Global record set for large triple-junction perovskite solar cell

Australian researchers led by Professor Anita Ho-Baillie at the University of Sydney have developed the largest and most efficient triple-junction perovskite–perovskite–silicon tandem solar cell to date. The team achieved a certified steady-state power conversion efficiency (PCE) of 23.3% on a large 172-square-foot (16-square-meter) device, marking a global record for large-area cells of this type. On a smaller 0.15-square-inch (1 cm²) scale, they reached an even higher efficiency of 27.06%. These results represent significant advancements in both performance and thermal stability, demonstrating the potential for durable, high-efficiency perovskite solar technology. The triple-junction solar cell stacks three semiconductor layers with different bandgaps to capture a broader spectrum of sunlight than traditional silicon cells. The researchers enhanced stability by replacing commonly used but unstable methylammonium with rubidium to strengthen the perovskite crystal lattice and