我国下一代光伏技术取得新进展，光电转化效率突破30%

Core Insights - The research teams from Nanjing University and the National Defense Science and Technology Innovation Research Institute have made significant advancements in next-generation photovoltaic technology, achieving a breakthrough in the efficiency of all-perovskite tandem solar cells, which now exceeds 30% [1][5] Group 1: Technological Advancements - The newly developed all-perovskite tandem solar cells have achieved a power conversion efficiency of 30.1%, marking the first time this type of solar cell has surpassed the 30% efficiency threshold [5] - The research utilized terahertz technology to enable precise, non-destructive detection of carrier transport within the perovskite solar cells, addressing previous challenges in enhancing efficiency [3][5] Group 2: Research Methodology - The terahertz radiation detection technique developed by the research teams allows for the specific detection of free carrier concentration in perovskite materials without interference from band-to-band transitions [3] - The study identified that the interface between the perovskite light-absorbing layer and the hole transport layer is a significant area for carrier loss, leading to the design of a dipole passivation layer to enhance carrier movement [3][5] Group 3: Experimental Results - The passivation treatment resulted in an increase of over 68% in total carrier mobility and an extension of nearly 30% in carrier diffusion length for the perovskite films [3] - The findings highlight the unique advantages of terahertz spectroscopy in revealing intrinsic physical properties of carriers, providing a new technical pathway for designing efficient materials in the future [5]