Presentation Information
[8p-E201-9]Multiscale Strategies for Performance Optimization of Tin-Based Perovskite Solar Cells: From Mechanochemical Engineering to Interface and Crystallization Control
〇(DC)Tingting Liu1, Ryosuke Nishikubo1, Chien-Yu Chen2, Atsushi Wakamiya2, Akinori Saeki1 (1.The Univ. of Osaka, 2.Kyoto Univ.)
Keywords:
Tin-Based Perovskite Solar Cells,Lead Free Perovskite Solar Cells,Crystallization Control
Tin-based perovskite solar cells (Sn-PSCs) have emerged as one of the most promising lead-free photovoltaic technologies. However, their performance remains limited by the facile oxidation of Sn2+, high defect densities, and uncontrolled crystallization processes. In this work, a series of multiscale engineering strategies were developed to systematically address these challenges from precursor chemistry to film formation and interface optimization (Figure 1). First, mechanochemical pretreatment of Sn and SnF2 precursors was employed to improve precursor homogeneity and accelerate the reduction of Sn4+, resulting in enhanced film quality and device reproducibility. Subsequently, vacuum-assisted processing combined with interlayer engineering was introduced to mitigate interfacial defects and improve charge extraction across buried interfaces. A 105 °C hot anti-solvent treatment combined with FPEABr pre-passivation effectively regulates crystallization kinetics, reducing energetic disorder while promoting grain growth and crystallinity. Spacer-cation fluorination coupled with a 5 min PASS process facilitates metastable intermediate-phase evolution, balances grain growth and film compactness, and yields dense, highly crystalline films with enhanced Sn2+ stability and device performance. As a result of these sequential optimizations, the power conversion efficiency was increased from 5.24% to 9.13% and 9.29%