UniJet - Inkjet Printing Technology for Perovskite/Si Solar Cell

This presentation explores the application of inkjet printing technology for the fabrication of perovskite/silicon tandem solar cells, where scalable and material-efficient deposition processes are increasingly critical. Compared to conventional techniques such as slot-die coating and vacuum evaporation, inkjet printing offers distinct advantages in digital patterning, material utilization, higher throughput and process flexibility.

We systematically investigate inkjet-based deposition across multiple functional layers, including self-assembled monolayers (SAM), SnO₂ electron transport layers, perovskite absorbers, and multi-step organic layers. Process optimization and film quality are evaluated based on higher uniformity up to 1% of the deposited thickness, convenient thickness control, and less material consumption.

Experimental results demonstrate the feasibility of inkjet printing for high-quality layer formation, with competitive performance and potential benefits in reduced solvent usage, lower thermal budget, and overall manufacturing cost. The study highlights inkjet printing as a promising pathway toward scalable, high-throughput production of tandem solar cells, which can achieve 4000 wafers per hour.

UniJet will present initial integration results and discuss the potential of inkjet technology as a key enabler for next-generation photovoltaic manufacturing.