Positional Methylation Isomer Additives Regulate the Degradation Pathway of Perovskites
Abstract
ABSTRACT Multi‐active‐site additives with strong reactivity are an effective strategy to continuously improve device efficiency, and also contribute to the long‐term stability of perovskite solar cells (PSCs). However, achieving efficient interaction between all active sites and the perovskite remains a critical challenge. Among various structural modifications, methyl substitution, the simplest functional unit in organic chemistry, offers a unique methylation effect that strongly depends on its positional configuration within a molecule, thereby providing a promising approach to modulate additive reactivity. In this study, we designed and investigated two positional methylation isomers, 1‐methylhydantoin (1‐MH) and 5‐methylhydantoin (5‐MH), and demonstrate rational positional methylation can significantly enhance the multisite reactivity of additives with perovskite materials. While both isomers contribute to improved device efficiency, they exhibit markedly different effects on device stability. Notably, the incorporation of 5‐MH enabled a power conversion efficiency (PCE) of 26.84% (certified at 26.78%), and delivered outstanding operational stability, retaining 92% of its initial PCE after 2000 h under the ISOS‐L2 protocol.
Article Details
Authors (10)
Zhenda Huang
Key Laboratory of Photovoltaic and Energy Conservation Materials Institute of Solid‐State Physics Hefei Institutes of Physical Science Chinese Academy of Sciences Hefei China
Boyuan Liu
Zheng Liang
Frontiers Science Center for Transformative Molecules, School of Chemistry and Chemical Engineering
Huifen Xu
Key Laboratory of Photovoltaic and Energy Conservation Materials Institute of Solid‐State Physics Hefei Institutes of Physical Science Chinese Academy of Sciences Hefei China
Houwei He
Key Laboratory of Photovoltaic and Energy Conservation Materials Institute of Solid‐State Physics Hefei Institutes of Physical Science Chinese Academy of Sciences Hefei China
Wanting Liu
Hongmin Zhou
Yong Zhang
Jiajiu Ye
Key Laboratory of Photovoltaic and Energy Conservation Materials Institute of Solid‐State Physics Hefei Institutes of Physical Science Chinese Academy of Sciences Hefei China
Xu Pan
School of Integrated Circuits, Harbin Institute of Technology (Shenzhen) 1 , Shenzhen 518055,