Development of novel imaging techniques for the identification of loss mechanisms in tandem solar cells

串联太阳能电池是最重要的，由于其固有的更高的效率相比，单结太阳能电池。然而，与单结太阳能电池相比，更大的层数导致了更高的复杂性，并且需要更严格的质量控制。在本研究项目中，我们建议开发缺陷成像方法和程序，以定位多层堆叠中的缺陷，并明确地将其发生分配到单个层。对于串联技术来说，缺陷发生在哪个层的独特知识是最重要的。最重要的是，这将使我们能够更深入地了解缺陷的性质，从而提高对串联电池的材料和加工要求的理解。此外，我们期望所提出的研究将导致测量方法，允许探测基于低掺杂溶液处理半导体的复合层的功能。我们建议分两个阶段进行这个研究项目。第一阶段为期两年。第一阶段的目标是在有机串联太阳能电池的手上开发合适的成像方法。如果这项任务成功完成，我们提出了另一个2年的第二阶段，我们想要研究成像技术的功能和相关性，以进一步的串联技术，如基于a- si:H或GaAs的技术。

Tandem solar cells are of outmost importance due to their inherently higher efficiency as compared to single junction solar cells. However, the significantly larger number of layers is causing higher complexity and requires a much more stringent quality control for tandem cells than for single junction solar cells. In this research project we propose to develop defect imaging methods and routines with the capacity to localize defects in multilayer stacks and to unambiguously assign their occurrence to individual layers. The unique knowledge in which layer a defect is occurring is of outmost relevance for the tandem technology. Most importantly this will allow us to gain deeper insight into the nature of defects which is expected to result in an improved understanding of the material and processing requirements for tandem cells. Further, we expect that the proposed research will lead to measurement methods allowing to probe the functionality of recombination layers based on low doped solution processed semiconductors.We propose to execute this research project in two phases. A first phase of two years is applied for in this proposal. This first phase aims to develop the proper imaging methods at the hand of organic tandem solar cells. If that task is finished successfully, we propose a 2nd period of another 2 years where we want to investigate the functionality and relevance of the imaging techniques for further tandem technologies like the ones based on a-Si:H or GaAs.