Perovskite microcrystals are a promising material to make high-yielding, thin-film solar cells. They can be processed into thin, light-weight and potentially semitransparent modules that could eventually be integrated in building materials such as windows or curved construction elements. Solliance and its research partners focus on using scalable, industrial processes towards the fabrication of large-area modules, eventually suitable for seamless integration in a broad variety of PV systems.
The R2R process was developed for both the electron transport and the perovskite layers on the new Solliance dual R2R coating line, as developed by Solliance with its partners VDL Enabling Technologies Group (VDL ETG), Smit Thermal Solutions and Bosch-Rexroth. The in-line R2R coating, drying and annealing processes were executed at a linear speed of 5 mpm on a 300-mm-wide commercial PET/ITO foil and under ambient conditions. After applying a newly developed off-line single device finishing step, individual solar cells of 0.1 cm2 achieved efficiencies of up to 12.6%, measured under maximum power point tracking conditions during 5 mins. All process steps on this R2R line were performed using low-cost materials while keeping the process temperatures below 120⁰ C. This shows the high-volume production potential of this new emerging thin-film PV technology.
“The demonstration of R2R processing at 5 mpm of perovskite layers for solar cells indicates that high-volume production, and hence with an expected very low cost, will be possible in the future," explains Pim Groen, Professor of SMART materials at the Technical University of Delft and Program Manager at Holst Centre/Solliance. ”These results show that the Solliance research partners, with their in depth know-how on processing of thin film PV devices and their extensive sheet-to-sheet and R2R pilot production infrastructure, are excellently placed to realize this upscaling.”
VDL ETG has been leading the consortium of equipment manufacturing companies that designed and built the innovative R2R coating line. VDL CEO Willem van der Leegte comments, “I am very pleased with this result. It shows that combining process know-how at Solliance with capabilities of high-tech equipment companies in this region can deliver very powerful results that potentially open up completely new business opportunities.”