研发成功！我国太阳能电池领域再获重要进展

Core Insights - The research team at the Chinese Academy of Sciences has developed a perovskite solar cell prototype with a power conversion efficiency of 27.2%, marking a significant advancement in the field and laying a crucial foundation for the industrialization of perovskite solar cells [1][4]. Group 1: Research Progress - The efficiency of perovskite solar cells has rapidly increased from an initial 3.8% to over 26% in the past decade, although there is still a gap to the theoretical limit [3]. - The introduction of methylammonium chloride has been pivotal in reducing nucleation barriers and promoting high-quality crystal growth in perovskite thin films [3]. Group 2: Methodology and Results - Researchers identified that chloride ions in methylammonium chloride migrate unevenly during the crystallization process, leading to surface defects and interface electronic barriers that negatively impact cell performance and stability [3]. - A new strategy was proposed to achieve uniform distribution of chloride ions in the vertical direction by introducing alkali metal oxalates during film growth, which effectively suppresses the disordered migration of chloride ions [4]. Group 3: Performance Metrics - The quality of the perovskite thin films was significantly improved, resulting in a carrier lifetime extended to 20 microseconds and a substantial reduction in interface defect density [4]. - The solar cells based on these films maintained 86.3% of their initial efficiency after 1,529 hours of continuous operation and 82.8% after 1,000 hours under accelerated aging conditions at 85°C [4].