Core Insights - The research team from the Qingdao Institute of Bioenergy and Process Research, Chinese Academy of Sciences, has achieved over 15% photoelectric conversion efficiency in a new type of solar cell material, certified by an international authority [3][4] - The core material, Copper Zinc Tin Sulfide Selenide (CZTSSe), is abundant, low-cost, and environmentally friendly, making it a promising candidate for next-generation solar technology [3][4] Material Characteristics - CZTSSe is derived from widely available elements, does not rely on rare metals, and has low material costs due to its solution-based preparation method [3] - The thin-film nature of the battery reduces material usage, and it is safe and non-toxic, suitable for large-scale applications [3] Technical Challenges and Solutions - A significant challenge has been the migration of metal ions during high-temperature preparation, which affects the stability and performance of the solar cells [3] - The introduction of a "interface phase" structure, Li2SnS3, acts as a guide for metal ions, improving the uniformity and stability of the crystal structure [4] Performance Improvements - The new method has led to a photoelectric conversion efficiency of 15.45% and an internationally certified efficiency of 15.04% [4] - The open-circuit voltage has surpassed 600mV for the first time under narrow bandgap conditions, addressing performance bottlenecks in this type of photovoltaic device [4] Future Implications - The research provides a systematic explanation of the relationship between ion migration, defects, and performance, laying a solid foundation for future industrial applications [4] - With the acceleration of global energy transition, this achievement is expected to play a significant role in future clean energy systems, contributing to green and low-carbon development [4]