南京大学发表最新Nature论文

Core Viewpoint - The research presents a breakthrough in all-perovskite tandem solar cells with a record power conversion efficiency (PCE) of 30.6% through the implementation of a dipolar passivation strategy [3][6]. Group 1: Research Findings - The study developed all-perovskite tandem solar cells utilizing dipolar passivation, achieving a record PCE of 30.6% [3]. - The dipolar passivation strategy effectively reduced the trap density at the buried interface of mixed Pb-Sn perovskite, allowing for precise energy level alignment at the HTL/perovskite interface [5]. - This strategy enhanced Ohmic contact, facilitating efficient hole injection into the HTL while repelling electrons at the HTL/Pb-Sn perovskite interface [5]. Group 2: Performance Metrics - The carrier diffusion length was increased to 6.2 μm, resulting in a significant PCE improvement of the Pb-Sn perovskite solar cell to 24.9%, with an open-circuit voltage (Voc) of 0.911 V, a short-circuit current density (Jsc) of 33.1 mA cm⁻², and a fill factor (FF) of 82.6% [5]. - The dipolar passivation also alleviated contact losses caused by the interconnection layer of the tandem device, pushing the PCE of the all-perovskite tandem solar cell to 30.6%, with a certified steady-state efficiency of 30.1% [6].