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建立的、信息丰富的、可靠的非破坏性研究光激发动力学的方法。该技术是基于短脉冲激光源对半导体材料的光激发，并通过测量站的条纹相机记录时间分辨的发光信号。计划中的装置将用于Philipps-Universität马尔堡物理系和化学系的几个小组的研究。对于半导体光谱学组，该仪器将是实验工作的中心设备。这个初级研究小组研究有机和钙钛矿半导体，以及杂化材料和异质结构。时间分辨发光光谱用于表征结构与光学性质之间的关系、光激发的输运机制以及内部界面的电荷和能量转移过程。此外，光激发和结构弛豫之间的相互作用引起了人们的兴趣，从而导致了局域化效应和极化子或准分子的形成。该仪器还将被半导体光子学小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，由此可以推断出潜在的载流子动力学。此外，在申请人所处的环境中，还有其他研究小组，其研究中所提出的大型仪器可以用于很大的优势，特别是用于表征新型化合物，如发光团或有机-无机杂化材料。将光谱和空间分辨信息与激励动力学相关联对于上述许多主题都具有重要意义。一方面，可以跟踪受激载流子或激子的扩散行为，并将其与光谱信息相关联，从而可以建立稳健的动力学模型。另一方面，发光动力学也可以与局部微观结构相关联，例如表征非均质材料。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，并且根据材料的不同，动态过程在各种时间尺度上发生。因此，对设置的灵活性有很高的要求，这将从不同的供应商模块化购买。所应用的系统加强了研究各种材料动态过程的现有方法，并具有在未来合作项目中有效使用的潜力。

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.