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Research Paper

Applied Science and Convergence Technology 2024; 33(3): 62-66

Published online May 30, 2024


Copyright © The Korean Vacuum Society.

Purification of Perovskite Quantum Dots Using the Drop Casting of a Polar Solvent for Memory Devices with Improved Performance and Stability

Aram Leea , Dabin Sonb , Byung Joon Moonb , Minji Kangc , Sukang Baeb , d , Sang Hyun Leee , Tae-Wook Kimd , f , ∗ , and Seoung-Ki Leeg , ∗

aAI Convergence Research Section, Electronics and Telecommunications Research Institute, Honam Research Division, Gwangju 61012, Republic of Korea
bFunctional Composite Materials Research Center, Korea Institute of Science and Technology, Wanju 55324, Republic of Korea
cChemical Materials Solutions Center, Korea Research Institute of Chemical Technology, Daejeon 34114, Republic of Korea
dDepartment of JBNU-KIST Industry-Academia Convergence Research, Jeonbuk National University, Jeonju 54896, Republic of Korea
eSchool of Chemical Engineering, Chonnam National University, Gwangju 61186, Republic of Korea
fDepartment of Flexible and Printable Electronics, Jeonbuk National University, Jeonju 54896, Republic of Korea
gSchool of Materials Science and Engineering, Pusan National University, Busan 46241, Republic of Korea

Correspondence to:twk@jbnu.ac.kr, ifriend@pusan.ac.kr

Received: April 14, 2024; Accepted: April 19, 2024

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (https://creativecommons.org/licenses/by-nc-nd/4.0/) which permits non-commercial use, distribution and reproduction in any medium without alteration, provided that the original work is properly cited.


The evolution of optoelectronic devices has been significantly influenced by the development of metal halide perovskites, particularly all-inorganic cesium lead halide perovskites (CsPbX3, where X is a halide). These materials have several advantageous properties, including long carrier diffusion lengths, high and broad absorption spectra, tunable bandgaps, high carrier mobility, and low-temperature fabrication processes. These qualities make them highly suitable for applications in light-emitting diodes and solar cells. However, the practical application of perovskite quantum dots (QDs) synthesized through the hot-injection method, stabilized by hydrophobic alkyl ligands, is hindered by decreased charge transport characteristics and quantum efficiency due to the insulative nature of the ligands. Innovations to overcome these limitations have included using shorter halide ion pair ligands, such as didodecyl dimethylammonium bromide, and optimizing purification processes to enhance charge injection and maintain stability. We introduced a novel approach for surface ligand engineering through a methanol-based washing process applied during spin-coating, effectively removing excess ligands and residual solvents, and potentially offering a path toward the fabrication of high-performance, low-voltage memory devices using perovskite QDs. This method not only simplifies the purification process but also preserves the photoluminescence, colloidal stability, and structural integrity essential for scalable optoelectronic applications.

Keywords: Perovskite quantum dots, Purification, Optoelectronic devices, Ligand engineering, Photoluminescence

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