Harnessing the Advantages of Dark Exciton in Perovskite Nanostructures as the Quantum Emitter and the Source of Charge Carriers

利用钙钛矿纳米结构中暗激子的优势作为量子发射器和电荷载流子源

• 批准号: 2304936
• 负责人: Dong Son
• 金额: $ 48.97万
• 依托单位: Texas A&M University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-09-01 至 2026-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2304936&HistoricalAwards=false
• 关键词: Harnessing; Advantages; Dark; Exciton; Perovskite

With support from the Macromolecular, Supramolecular, and Nanochemistry Program in the Chemistry Division, Professor Dong Hee Son at Texas A&M University will investigate the role of dark excitons in lead halide perovskite nanocrystals for generating light and charges with controlled quantum properties. Lead halide perovskite materials are recognized as efficient sources of light and charges for various applications such as photonics and solar cells. Professor Son's research team is studying lead halide perovskite materials at the few-nanometer size scale where a special excited state called the dark exciton becomes readily accessible. Dark excitons can have lifetimes a thousand-fold longer than the typical excited state in these materials. Additionally, dark excitons have the ability to generate light with properties that differ from those derived from the usual excited states. Professor Son's team is exploring effective ways of utilizing the dark excitons to produce light and charges with new properties that were previously unavailable, benefiting from the unique properties of the dark exciton. In addition to the scientific activities, this project will contribute to the training of graduate students in cutting edge experimental physical chemistry; this includes studies from groups underrepresented in the chemical sciences. Professor Son's team also plans to engage in outreach to K-12 students and to the local community through University-run public events. The Son research team is investigating the role of the dark exciton and its advantages in generating photons and charges with controllable quantum properties that cannot be readily obtained from the bright exciton. This project is focusing specifically on the energy and relaxation dynamics of single- and bi-exciton states formed from dark excitons, as well as the emissions of correlated photon pairs from dark excitons and spin-polarized states. These photon emission processes are enhanced by dark state longevity as well as new coupling pathways afforded by the dark excitons in lead halide perovskite nanocrystals. This research will leverage recent success by the Son group in accessing and probing the energetics and dynamics of the dark excitons separately from the bright excitons. This separate characterization of dark excitons is enabled by the confinement-enhanced bright-dark energy splitting in strongly quantum-confined perovskite nanocrystals. The research team combines the controllable magnetic doping and flexible ligand passivation in these nanocrystals, in conjunction with the high Q-factor microcavity, to provide enhanced interaction of light and nanocrystals, thereby exploring the advantages of the dark exciton in creating photons and charges with controllable characteristics.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.

在化学部的大分子，超分子和纳米化学计划的支持下，得克萨斯州A＆M大学的Dong Hee Son教授将调查Dark Excitons在Halide Halide Perovskite纳米晶体中的作用，以产生具有控制量子性能的光和电荷。铅卤化物钙钛矿材料被认为是光子和太阳能电池等各种应用的有效光源和电荷。 Son教授的研究团队正在研究铅卤化物钙钛矿材料的尺寸尺寸，在该尺寸上，一个称为“黑暗激子”的特殊兴奋状态很容易访问。黑暗激子的寿命比这些材料中典型的激发状态长一千倍。此外，深色激子具有与从常规激发态衍生的特性不同的特性产生光的能力。儿子教授的团队正在探索有效的方法，利用黑暗激情子来生产带有以前不可用的新属性的光和费用，这受益于深色激子的独特属性。除了科学活动外，该项目还将有助于对尖端实验化学化学的研究生培训；这包括来自化学科学中代表性不足的小组的研究。儿子教授的团队还计划通过大学举办的公共活动与K-12学生和当地社区进行宣传。儿子研究团队正在研究黑暗激子的作用及其在产生具有可控量子特性的光子和电荷方面的优势，而这些量子特性无法轻易从明亮的激子获得。该项目专门针对由深色激子形成的单个和双脱核状态的能量和松弛动力学，以及来自深色激子和自旋极化状态的相关光子对的排放。这些光子发射过程通过深色状态寿命以及铅卤化物钙钛矿纳米晶体中深色激子提供的新耦合途径增强。这项研究将利用Son Group的最新成功来访问和探测与明亮的激子分开的黑暗激子的能量和动力学。深色激子的这种单独的表征是通过强烈量子限制的perovskite纳米晶体中限制增强的明亮黑暗能量分裂来实现的。研究团队结合了这些纳米晶体中可控的磁掺杂和柔性的配体钝化，并结合了高Q因子微腔内，以增强光和纳米晶体的相互作用，从而探索使用可控的奖励，并探索Dark Interys and the Take and the dection nissf的功能。基金会的智力优点和更广泛的影响评论标准。