SITA Partners Share Key Innovations at TandemPV 2025

From 13–15 May 2025, members of the SITA consortium actively contributed to the TandemPV 2025 Workshop held in Hasselt, Belgium, hosted by imec. This renowned annual event brought together over 300 experts from the global photovoltaic community, focusing on the latest advancements in tandem solar technologies.

SITA's presence at the workshop reflected the project’s core mission: advancing stable inorganic tandem solar cells through European scientific leadership and collaborative excellence. Contributions spanned both oral and poster sessions, presenting recent achievements in wide-bandgap materials, device integration, and module design.

Oral Presentations

• Kulwinder Kaur (University of Luxembourg) unveiled new results on Ag-alloyed wide-gap Cu(In,Ga)S₂ absorbers on transparent back contacts [ID 9], highlighting promising advances for highly transparent top cells essential in 2-terminal tandem architectures.

• Thomas Bidaud (CNRS-C2N/IPVF) presented “CIGS tandem on Silicon: an approach to stick around” [ID 47], discussing practical strategies for integrating CIGS layers into silicon-based tandem structures.

Poster Contributions

• Ceren Mitmit (Empa/EPFL) received recognition for her awarded poster on “Understanding and improving Voc in wide bandgap ACIGS solar cells” [ID 58], an area critical for maximising tandem device efficiency.

• Wolfram Witte (ZSW) presented the industrially focused study “Challenges to develop wide-bandgap top cells and modules on transparent back contacts with an industry-relevant Cu(In,Ga)Se₂ process” [ID 20], reinforcing the relevance of SITA’s work for real-world manufacturing.

• Julia Horstmann (Martin-Luther-University Halle-Wittenberg) explored bifacial operation strategies for ACIGSe/Si tandems [ID 72], opening new perspectives on enhanced energy yield.

The diversity and depth of the contributions underline the scientific robustness of the SITA project and its coordinated approach to developing next-generation PV modules with >30% efficiency and long-term durability.