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https://hdl.handle.net/11147/14409
Title: | Ligand engineering for improving the stability and optical properties of CsPbI3 perovskite nanocrystals | Authors: | Yuce Cakir,H. Yalcinkaya,Y. Demir,M.M. |
Keywords: | CsPbI<sub>3</sub> nanocrystals Ligand engineering Perovskite Stability |
Publisher: | Elsevier B.V. | Abstract: | Inorganic lead halide perovskite nanocrystals (NCs) have recently become one of the research topics for optoelectronic applications due to their excellent photophysical properties. Despite their notable thermal stability over organic-inorganic halide perovskites, CsPbI3 NCs suffer from the phase instability of α-CsPbI3 phase at room temperature and under ambient conditions. Here, the effects of 4-Hydroxybenzoic acid (4-HBA) as an additive to standard oleic acid – oleylamine pair on the stability and optical properties of CsPbI3 perovskite NCs are discussed. 4-HBA addition into perovskite NC systems causes a compressive strain on perovskite lattice, which leads to the formation of a mixed phase α- and γ-CsPbI3 phases while pristine perovskite has α-CsPbI3 phase. Time-dependent stability of the perovskite NCs was tested under an ethanol (EtOH) medium. After EtOH exposure of the perovskite NCs, CsPbI3 NCs transformed to non-perovskite phase in 1 h while 4-HBA added CsPbI3 NCs still have perovskite phase after 48 h. In addition to the improved optical properties of the perovskite NCs, 4-HBA addition remarkably improves CsPbI3 perovskite stability. © 2024 Elsevier B.V. | URI: | https://doi.org/10.1016/j.optmat.2024.115420 https://hdl.handle.net/11147/14409 |
ISSN: | 0925-3467 |
Appears in Collections: | Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection |
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