TERASUN aims to advance technologies for more efficient and cost-effective mass production of c-Si solar cells. By joining the TERASUN Hop On project, FZU brings essential expertise in optical-electrical characterization, significantly enhancing control over light management in advanced light-trapping structures, the uniformity of thin-film layers, and the structural properties of advanced PV devices. FZU’s contribution will focus on developing optical measurement tools to directly assess key solar cell parameters, which will lead to improvements in cell and module conversion efficiencies. These tools will specifically address the homogeneity and structural uniformity of novel light-trapping structures and passivating contacts, with a focus on creating in-line measurement solutions compatible with industrial production. FZU’s specific roles include: (i) Adapting Raman micro-spectroscopy method to evaluate light trapping in c-Si solar cells; (ii) Characterizing nanophotonic structures on module cover glass, focusing on light in-coupling; (iii) Examining contact structures and the uniformity of passivating layers in IBC solar cells. FZU's involvement will elevate TERASUN by introducing innovative, cutting-edge characterization methods, ensuring that the project's technological advancements are not only groundbreaking but also ready for large-scale industrial application.