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Resonant Photoemission on Organic Thin Films and Interfaces

有机薄膜和界面上的共振光电发射

基本信息

批准号：
227461156
负责人：
Professor Dr. Friedrich Reinert
金额：
--
依托单位：
Lehrstuhl für Experimentelle Physik VII
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2013
资助国家：
德国
起止时间：
2012-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/227461156?language=en
关键词：
Resonant Photoemission Organic Thin Films

项目摘要

The unique physical properties of organic materials are crucially influenced by the coupling of the single molecule to its local surrounding. In particular, dynamic processes, which determine e.g. the macroscopic transport characteristics or the optical properties, are influenced by complex interaction mechanisms. Ultimately, a microscopic understanding of these mechanisms is the basis for a specific control of the system properties. In contrast to perfectly long-range ordered solids, the respective mechanisms can be less clearly distinguished in condensed organic systems, thus requiring expensive preparation and analysis methods. In this project resonant Photoelectron Spectroscopy (ResPES) will be applied for the systematic investigation of the electronic structure of organic semiconductor films. The method is based on the local excitation of a core electron. The induced many particle processes, which are generally well understood from a theoretical viewpoint, bear characteristic spectral information, which allow conclusions on the dynamic properties of the electronic or molecular system, respectively. These many particle processes occur on a much smaller energy scale than the primary excitation and can contain e.g. a local screening of the core hole, intermolecular charge transfer, or collective vibronic or electronic excitations. In this project we will specifically investigate: - The sensitivity of the ResPES-spectra for external influences on molecules in case of weak binding: ResPES-spectra show characteristic fine structures, which can be attributed to the coupling of the excited intermediate state to molecular vibrations. This vibronic signature shows differences if the molecules are examined in different surrounding, even if the chemical bonding is weak. - The temporal sequence of charge transfer processes via the ‘core-hole clock ‘-method: the charge transfer following the electronic excitation will be investigated in thin molecular films, at molecule/metal-interfaces, and at heterointerfaces (molecule A/molecule B). This project aims on the systematic investigation of the physical coupling of particular organic molecules to the surrounding and its effect on vibronic and electronic excitations. It will improve the microscopic understanding of organic molecular materials.

有机材料的独特物理性质受到单个分子与其局部环境的耦合的关键影响。具体地，确定例如宏观传输特性或光学性质的动态过程受复杂的相互作用机制的影响。归根结底，对这些机制的微观理解是对系统属性进行具体控制的基础。与完全长程有序固体相比，在浓缩有机体系中，各自的机理可能不太清楚，因此需要昂贵的制备和分析方法。在本项目中，将应用共振光电子能谱(ResPES)系统地研究有机半导体薄膜的电子结构。该方法是基于核心电子的局域激发。诱导的许多粒子过程通常从理论上被很好地理解，它们带有特征光谱信息，这些信息分别允许得出关于电子或分子系统的动力学性质的结论。这些许多粒子过程发生在比初级激发小得多的能量尺度上，并且可以包含例如核心空穴的局部屏蔽、分子间电荷转移或集体振动或电子激发。在这个项目中，我们将具体研究：-在弱结合情况下，ResPES光谱对外部影响分子的敏感性：ResPES光谱显示出特征的精细结构，这可以归因于激发中间态与分子振动的耦合。如果在不同的环境中检查分子，即使化学键很弱，这种振动特征也会显示出不同。-通过‘核心-空穴时钟’的电荷转移过程的时间序列-方法：将在分子薄膜、分子/金属界面和异质界面(分子A/分子B)中研究电子激发后的电荷转移。该项目旨在系统地研究特定有机分子与周围环境的物理耦合及其对振动和电子激发的影响。这将提高人们对有机分子材料的微观认识。