Salle de conférences de l’INSP – barre 22-23, 3e étage, salle 317
Andrey L. Rogach – Department of Materials Science and Engineering City University of Hong Kong.
Abstract
Chemically synthesized infrared II-VI nanocrystals, which are best represented by mercury chalcogenide quantum dots [1], are promising light emitting materials which are also important for infrared photodetection [2]. I will introduce some recent synthetic developments on these materials using cation-exchange reactions, which enable efficient shape/phase control leading to the formation of wurtzite HgTe nanorods [3]. Proper choice of ligands on HgTe quantum dots at the synthesis stage obviates the necessity of post-preparative ligand exchange while preserves their intact surface, which is beneficial for infrared photodetectors [4]. Moreover, it is also possible to tailor the infrared emission of HgTe quantum dots through interaction with laser-printed plasmonic arrays [5,6].
References
[1] K. A. Sergeeva, et al.. The Rise of HgTe Colloidal Quantum Dots for Infrared Optoelectronics. Adv. Funct. Mater. 34, 2405307 (2024).[2] Y. Tian, et al.. Mercury Chalcogenide Colloidal Quantum Dots for Infrared Photodetection: from Synthesis to Device Applications. Nanoscale 15, 6476-6504 (2023).
[3] A. S. Portniagin, et al. Cation-Exchange-Derived Wurtzite HgTe Nanorods for Sensitive Photodetection in the Short-Wavelength Infrared Range. Chem. Mater. 35, 5631-5639 (2023).
[4] K. A. Sergeeva, et al.. Obviating Ligand Exchange Preserves the Intact Surface of HgTe Colloidal Quantum Dots and Enhances Performance of Short Wavelength Infrared Photodetectors. Adv. Mater. 36, 2306518 (2024).
[5] A. A. Sergeev, et al.. Tailoring Spontaneous Infrared Emission of HgTe Quantum Dots with Laser-Printed Plasmonic Arrays. Light: Sci. & Applications 9, 16 (2020).
[6] K. A. Sergeeva, et al. Laser-Printed Plasmonic Metasurface Supporting Bound State in the Continuum Enhances and Shapes Infrared Spontaneous Emission of Coupled HgTe Quantum Dots. Adv. Funct. Mater. 2307660 (2023).
