[2PS-033]
우수논문발표상 응모자Cyclic-Structured Ionic Liquids Enable Highly Stable and Efficient Ambient-Air-Processed Perovskite Solar Cells
발표자차정범 (서울시립대학교)
연구책임자김민 (서울시립대학교)
Abstract
Perovskite solar cells (PSCs) have achieved power conversion efficiency (PCE) over 26% but remain reliant on inert gas condition and toxic anti-solvents, hampering scale-up. In this study, ambient-condition (RH <50%) fabrication of perovskite is reported using ethyl acetate modified with ring-size-tunable N-heterocyclic ammonium ionic liquids (ILs): 1-(2-ethoxyethyl)-1-methylpyrrolidinium (PYR+) and 1-(2-ethoxyethyl)-1-methylpiperidinium (PIP+). Comparative study reveals that the PYR+ cation not only enhances (100) facet orientation but also induces in-plane compressive lattice strain. In-situ GIWAXS under electrical bias and 1-sun illumination demonstrates that addition of IL prevents α to δ phase transitions under operating condition. PSC with PYR+ shows the highest PCE of 24.7% and maintains over 90% of initial PCE after 1000 h of damp-heat stress. These results suggest a strategy for ambient-processed PSCs.