A team of Indian scientists from the Centre for Nano and Soft Matter Sciences (CeNS) in Bengaluru has made a significant breakthrough by developing a scalable next-generation device for green hydrogen production. Green hydrogen is highlighted as a clean fuel that can decarbonize industries, power vehicles, and store renewable energy. This innovation by the CeNS team involves the use of solar energy and earth-abundant materials to produce green hydrogen without the need for fossil fuels or expensive resources. The device, as described in the Journal of Materials Chemistry A, features a state-of-the-art silicon-based photoanode with a unique heterojunction architecture, enabling enhanced charge separation and transport efficiency. The materials were carefully deposited using a scalable and efficient technique, magnetron sputtering. The device exhibited high efficiency, exceptional stability, and successful performance at a large scale, showcasing its potential for widespread application in solar-to-hydrogen energy systems. This breakthrough signifies a step towards affordable and large-scale solar-to-hydrogen energy systems, offering a promising solution for a sustainable future powered by green hydrogen.