Spin dynamics of excitons, carriers and nuclei in metal halide perovskite nanostructures

金属卤化物钙钛矿纳米结构中激子、载流子和原子核的自旋动力学

• 批准号: 527080192
• 负责人: Professor Dr. Dmitri Yakovlev, Ph.D.
• 金额: --
• 依托单位: Laboratory of Inorganic Chemistry
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/527080192?language=en
• 关键词: Spin; dynamics; excitons; carriers; nuclei

The project goal is to study energy and spin structure of exciton complexes in low dimensional metal halide perovskites nanostructures (nanocrystals and 2D layers) and to clarify the role of quantum confinement on the spin-related parameters and on the spin-dependent phenomena. We plan technological and experimental studies being supported by collaboration with theorists. Synthesized samples will be all-inorganic and organic-inorganic lead halide perovskite nanocrystals of various sizes and chemical compositions, and 2D layered materials with thickness ranged from 1 to 5 monolayers. Also, 2D samples will be fabricated with Pb substituted by Sn for lead-free materials or doped with magnetic Mn-ions to prove the concepts of diluted magnetic semiconductors. For experimental studies optical techniques, involving low temperatures, high magnetic fields up to 60 T, polarization analysis, time-resolution in temporal range from 200 fs to seconds and high spectral resolution will be used. We will focus on spin-dependent phenomena and spin dynamics of interacting spin systems of carriers (electrons and holes), excitons (neutral and charged) and nuclei spins by measuring g-factors, spin relaxation and spin coherence times and identifying mechanisms of spin-spin interactions. In Mn-doped samples interaction with localized Mn-spins will be additionally involved, which typically results in giant magneto-optical effects. We will search for new physical phenomena and new regimes of the known phenomena provided by the unique properties of the perovskites. The gained knowledge will be used for optimizing technology, parameters of light-emitting devices and for testing the feasibility of the perovskite nanostructures for spintronics applications.

该项目的目标是研究低维金属卤化物钙钛矿纳米结构（纳米晶体和二维层）中激子复合物的能量和自旋结构，并阐明量子限制对自旋相关参数和自旋相关现象的作用。我们计划在与理论家合作的支持下进行技术和实验研究。合成的样品将是各种尺寸和化学成分的全无机和有机-无机卤化铅钙钛矿纳米晶体，以及厚度为1至5个单层的二维层状材料。此外，还将用无铅材料中的锡替代铅或掺杂磁性锰离子来制造二维样品，以证明稀释磁性半导体的概念。对于实验研究光学技术，将使用涉及低温、高达 60 T 的高磁场、偏振分析、时间范围从 200 fs 到秒的时间分辨率以及高光谱分辨率。我们将通过测量 g 因子、自旋弛豫和自旋相干时间并识别自旋-自旋相互作用的机制，重点研究载流子（电子和空穴）、激子（中性和带电）和核自旋相互作用的自旋系统的自旋相关现象和自旋动力学。在锰掺杂样品中，还将涉及与局域锰自旋的相互作用，这通常会导致巨大的磁光效应。我们将寻找钙钛矿独特性质所提供的新物理现象和已知现象的新机制。所获得的知识将用于优化发光器件的技术、参数以及测试钙钛矿纳米结构在自旋电子学应用中的可行性。