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

串联太阳能电池由于其与单结太阳能电池相比固有的更高效率而具有最重要的意义。然而，显著更大数量的层导致更高的复杂性，并且对于串联电池需要比对于单结太阳能电池严格得多的质量控制。在这个研究项目中，我们建议开发的缺陷成像方法和例程的能力，在多层堆栈中定位缺陷，并明确地将其发生分配到各个层。对于串联技术来说，唯一的知识是缺陷发生在哪一层。最重要的是，这将使我们能够更深入地了解缺陷的性质，预计这将导致对串联电池的材料和加工要求的更好理解。此外，我们预计，拟议的研究将导致测量方法，允许探测基于低掺杂的溶液处理的半导体复合层的功能。我们建议分两个阶段执行该研究项目。本提案适用的第一阶段为两年。第一阶段的目标是开发有机叠层太阳能电池的适当成像方法。如果该任务成功完成，我们建议再花2年时间研究成像技术的功能和相关性，以进一步实现基于a-Si：H或GaAs的串联技术。

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.