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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 12: Poster 1

CPP 12.45: Poster

Montag, 5. September 2022, 18:00–20:00, P1

Ionic liquids tailoring crystal orientation for stable and high fill factor perovskite solar cells — •Yuqin Zou¹, Lukas V Spanier¹, Julian E Heger¹, Shanshan Yin¹, Christopher R Everett¹, and Peter Müller-Buschbaum Müller-Buschbaum^1,2 — ¹TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching — ²MLZ, TU München, 85748 Garching

Ionic liquids with superior electrical conductivity and thermal stability are used as effective and practical dopants to improve the long-term operation stability and the photovoltaic performance of perovskite solar cells (PSCs). We study different ionic liquids in the perovskite component. Using grazing-incidence wide-angle X-ray scattering (GIWAXS), we discover that the incorporation of ionic liquids is beneficial for obtaining homogeneous spherical nano-particle films and tuning the film crystal orientation. We select 1-butyl-1-methylpyrrolidinium tetrafluoroborate (Pyr13BF4) as the main additive to investigate the charge carrier dynamic behavior of PSCs underdoped with Pyr13BF4 using TRPL, TPC, TPV and OCVD methods. In addition to enhancing the fill factor and optimizing energy level alignment, this additive promotes charge transfer and extraction, reduces the charge carrier accumulation in the bulk, and retards recombination. Under ambient atmosphere, the un-encapsulated PSCs retain 97% of their initial efficiencies for 4368 h.