Green hydrogen is promising to decarbonize the energy, transportation and industry sectors to counter the climate crisis. But the levelized cost of any form of green hydrogen must be competitive with steam methane reforming at $2.5/kg. Recently, a cheap yet powerful water splitting device has been assembled in Germany. In the device, a triple-junction thin-film a-Si:H/a-Si:H/μc-Si:H photovoltaic modules are directly coupled to an anion exchange membrane of an alkaline water electrolysis cell. A scale-up demonstration showed the solar-to-hydrogen efficiency exceeding 10% at a 10 m2 scale, and less than 10% activity decrease in a 9-month test. See full story at Advanced Science News.