A systematic optimisation procedure for both hardware and process parameters is being undertaken to develop a co-evaporation-based recipe for forming perovskite layers with the desired bandgap, suitable for tandem silicon/perovskite solar cells. HZB is leading the development of a process to co-evaporate high-quality, stable perovskites using the tool provided by Von Ardenne.

The aim is to gain process know-how to:

(i) enhance perovskite quality and stability to achieve high-efficiency, long-term stable cells;

(ii) refine the process to produce uniform layers on full wafers; and

(iii) demonstrate high deposition rates for increased throughput in the pilot line.

This report summarises the experimental work for Deliverable D3.2, which focuses on the uniform deposition of wide-bandgap perovskite absorber layers on larger M6-sized wafers using the co-evaporation process. A specialised chamber setup enabled partners to control evaporation rates and achieve uniform composition across the larger substrate area. Next steps will involve fine-tuning the deposition process and improving post-processing techniques, such as annealing and surface treatments, to consistently achieve the desired material properties.