Fraunhofer experts have created a groundbreaking tandem module capable of producing solar-generated green hydrogen with high flexibility and efficiency. The module, developed in the Neo-PEC joint research project, utilizes a unique design that enables the entire electrolysis process to occur within the same unit, ensuring a strict separation between hydrogen and oxygen. By coating glass with semiconducting materials, the module can achieve increased hydrogen yield and high purity. This innovative solution, with a reactor active surface area of half a square meter, has the potential to generate over 30 kilograms of hydrogen per year under European sunlight conditions. The project, a successful collaboration between three Fraunhofer institutes, showcases the expertise in semiconductor materials, large-area coating, and reactor design. With plans for further development and collaboration in the pipeline, Fraunhofer aims to advance the efficient and decentralized generation and supply of hydrogen for various applications. The successful field tests have demonstrated the stability and reliability of the module, paving the way for future advancements in renewable energy technology.