Presentation Information
[25a-22C-6]Enhancing the Power Conversion Efficiency of Perovskite Solar Cells through a Chelating Molecules-Based Strategy
〇(M1)HongYi Lin1, KaiChi Hsiao1, TingHan Lin1, MingChung Wu1 (1.Chang Gung Univ.)
Keywords:
Perovskite solar cells,Chelating molecular,Interlayer passivation
Perovskite solar cells (PSCs) have gained significant attention in photovoltaic research owing to their remarkable power conversion efficiency. Typically, perovskite films are produced using the spin coating method. However, the fluid dynamics during this process can lead to an uneven distribution of the precursor components and a disordered orientation of grains within the perovskite film. Various charged defects, such as vacancies, anti-sites, and interstitial defects, are also generated in the film simultaneously. In this study, we used the chelating molecules incorporation strategy to passivate defects at the interface between perovskite and the SnO2 electron transport layer. Three types of chelating molecules including 2-Aminoethylphosphonic acid (APA), 6-Mercaptopyridine-3-carboxylic acid (MCPA), and 3-Mercaptopropionic acid (MPA), were spin-coated onto SnO2 electron transport as interlayer. X-ray diffraction analysis of three different chelating molecules revealed that the incorporation of APA promotes the formation of perovskite structures, with a corresponding decrease in the intensity of undesirable PbI2 peaks as APA concentration increases. The morphological and topological analysis of the perovskite film, conducted using SEM and AFM, revealed that the film with 3mM APA exhibited a relatively smooth surface and larger grains. These phenomena are likely attributable to the interaction between phosphate and amine groups with uncoordinated PbI2, resulting in a modified interface. Besides, the inhibiting the formation of uncoordinated PbI2 reduced the defect density in perovskite active layer, facilitating the electron transfer. As a result, the PSCs with APA interlayer exhibited the highest power conversion efficiency, reaching 21.85%.