Researchers from the University of New South Wales have achieved a new world record efficiency for kesterite solar cells by enhancing them with hydrogen. The team reached an efficiency of 13.2% for high bandgap kesterite cells, which are made of abundant and non-toxic materials like copper, zinc, tin, and sulphur. By addressing defects in the synthesis process through hydrogen annealing, they hope to advance solar photovoltaic technology. Professor Xiaojing Hao and her team believe that CZTS could be the next generation of solar cells, offering a cheaper and greener way to generate electricity. Their breakthrough involves using hydrogen to modulate defects in CZTS, increasing its efficiency in converting sunlight into electricity. The goal is to achieve 15% efficiency within a year and potentially commercialize the technology by 2030. Despite challenges, such as reducing defects during fabrication, CZTS is considered a promising material due to its abundance, environmental friendliness, and optoelectronic properties.