Reducing nonradiative recombination for highly efficient inverted perovskite solar cells via a synergistic bimolecular interface

作者：Shaobing Xiong, Fuyu Tian, Feng Wang, Aiping Cao, Zeng Chen, Sheng Jiang, Di Li, Bin Xu, Hongbo Wu, Yefan Zhang, Hongwei Qiao, Zaifei Ma, Jianxin Tang, Haiming Zhu, Ye‐Feng Yao, Xianjie Liu, Lijun Zhang, Zhenrong Sun, Mats Fahlman, Junhao Chu, Feng wei Gao, Qinye Bao · 发表于：Nature Communications · 年份：2024 · DOI：10.1038/s41467-024-50019-3 · 被引用次数：215 · 研究领域：Perovskite Materials and Applications、Quantum Dots Synthesis And Properties、Conducting polymers and applications

Abstract Reducing interface nonradiative recombination is important for realizing highly efficient perovskite solar cells. In this work, we develop a synergistic bimolecular interlayer (SBI) strategy via 4-methoxyphenylphosphonic acid (MPA) and 2-phenylethylammonium iodide (PEAI) to functionalize the perovskite interface. MPA induces an in-situ chemical reaction at the perovskite surface via forming strong P-O-Pb covalent bonds that diminish the surface defect density and upshift the surface Fermi level. PEAI further creates an additional negative surface dipole so that a more n-type perovskite surface is constructed, which enhances electron extraction at the top interface. With this cooperative surface treatment, we greatly minimize interface nonradiative recombination through both enhanced defect passivation and improved energetics. The resulting p-i-n device achieves a stabilized power conversion efficiency of 25.53% and one of the smallest nonradiative recombination induced Voc loss of only 59 mV reported to date. We also obtain a certified efficiency of 25.05%. This work sheds light on the synergistic interface engineering for further improvement of perovskite solar cells.