講演情報
[8p-E201-8]Effect of Binary Metal Fluoride in Tin Perovskite Solar Cells
〇DHRUBA B KHADKA1, Aman Shukla1,2, Mai Otake3, Masatoshi Yanagida1, Koichi Yamashita3, Azusa Muraoka3, Yasihiro Shirai1 (1.NIMS, 2.IIT, 3.Japan Women Univ.)
キーワード：
Perovskite Solar cells、Functional Additive、PhotoPhysics
TTin-based perovskite solar cells (Sn-PSCs) offer a promising lead-free alternative for photovoltaic applications. However, their performance is limited by Sn2+ oxidation, high defect density, and severe self-p-doping. This work investigates the effect of binary metal fluoride-based additive (BaF2, SrF2, and YbF3) engineering to regulate the crystallization, defect chemistry, and electronic structure of FASnI3 perovskites. Among the investigated additives, SrF2 achieved the best device performance ~12.6%, together with enhanced operational stability. Density functional theory calculations revealed that all additives suppress Sn off-centering and reduce electron effective-mass anisotropy, although their structural and electronic influences differ considerably. This work highlights the effectiveness of fluoride additives, which originates from the interplay between defect energetics and octahedral distortion, providing a guideline for the design of efficient and stable lead-free PSCs.