Researchers at the Chinese Academy of Sciences have achieved a world record power conversion efficiency of 28.04% for a tandem solar cell using a wide-bandgap perovskite bottom cell and a narrow-bandgap organic top cell. They utilized a photo-transformable molecule called TDB to improve film uniformity in the perovskite film, leading to enhanced stability and performance. The device demonstrated excellent stability, retaining 90% of its initial efficiency after 625 hours of continuous operation, addressing key challenges associated with morphological instability and performance decay in solar cells. Additionally, the Solar Energy Research Institute of Singapore has achieved a 26.4% efficiency using a new type of organic absorber in the bottom cell, showing promising advancements in tandem solar cell efficiency.