Probing dynamics in perovskite nanocrystals with quantum confinement and doping

通过量子限制和掺杂探测钙钛矿纳米晶体的动力学

• 批准号: 571345-2021
• 负责人: Kambhampati, PatanjaliP
• 金额: $ 1.82万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=747464
• 关键词: Probing; dynamics; perovskite; nanocrystals; quantum

Semiconductor perovskites have rapidly emerged onto the materials science scene since their tremendous initial performance in photovoltaic films in 2014. These perovskites are among the hottest materials in science now for their promise in optoelectronic applications and their new physics. In this proposal we will for the first time follow the full Life Cycle spanning birth of an excitation from initial polaron formation, to exciton formation, to exciton thermalization, to excitonic emission in new perovskite nanocrystals using a suite of three state-of-the-art spectroscopies, made uniquely possible by a one-of-a-kind ultrafast spectroscopy lab. With these three tools of two dimensional electronic spectroscopy (2DE), state-resolved pump/probe (SRPP) spectroscopy, and time-resolved photoluminescence (t-PL) spectroscopy we will monitor all aspects of the dynamical birth, quantum-kinetic evolution, and thermodynamic death of an electronic excitation in a set of novel perovskite system. Following our initial work on bulk perovskite nanocrystals, we will collaborate with Dong Hee Son (Texas A&M) to probe their newest perovskites including quantum dot perovskites and atomically doped perovskites. The impact of this work will be an understanding of structure-function relationships in the newest and most compelling of optoelectronic materials in decades. Our competitive advantage is our world leading ultrafast laser spectroscopy facilities and our prior 15 years expertise in ultrafast exciton dynamics in quantum dots. With the DH Son group we establish a high profile international partnership that will enable discovery grade science and for our group to learn new materials systems. This collaboration will strengthen Canadian international research networks and bring new science to Canadian researchers and provide value added training to HQP.

半导体钙钛矿自2014年在光伏薄膜中表现出巨大的初始性能以来，已迅速出现在材料科学领域。这些钙钛矿是目前科学界最热门的材料之一，因为它们在光电应用和新物理学方面的前景。在这项提案中，我们将首次跟踪整个生命周期，从初始极化子形成到激子形成，到激子热化，再到新钙钛矿纳米晶体中的激子发射，使用一套三种最先进的光谱学，由独一无二的超快光谱实验室独特地实现。利用二维电子光谱（2DE）、状态分辨泵浦/探测（SRPP）光谱和时间分辨光致发光（t-PL）光谱这三种工具，我们将监测一组新型钙钛矿体系中电子激发的动力学诞生、量子动力学演化和热力学死亡的各个方面。在我们对大块钙钛矿纳米晶体的初步研究之后，我们将与Dong Hee Son（德克萨斯A&M）合作，探测他们最新的钙钛矿，包括量子点钙钛矿和原子掺杂钙钛矿。这项工作的影响将是几十年来最新和最引人注目的光电材料中结构-功能关系的理解。我们的竞争优势是我们世界领先的超快激光光谱设备和我们在量子点超快激子动力学方面的15年专业知识。我们与DH Son集团建立了一个备受瞩目的国际合作伙伴关系，这将使发现级科学成为可能，并使我们的集团能够学习新的材料系统。这项合作将加强加拿大的国际研究网络，为加拿大研究人员带来新的科学，并为HQP提供增值培训。