Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.102
Publication date: 7th February 2022
Two-dimensional nanoplatelets (NPLs) of II-VI semiconductors exhibit the narrowest optical features among nanocrystals. Despite the great maturity of cadmium based NPLs, their optical properties are limited by the band gap of the bulk material. To push toward infra-red wavelength, mercury-based NPLs are good candidates as they keep narrow optical properties[1].
To obtain such material, only cation exchange is yet available. However, this procedure leads to the creation of structure defects and to the degradation of the optical properties. In this context, we developed an optimized procedure for cation exchange and rationalized the role of the solvent, the temperature and the ligands during this process. This optimized procedure has then been applied to Cd-based alloys of CdSexTe1-x to obtain HgSexTe1-x NPLs of 3MLs with photoluminescence for every composition. Using UV-visible and X-ray spectroscopy, the evolution of the band alignment according to the composition has been established revealing a crossover from n- to p-type behavior as the Te content increases in HgSexTe1-x NPLs. In parallel, this trend has also been observed in time-resolved photoemission measurements.
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