Over the past five years, six Fraunhofer Institutes collaborated on the "MaNiTU" project to advance perovskite-silicon tandem solar cells for industrial use. The German-based team developed scalable processes, achieving 31.6% efficiency on a 1 cm² tandem cell with a hybrid deposition method. Larger demonstrators over 100 cm² were produced with screen-printed metallization. To address temperature sensitivity, a process chain using SALD hybrid systems (ALD, evaporation, and sputtering) was implemented, keeping production below 100°C. New contact materials were designed for G12 wafers, enhancing performance. While lead-free perovskites were explored, they lacked sufficient efficiency. The project also developed recycling methods for lead-based perovskites to support a circular economy. Advanced analysis techniques like TEM and focused ion beam (FIB) characterized cell microstructures and interfaces can achieve a theoretical efficiency limit of 39.5%, says Fraunhofer.