2,2′‐Bipyridyl‐4,4′‐Dicarboxylic Acid Modified Buried Interface of High‐Performance Perovskite Solar Cells

• DOI: 10.1002/ange.202418176
• Publication Date: 2024-10-15T06:03:54Z
• Authors: Mingming Zhao; Wei‐Min Gu; Ke‐Jian Jiang; Xinning Jiao; Kun Gong; Fengzhu Li; Xueqin Zhou; Yanlin Song
• Keywords: Dicarboxylic acid; Interface (matter)

Abstract The regulation of interfaces remains a critical and challenging aspect in the pursuit highly efficient stable perovskite solar cells (PSCs). Here, 2,2′‐bipyridyl‐4,4′‐dicarboxylic acid ( HBPDC ) is incorporated as an interfacial layer between SnO 2 layers PSCs. two carboxylic moieties on bind to through esterification, while its nitrogen atoms, possessing lone electron pairs, interact with uncoordinated lead (Pb 2+ atoms Lewis acid‐base interactions. This dual functionality enables simultaneous passivation surface defects both buried layers. In addition, electron‐deficient nature enhances energy band alignment facilitates transfer from . Furthermore, incorporation strengthens adhesion, improving mechanical reliability. As result, PSCs exhibited impressive power conversion efficiency (PCE) 25.41 % under standard AM 1.5G conditions, along remarkable environmental stability.