Nanomorphological characterisation, homogeneity and stability of printed solar cells

这个项目是合作研究工作的一部分，目的是通过了解工业制造设备中涉及的基本光物理和纳米结构过程，实现可靠的高性能、大规模、有机光伏处理。在我们的子项目中，我们希望通过揭示我们通过仔细控制沉积过程和系统探索后处理来刻意选择特定纳米结构和形貌(ns&m)的可能性和限制，从而为这一总体目标做出贡献。刮刀涂布的结果可以很好地转移到凹版印刷上。此外，许多决定性的加工参数可以很容易地在较大的参数空间中改变。因此，我们通过刀片涂层进行系统的研究，使用各种加工参数，如溶剂、成分、温度、添加剂、膜厚等，然后我们将使用后处理来进一步操纵ns&m。记录刀片涂层过程中结构形成过程的时间分辨光谱数据，使我们能够获得包含作为加工函数的聚集和相分离行为信息的处理特征。用X射线散射仪对相关的最终薄膜进行了结构表征。从容易获得的加工特征，结合详细的结构研究，我们可以从根本上理解实验决定结构形成的机制。我们的目标是获得足够的基础知识，以便能够仅通过记录加工签名来建议新材料的加工参数。此外，我们将研究毫米尺度上的微结构不均匀对潜在的ns&m的影响，并使用先前获得的理解来抵消有害结构形成的影响。与其他项目相结合，我们将能够对印刷有机光伏中结构-功能关系的整体理解做出贡献。

This project is part of the collaborative research effort POPULAR with the goal to enable reliable high performance, large scale, organic photovoltaic processing by understanding the fundamental photophysical and nanostructural processes involved in industrially fabricated devices.In our subproject we want to contribute to this overall goal by revealing the possibilities and limitations we have in deliberately choosing a particular nanostructure and -morphology (ns&m) by carefully controlling the deposition process and systematically exploring postprocessing. Results from blade coating are well transferable to gravure printing. Additionally, many decisive processing parameters can be easily varied in a large parameter space. Hence, we carry out our systematic studies via blade coating with various processing parameters like solvents, composition, temperature, additives, film thickness etc. We will then use postprocessing to further manipulate the ns&m. Recording time-resolved spectroscopic data of the structure formation process during blade coating gives us access to processing signatures that contain information on aggregation and phase separation behavior as a function of processing. Relevant final films are structurally characterized using x-ray scattering. From the easily accessible processing signatures, in combination with detailed structural studies we can fundamentally understand the experimentally decisive structure formation mechanisms. We aim to gain enough fundamental understanding to be able to suggest processing parameters for new materials solely by recording processing signatures. Furthermore, we will examine the effect of microstructural inhomogeneities on the mm-scale on the underlying ns&m and use the previously gained understanding to counteract detrimental structure formation effects. In combination with the other projects we will be able to contribute to a holistic understanding of structure—function relationships in printed organic photovoltaics.