Indian scientists at Bengaluru's Centre for Nano and Soft Matter Sciences (CeNS) have achieved a groundbreaking milestone by developing a scalable solar-driven device for affordable green hydrogen production. This innovative device utilizes earth-abundant, low-cost materials to split water molecules and produce green hydrogen using solar energy only, eliminating the need for fossil fuels and expensive components. The device features a unique architecture comprising n-type TiO₂ / intrinsic Si / p-type NiO layers, enabling efficient charge separation and transport. Fabricated using magnetron sputtering, an industry-scalable technique, it has demonstrated impressive technical capabilities such as a 600 mV surface photovoltage, low onset potential, and long-term stability with minimal performance drop over 10 hours of continuous operation. The device has been successfully scaled to a 25 cm² photoanode, showcasing its potential for large-scale hydrogen production. Its advantages include high efficiency conversion, purely solar-driven operation, durability under alkaline conditions, cost-effectiveness, and scalability. This device not only aids in decarbonizing industries by enabling green hydrogen production but also aligns with India's vision for a hydrogen-driven economy, supports net-zero emission goals, and contributes to the global energy transition by offering a clean fuel alternative. With versatile applications ranging from home energy storage to industrial use, this innovative device is a significant step towards achieving sustainable and renewable energy systems across sectors.