Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.103
Publication date: 22nd December 2022
Lead halide perovskite (LHP) nanocrystals (NCs) have gained research interest due to their exceptional optoelectronic properties including high photoluminescence (PL) quantum yield and narrow PL linewidth suggesting a promising future in light-emitting technologies [1]–[3]. Emission tunability in colloidal LHP NCs can be achieved by either size [4] or compositional modifications [5]. Since the breakthrough of the LHP NCs family, it has been well-established that the NCs΄ emission can be finely tuned covering the whole visible spectrum by controlling the ratio of the halides (Br/Cl) or (Br/I) forming homogeneous alloys. Particularly, the ionic and labile character of the lattice promotes the facile post-synthesis bandgap engineering via partial or full anion exchange from Br- to either Cl- or I- while preserving the NCs’ original morphology and the 3D perovskite structure [6], [7]. In this work, a systematic study of anion exchange reactions on oleate-capped CsPbCl3 colloidal NCs is presented. We will introduce novel insights into selective anion exchange manifested by partial exchange presenting either positive cooperativity (all-or-nothing exchange behavior) or segmented nanoheterostructures. We will also address the kinetics of the reaction by means of in-situ spectroscopy and energy-dispersive X-Ray high-resolution scanning transmission electron microscopy.
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