Nanomorphological characterisation, homogeneity and stability of printed solar cells

该项目是POPULAR合作研究工作的一部分，目标是实现可靠的高性能，大规模，通过理解工业制造设备中涉及的基本物理和纳米结构过程，来进行有机光伏处理。在我们的子项目中，我们希望通过揭示我们在故意选择特定纳米结构和纳米形态（ns&m）时的可能性和局限性，为这一总体目标做出贡献。通过仔细控制沉积过程和系统地探索后处理。刮刀涂布的结果很好地转移到凹版印刷。此外，许多决定性的工艺参数可以在大的参数空间中容易地改变。因此，我们进行了系统的研究，通过刮刀涂布与各种工艺参数，如溶剂，成分，温度，添加剂，薄膜厚度等，然后我们将使用后处理，以进一步操纵ns&m。在刮刀涂布期间记录结构形成过程的时间分辨光谱数据使我们能够访问包含关于作为加工函数的聚集和相分离行为的信息的加工特征。使用X射线散射对相关最终膜进行结构表征。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性的结构形成机制。我们的目标是获得足够的基本理解，以便能够仅通过记录加工特征来建议新材料的加工参数。此外，我们将研究微观结构的不均匀性的影响，在毫米尺度上的基础ns和m，并使用以前获得的理解，以抵消有害的结构形成的影响。与其他项目相结合，我们将能够有助于对印刷有机光化学中结构-功能关系的全面理解。

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.