允许他们与加拿大和其他地方的主要参与者进行互动来增强学生的培训。**