Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.297
Publication date: 18th December 2023
The discovery of the atomically flat two-dimensional cadmium chalcogenide nanoplatelets (NPLs) is considered to be one of the notable milestones in the field of semiconductor nanocrystals, due to their remarkable electronic and optical features and anisotropic shape. One of the important synthetic aspects of such NPLs is the control over their thickness and lateral dimensions, since they determine NPLs’ optical properties and surface area, which, in turn, are crucial parameters for photovoltaic devices. At the same time, despite great progress in new synthesis methods, the production of NPLs with a thickness larger than 5 monolayers (MLs) still remains a challenging task and thus the optical range covered by absorption and emission bands remains limited, which hinders the wider use of planar semiconductor NPLs.
In this work, we demonstrate straightforward methods to prepare six and seven ML-thick zinc-blende CdSe nanoplatelets (NPLs). The synthesized laterally small CdSe NPLs show emission maxima at 582 nm (6 ML) and 596 nm (7 ML), respectively. Moreover, our study shows that CdS crowns can be grown on both six and seven ML-thick CdSe NPLs, as evidenced by the increase of their lateral size and the appearance of new absorption features that correlate with the absorption features of CdS NPLs of the same thickness. Our novel and optimized synthesis procedures and post-synthetic crown growth demonstrate the direct fabrication of 6+ ML thick CdSe NPLs and their core/crown alternatives, allowing for further investigation of these mostly unstudied two-dimensional (2D) nanomaterials.
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