Innovative scientists from Kunming University of Science and Technology have pioneered a new grain boundary stabilization technique, triumphantly surmounting the hurdles of efficiency and stability in perovskite solar cells. This pioneering approach incorporates iodine-containing organic molecules into the perovskite precursor solution, fostering the formation of stable compounds that effectively mitigate grain boundary defects, resulting in a substantial boost in battery performance. Experimental results reveal that the efficiency of the 1.66 electron volt battery soars to 24.12%, while the 1.53 electron volt battery achieves an impressive efficiency of 26.84%. Notably, these batteries maintain their high efficiency even after enduring prolonged operation and high-temperature aging tests, showcasing remarkable stability. This seminal breakthrough firmly establishes the groundwork for the commercial deployment of perovskite solar cells.