我国下一代光伏技术取得新进展！

Core Viewpoint - China's next-generation photovoltaic technology has made significant progress with the development of a perovskite tandem solar cell that achieves a power conversion efficiency of over 30%, as published in the prestigious journal "Nature" [1][5]. Group 1: Technological Advancements - The research teams from Nanjing University and the National Defense Science and Technology Innovation Research Institute utilized terahertz technology to accurately and non-destructively detect the carrier transport behavior within perovskite solar cells [1][3]. - The newly developed non-contact terahertz radiation detection technique effectively addresses the long-standing challenge of improving the power conversion efficiency of perovskite solar cells by allowing precise detection of free carrier concentration without interference from band-to-band transitions [3][5]. Group 2: Experimental Findings - The study identified that the interface between the perovskite light-absorbing layer and the hole transport layer is a significant area for carrier loss. To mitigate this, the researchers designed a dipole passivation layer that facilitates carrier movement towards the hole transport layer [3][5]. - Experimental results indicated that the passivated perovskite films exhibited an increase in total carrier mobility by over 68% and an extension of carrier diffusion length by nearly 30% [3]. Group 3: Recognition and Future Implications - The new perovskite tandem solar cell, certified by an international third-party organization, has achieved a power conversion efficiency of 30.1%, marking the first time this type of cell has surpassed the 30% efficiency threshold, and it has been included in the international "Solar Cell Efficiency Table" [5]. - The research highlights the unique advantages of terahertz spectroscopy in revealing intrinsic physical properties of carriers, providing a new technical pathway for the design of efficient materials in the future [5].