Controllable synthesis of monodispersed PbS colloidal quantum dots and their size regulation

Yifan Bi; Libin Tang; Liyuan Song; Kar Seng Teng

doi:10.1117/12.3023575

18 March 2024 Controllable synthesis of monodispersed PbS colloidal quantum dots and their size regulation

Yifan Bi, Libin Tang, Liyuan Song, Kar Seng Teng

Proceedings Volume 13104, Advanced Fiber Laser Conference (AFL2023); 131044C (2024) https://doi.org/10.1117/12.3023575
Event: Advanced Fiber Laser Conference (AFL2023), 2023, Shenzhen, China

Abstract

Lead sulfide nanocrystals, also known as lead sulfide colloidal quantum dots (PbS CQDs), have a tunable bandgap, a large exciton Bohr radius and a wide size distribution. The high-quality PbS CQDs have shown excellent photoelectric properties in the field of infrared photodetectors. Monodisperse PbS CQDs can be successfully synthesized by hot injection method in solution, using elemental sulfur and lead oxide as reaction precursors. The synthesized CQDs were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and UV-Vis- NIR spectrophotometer. It is concluded that the PbS CQDs synthesized under the condition of 120°C and 90 min are truncated octahedrons. I- can further passivate the exposed (200) crystal plane when tetrabutylammonium iodide (TBAI) was used for ligand exchange. The prepared CQDs films can be applied to infrared photodetectors and solar cells. Finally, the particle size of CQDs was analyzed by Scherrer formula and the probability statistical model was proposed. The correction coefficient of the particle size of PbS CQDs related to the shape factor was summarized.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yifan Bi, Libin Tang, Liyuan Song, and Kar Seng Teng "Controllable synthesis of monodispersed PbS colloidal quantum dots and their size regulation", Proc. SPIE 13104, Advanced Fiber Laser Conference (AFL2023), 131044C (18 March 2024); https://doi.org/10.1117/12.3023575

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