On November 10, a research team headed by Researcher You Jingbi from the Institute of Semiconductors at the Chinese Academy of Sciences, made a substantial breakthrough in the realm of perovskite solar cells. They successfully crafted a prototype perovskite solar cell device boasting a photoelectric conversion efficiency of 27.2%, while also substantially enhancing its operational stability. In this research, they managed to achieve a uniform distribution of chlorine elements within perovskite thin films by introducing alkali metal oxalates. This innovation effectively curbed carrier recombination and interfacial electron barriers. Endorsed by multiple authoritative institutions, the cell retained 86.3% of its initial efficiency after operating continuously under standard sunlight for 1,529 hours. Moreover, it maintained 82.8% of its initial efficiency after functioning for 1,000 hours under accelerated aging conditions involving 85°C photothermal coupling. This accomplishment sets a vital groundwork for the industrial development of perovskite solar cells. The pertinent research findings have been published online in the esteemed journal Science.