27th Symposium on Photonics and Optics (SPO 2026)

Effect of a cationic surfactant on the formation and optical properties of perovskite quantum dots

Th3.4

5 Nov 2026, 14:35

15m

Online (Zoom)

Oral Sustainable Materials and Technologies for Optoelectronics and Sensors Sustainable Materials and Technologies for Optoelectronics and Sensors

Speaker

Dmytro Haleliuk (Taras Shevchenko National University of Kyiv)

Description

Hybrid organic-inorganic perovskites (HOIPs) have attracted considerable attention in recent years. These materials are characterized by the general formula ABX₃ (where A is an organic cation, B is a metal cation, and X is a halide anion) and exhibit unique semiconducting properties. Driven by extensive research, these compounds have been successfully integrated as active layers in solar cells, light-emitting diodes, lasers, and photodetectors [1]. A highly promising direction in HOIP research focuses on quantum dots (QD) – semiconductor nanoparticles characterized by a high photoluminescence quantum yield and a size-tunable optical bandgap [2].
In this study, MAPbBr₃ (MA = methylammonium) quantum dots were synthesized using varying amounts of a cationic surfactant, cetyltrimethylammonium bromide (CTAB). The synthesis was based on the ligand-assisted reprecipitation method. The photoluminescence and absorption spectra of the synthesized quantum dot colloids were acquired and analyzed. The results revealed that with increasing CTAB concentration, the photoluminescence intensity reaches a maximum at 3.5 equivalents of CTAB, accompanied by a slight widening of the optical bandgap from 2.3 to 2.4 eV.
Furthermore, the morphology of the quantum dot samples was investigated using transmission electron microscopy. Powder X-ray diffraction analysis revealed that an excess of the surfactant leads to the formation of a two-dimensional (2D) perovskite incorporating the CTAB cation. This 2D perovskite was successfully isolated as a single crystal, and its crystal structure was unambiguously determined via single-crystal X-ray diffraction. The presented findings open up new avenues for the application of these nanomaterials in the development of advanced optoelectronic devices.

References
[1] K. Zhou, B. Qi, Z. Liu, X. Wang, Y. Sun and L. Zhang. Advanced Organic–Inorganic Hybrid Materials for Optoelectronic Applications. Adv. Funct. Mater. 2024, 34, 2411671.
[2] D. S. Kreiman, O. I. Kucheriv, L. Baltag, S. Shova and I. A. Gural’skiy. Bandgap Engineering via Halide Mixing in Aziridinium Lead Perovskites: towards Tunable Quantum Dots. Mater. Chem. Front. 2026, 10 (17), 3056–3067.