An international research team has developed an indium-free perovskite-silicon tandem solar cell using tin oxide films and a low-damage reactive plasma deposition process, resulting in high efficiency and stability. Published in Science, the research showcases the potential for reducing material costs while maintaining strong performance under various conditions. This breakthrough could lead to low-cost, sustainable, and scalable photovoltaic technologies on a terawatt scale, offering promising solutions for addressing climate change.