Combined nanoscale strain and halide composition mapping in perovskite layers deposited on silicon for tandem solar cells.

This proposal concerns the very promising technology of tandem solar cells where hybrid halide perovskites (HHP) are used as an active layer on top of a silicon cell. Our aim is to simultaneously map, using the ID13 nano-beam, the strain, lattice orientation and halide distribution by combining XRD and XRF in pristine and aged samples. This will allow to gain fundamental insights into aging mechanisms of HHP films. After a first successful experiment in June 2023, we apply for a follow-up experiment. Samples obtained from two different deposition methods as well as films deposited on different substrates will be studied and compared. The microstructure of all above samples will be investigated in the sample plane. A second focus concerns the study of cross section samples of solar cells prepared in different conditions, in the perspective of depth-resolved studies of the HHP microstructure and halide composition

本提案聚焦于极具前景的串联太阳能电池技术，其中混合卤化物钙钛矿（hybrid halide perovskites, HHP）被用作硅电池顶部的活性层。我们的目标是利用ID13纳米束，结合XRD与XRF技术，同时绘制原始样品与老化样品中的应变、晶格取向及卤化物分布，从而深入理解HHP薄膜老化机制的基本原理。继2023年6月首次实验成功后，我们申请开展后续实验：研究并比较两种不同沉积方法所得样品及不同基底上沉积的薄膜，分析所有上述样品在平面内的微观结构；第二个重点是探究不同条件下制备的太阳能电池横截面样品，以期实现对HHP微观结构与卤化物组成的深度分辨研究。