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Researchers at Chonnam National University in South Korea have achieved a power conversion efficiency of 4.81% in tin monosulfide (SnS) solar cells, up from 3.7%, by optimizing charge transport with a germanium oxide layer. Despite the challenges of exceeding 5% efficiency, the improved device maintained over 96% of its initial efficiency after three months, and the team aims to advance SnS technology for practical photovoltaic applications.