Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.224
Publication date: 7th February 2022
Transition Metal Dichalcogenide (TMDC) monolayers exhibit a direct band gap in their semiconducting crystal phase and have great potential for future photonics through spin- and valleytronics and their ultrafast response to external stimuli, which is essential for fast optoelectronic components [1, 2]. The materials are typically obtained by exfoliation and chemical vapor deposition methods that yield samples of high quality for fundamental research but lack potential scalability. Colloidal wet-chemistry represents a challenging yet promising approach to synthesize TMDCs from precursors in a solution-processed and flexible manner. We show how fundamental properties of MoS2 nanosheets including the layer count, the lateral dimension and the crystal phase is controlled. The initially forming a metallic crystal phase, attractive for catalytic hydrogen evolution, is kinetically preferred and transforms into the thermodynamically stable semiconducting crystal phase throughout the reaction. In order to show that the colloidal approach is able to compete with conventional manufacturing methods we investigate photoluminescence of ultrathin colloidal WS2 nanosheets synthesized with WCl6 and elemental sulfur in oleic acid and oleylamine at 320 °C, finding photoemission for the first time [3]. We observe mono- as well as multilayer photoluminescence exhibiting comparable characteristics to exfoliated TMDC monolayers and underpinning the high quality of colloidal WS2 nanosheets. In addition, the observed monolayer emission has a narrow linewidth, which qualifies colloidal WS2 as a potential single photon emitter complementing epitaxially grown WS2 quantum emitters [4]. Our results render colloidal WS2 as straightforwardly synthesized and highly promising 2D semiconductors with optical properties competitive with conventionally fabricated ultrathin WS2.
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