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How the ionic liquid BMIMBF₄ influences the formation and optoelectronic properties of MAPbI₃ thin films

Title data

Biberger, Simon ; Schötz, Konstantin ; Ramming, Philipp ; Leupold, Nico ; Moos, Ralf ; Köhler, Anna ; Grüninger, Helen ; Panzer, Fabian:
How the ionic liquid BMIMBF₄ influences the formation and optoelectronic properties of MAPbI₃ thin films.
In: Journal of Materials Chemistry A. Vol. 10 (2022) Issue 35 . - pp. 18038-18049.
ISSN 2050-7496
DOI: https://doi.org/10.1039/D2TA04448J

Official URL: Volltext

Abstract in another language

While using additives such as ionic liquids (IL) is known to boost the efficiency and stability of perovskite solar cells, it is still unclear how ILs impact the difficile perovskite film formation process. Here we investigate the impact of the IL BMIMBF4 on the film formation of the model halide perovskite MAPbI3 by multimodal optical in situ spectroscopy during solution processing via one-step spin coating and a solvent engineering approach. One-step processing experiments reveal that IL in the precursor solutions does not affect the formation of perovskite–solvent complexes, but higher IL contents delay the perovskite transformation with decreased growth rates. For solvent engineering, the perovskite growth rate decreases with later anti-solvent (AS) dripping as the properties of PbI42− species in the precursor solutions change during drying. Here the IL also affects the evolution of the PbI42− properties, as the IL cation interacts with the PbI42−. This interaction appears to reduce the perovskite growth rates after initiating perovskite formation by AS dripping. Still, in the as-coated films the IL efficiently passivates defect states. Thus, our work provides important insights into how decisive ILs impact the sensitive interconnection between precursor properties, film formation process and final optoelectronic functionality of perovskite thin films.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics II - Optoelectronics of Soft Matter > Chair Experimental Physics II - Optoelectronics of Soft Matter - Univ.-Prof. Dr. Anna Köhler
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Chemistry III
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 19 Sep 2022 11:32
Last Modified: 19 Sep 2022 11:32
URI: https://eref.uni-bayreuth.de/id/eprint/71882