Liquid Crystal Antisolvent Yields Constant Nanocrystals
by Riko Seibo
Tokyo, Japan (SPX) Feb 24, 2025
A analysis crew from POSTECH led by Professors Younger-Ki Kim and Yong-Younger Noh has launched an revolutionary method for fabricating perovskite nanocrystals (PNCs), key semiconductor supplies for next-generation purposes. The brand new methodology achieves outstanding uniformity and effectivity, promising to beat longstanding challenges in typical synthesis and to spice up the commercialization of optoelectronic units corresponding to LEDs and photo voltaic cells.
The investigation was carried out by Professors Younger-Ki Kim and Yong-Younger Noh of the Chemical Engineering Division at POSTECH, in collaboration with Ph.D. candidate Jun-Hyung Im, Dr. Myeonggeun Han of Samsung Electronics, and Dr. Jisoo Hong from Princeton College. Their findings have been printed in ACS Nano, an esteemed worldwide journal within the subject of nanotechnology.
PNCs provide vital potential for superior photo voltaic cells and high-efficiency shows as a result of their tunable mild absorption and emission, which may be exactly adjusted by particle measurement and form via the quantum confinement impact. Conventional strategies like hot-injection and ligand-assisted reprecipitation (LARP) continuously produce particles with inconsistent dimensions due to excessive synthesis temperatures and complex experimental setups. This inconsistency typically necessitates further processing, thereby lowering total productiveness and limiting industrial purposes.
To handle these points, the POSTECH crew has tailored the LARP approach by substituting the standard antisolvent with a liquid crystal (LC). Liquid crystals possess each fluid-like mobility and crystal-like molecular order, aligning alongside a most well-liked path outlined by a director to generate elastic forces. When exterior stress is utilized, these forces reorient the molecules and produce vital elastic strains. By sustaining all different synthesis situations whereas changing the antisolvent with LC, the researchers managed the expansion of PNCs in order that their growth was halted upon reaching the extrapolation size (?) of the liquid crystals, enabling large-scale manufacturing with out extra purification steps.
Additional evaluation revealed that the interplay between ligands connected to the PNC surfaces and the rod-like LC molecules enhances ligand packing. This denser association minimizes floor defects and considerably improves the luminescence properties of the nanocrystals.
Professor Younger-Ki Kim defined, “The synthesis methodology developed by our analysis crew is extremely suitable with present synthesis strategies, corresponding to ligand alternate and microfluidic synthesis, and can improve the efficiency of varied optoelectronic units, together with LEDs, photo voltaic cells, lasers, and photodetectors.” He additionally said, “This know-how permits the large-scale manufacturing of uniform, high-performance nanocrystals at room temperature, and we anticipate it would assist speed up the commercialization of nanocrystal-based optoelectronic units.”
Funding for this analysis was supplied by the Primary Analysis Program (Hanwoomul-Phagi Primary Analysis) and the Pioneer Program for Promising Future Convergence Know-how of the Nationwide Analysis Basis of Korea (NRF).
Analysis Report:Managed Synthesis of Perovskite Nanocrystals at Room Temperature by Liquid Crystalline Templates
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