Researchers from China's Jiangsu University, Zhejiang Institute of Quality Sciences and Tianjin University have developed an additive-engineering strategy combined with polymer encapsulation to significantly improve the performance and stability of lead-free CsSnI 3 perovskite photodetectors. Tin-based perovskites such as CsSnI 3 are considered strong candidates to replace lead-based materials due to their lower toxicity, cost advantages, and favorable optoelectronic properties, including tunabl