Measuring system for time and spatially resolved optical spectroscopy

在半导体光学领域，时间分辨光致发光光谱是一种成熟的、信息量丰富的、稳健的无损研究光激发动力学的方法。这项技术是基于短脉冲激光光源对半导体材料的光激发和时间分辨发光信号的记录，由所申请的测量站中的条纹相机执行的。计划中的设置将用于菲利普斯-马尔堡大学物理系和化学系的几个小组的研究。对于半导体光谱学小组来说，该仪器将是实验工作的中心仪器。初级研究小组研究有机和钙钛矿半导体，以及混合材料和异质结构。时间分辨发光光谱被用来表征结构和光学性质之间的关系，光激发的输运机制，以及内界面的电荷和能量转移过程。此外，光学激发和结构弛豫之间的相互作用引起了人们的兴趣，导致了局域效应和极化子或准分子的形成。该仪器还将被半导体光子组用于二维半导体的表征，以提供关于太赫兹发射特性的补充信息，从这些信息可以推断潜在的电荷载流子动力学。此外，申请人所在环境中还有其他研究小组，在这些小组的研究中，建议的大型仪器可以发挥很大的优势，特别是在表征发光材料或有机-无机杂化材料等新化合物方面。将光谱和空间分辨信息与激发动力学相关联对于上述许多主题具有突出的重要性。一方面，激发载流子或激子的扩散行为可以被跟踪，并与光谱信息相关联，从而允许开发稳健的动力学模型。另一方面，发光动力学也可以与局部微结构相关联，例如用于表征非均质材料。在某些情况下，有针对性的实验需要非常精确地设置激励条件，动态过程在不同的时间尺度上发生，具体取决于材料。因此，对安装的灵活性有很高的要求，将从不同的供应商模块化购买。所应用的系统加强了各种材料动态过程研究的现有方法，并具有在未来合作项目中卓有成效地使用的潜力。

In the field of semiconductor optics, time-resolved photoluminescence spectroscopy is an established, informative and robust approach for non-destructive investigations of the dynamics of optical excitations. The technique is based on the optical excitation of semiconductor materials by a short-pulse laser source and the recording of the temporally resolved luminescence signal, which is performed by a streak camera in the measuring station applied for here. The planned setup will be used in the research of several groups of the departments of physics and chemistry at the Philipps-Universität Marburg. For the semiconductor spectroscopy group, the instrument will be the central apparatus for experimental work. The junior research group investigates organic and perovskite semiconductors, as well as hybrid materials and heterostructures. Time-resolved luminescence spectroscopy is employed to characterize the relationships between structural and optical properties, transport mechanisms of optical excitations, and charge and energy transfer processes at internal interfaces. Furthermore, the interactions between optical excitations and structural relaxation are of interest, leading to localization effects and the formation of polarons or excimers. The instrument will also be used by the Semiconductor Photonics group for the characterization of two-dimensional semiconductors to provide complementary information on terahertz emission characteristics from which the underlying charge carrier dynamics can be inferred. Moreover, there are other research groups in the applicant's environment in whose research the proposed large-scale instrument can be used to great advantage, especially for characterizing novel compounds such as luminophores or organic-inorganic hybrid materials. Correlating the spectrally and spatially resolved information with excitation dynamics is of outstanding importance for many of the topics mentioned above. On the one hand, the diffusion behavior of excited charge carriers or excitons can be traced and correlated with spectral information, allowing for the development robust kinetic models. On the other hand, luminescence dynamics can also be correlated with local microstructure, for example to characterize heterogeneous materials. In certain cases, the targeted experiments require a very precise setting of the excitation conditions and the dynamic processes take place on a variety of time scales, depending on the material. Therefore, there are high demands regarding the flexibility of the setup, which will be purchased modularly from different suppliers. The system applied for strengthens the available methodology for the investigation of dynamic processes in a variety of materials and bears the potential for fruitful usage in future collaborative projects.