Fraunhofer has spearheaded a groundbreaking project in the development of a tandem module that revolutionizes the production of solar-generated green hydrogen. The focus of the Neo-PEC joint research project is to create a self-sufficient and reliable system that can play a key role in reducing carbon emissions and transitioning away from fossil fuels. By utilizing solar energy through a photoelectrochemical cell (PEC), the tandem module can split water into hydrogen and oxygen directly, offering a promising alternative to traditional electrolysis processes. The project involved the development of high-purity semiconductor materials and innovative coating methods to enhance hydrogen yield. Dr. Arno Görne highlighted the impact of vapor phase layers on reactor activity and emphasized the efficiency boost provided by integrated photovoltaic elements. The resulting reactor, with an active surface area of half a square meter, can generate over 30 kilograms of hydrogen per year under European conditions, showcasing its potential for efficient energy production. Despite limitations in size due to resistance issues, the module's stability and robustness have proven optimal, allowing for seamless scalability. The successful collaboration among Fraunhofer institutes, each contributing unique expertise, ensured the smooth operation and practicality of the compact power plants. Field tests have validated the reliability of the modules and interconnections, paving the way for future developments in decentralized hydrogen generation and supply. Looking ahead, Fraunhofer plans to continue their interdisciplinary collaboration in upcoming projects and explore further advancements in partnership with the private sector, aiming for direct, safe, and efficient hydrogen production.