Collaborative Research: The Impact of Mesoscale Structure on Multiexciton Dynamics of Macromolecules

合作研究：介观结构对大分子多激子动力学的影响

• 批准号: 2004683
• 负责人: Matthew Sfeir
• 金额: $ 24.13万
• 依托单位: Research Foundation CUNY - Advanced Science Research Center
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-07-01 至 2024-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2004683&HistoricalAwards=false
• 关键词: Collaborative; Research; Impact; Mesoscale; Structure

This collaborative project studies intimate details of the way organic polymers can be designed for uses in next-generation solar cells and other light-active electronic devices. One promising but unproven way of harnessing light-energy efficiently involves a special class of organic molecules that, when properly assembled, can recover energy that is normally lost as heat. However, organizing these molecules in the optimal way has proven to be a challenge, such that the beneficial impacts of this approach have not been realized to date. This project develops a new approach to assembling light harvesting molecules so that they are organized in a brush-like arrangement. The researchers use ultrafast cameras to study the flow of energy of the assemblies and use this information to optimize their structures. The discoveries that ensue from these studies can lead to transformative technologies for energy and information applications. The collaboration provides the participating students with opportunities to: develop interdisciplinary communication skills; work in teams; tackle challenges outside their respective core subject; disseminate their findings to chemists, physicists, and the community as a whole. The principal investigators focus on outreach activities targeting socioeconomically challenged communities in Harlem, NY, as well young chemists and postdoctoral scientists, with particular emphasis on those who belong to under-represented groups in science. Multiple exciton generation is now a rapidly growing area in photophysics that has yet to be acutely understood. The molecular version of multiple exciton generation is singlet fission – the generation of two independent triplet excitons from a single photon. From this light harvesting mechanism, unconventional exciton dynamics can be envisioned to exploit a) the amplification properties that result when two excitons/charge carriers are created from one photon (optoelectronics), b) the rapid population of spin correlated quantum states (quantum information), or c) the activation of localized multielectron reaction centers (photochemistry and photocatalysis). This proposal is rooted in fundamental studies of organic macromolecule structure-property relationships that govern the singlet fission multiexciton dynamics necessary for future implementations in device architectures. The researchers use a molecular engineering approach to control fundamental multiexciton dynamics and exciton transport across multiple length scales – from individual molecules (triplet pair formation processes) to nano-/micro-scales (free triplet formation and transport). Understanding the influence of the chemical nature of the chromophores themselves and their spatial arrangement, strategically tethered within macromolecules, provides the fundamental information necessary to solve some of the unifying and inherent challenges in developing next generation singlet fission device concepts.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.

这个合作项目研究了有机聚合物如何被设计用于下一代太阳能电池和其他光敏电子设备的细节。一种很有希望但尚未被证实的有效利用光能的方法涉及到一种特殊的有机分子，当它被适当地组装起来时，可以回收通常以热量的形式损失的能量。然而，以最佳方式组织这些分子已被证明是一个挑战，因此这种方法的有益影响迄今尚未实现。该项目开发了一种组装光收集分子的新方法，使它们以刷子状排列。研究人员使用超快相机来研究组件的能量流动，并利用这些信息来优化它们的结构。从这些研究中得出的发现可以为能源和信息应用带来变革性的技术。合作为参与的学生提供了机会：发展跨学科的沟通技巧；团队合作；应对各自核心学科之外的挑战；将他们的发现传播给化学家、物理学家和整个社会。主要研究人员将重点放在针对纽约州哈莱姆区社会经济困难社区以及年轻化学家和博士后科学家的外展活动上，特别强调那些属于科学界代表性不足群体的人。多激子的产生现在是光物理学中一个快速发展的领域，但尚未得到深刻的理解。多激子产生的分子版本是单线态裂变-从一个光子产生两个独立的三重态激子。从这种光收集机制中，可以设想非常规激子动力学利用a)两个激子/电荷载流子由一个光子（光电子学）产生时产生的放大特性，b)自旋相关量子态的快速填充（量子信息），或c)局部多电子反应中心的激活（光化学和光催化）。该建议植根于有机大分子结构-性质关系的基础研究，这些关系控制着未来器件架构中实现所必需的单线态裂变多激子动力学。研究人员使用分子工程方法来控制基本的多激子动力学和激子跨多个长度尺度的传输——从单个分子（三重态对形成过程）到纳米/微尺度（自由三重态形成和传输）。理解发色团本身的化学性质以及它们在大分子中的空间排列的影响，为解决开发下一代单线态裂变装置概念中一些统一的和固有的挑战提供了必要的基本信息。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值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

Quantifying Exciton Transport in Singlet Fission Diblock Copolymers

• DOI: 10.1021/jacs.1c13456
• 发表时间: 2022-02-23
• 期刊: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
• 影响因子: 15
• 作者: He, Guiying;Yablon, Lauren M.;Sfeir, Matthew Y.
• 通讯作者: Sfeir, Matthew Y.

Charge transfer states impact the triplet pair dynamics of singlet fission polymers

电荷转移态影响单线态裂变聚合物的三线对动力学

• DOI: 10.1063/5.0029858
• 发表时间: 2020
• 期刊: The Journal of Chemical Physics
• 作者: He, Guiying;Busby, Erik;Appavoo, Kannatassen;Wu, Qin;Xia, Jianlong;Campos, Luis M.;Sfeir, Matthew Y.
• 通讯作者: Sfeir, Matthew Y.