All-Inorganic CsPbBr3 Perovskite Nanocrystals Synthesized with Olive Oil and Oleylamine at Room Temperature

Getachew Welyab; Mulualem Abebe; Dhakshnamoorthy Mani; Aparna Thankappan; Sabu Thomas; Fekadu Gochole Aga; Jung Yong Kim

doi:10.3390/mi14071332

All-Inorganic CsPbBr₃ Perovskite Nanocrystals Synthesized with Olive Oil and Oleylamine at Room Temperature

Micromachines (Basel). 2023 Jun 29;14(7):1332. doi: 10.3390/mi14071332.

Authors

Getachew Welyab^{1

2}, Mulualem Abebe¹, Dhakshnamoorthy Mani¹, Aparna Thankappan³, Sabu Thomas⁴, Fekadu Gochole Aga^{5

6}, Jung Yong Kim^{5

6}

Affiliations

¹ Faculty of Materials Science and Engineering, Jimma Institute of Technology, Jimma University, Jimma P.O. Box 378, Ethiopia.
² Department of Physics, College of Natural and Computational Science, Mizan-Tepi University, Mizan P.O. Box 260, Ethiopia.
³ Department of Physics, Baselius College, Kottayam 686001, India.
⁴ School of Energy Materials, Mahatma Gandhi University, Kottayam 686560, India.
⁵ Department of Materials Science and Engineering, Adama Science and Technology University, Adama P.O. Box 1888, Ethiopia.
⁶ Center of Advanced Materials Science and Engineering, Adama Science and Technology University, Adama P.O. Box 1888, Ethiopia.

Abstract

Room temperature (RT) synthesis of the ternary cesium lead bromide CsPbBr₃ quantum dots with oleic acid and oleylamine ligands was developed by Zeng and coworkers in 2016. In their works, the supersaturated recrystallization (SR) was adopted as a processing method without requiring inert gas and high-temperature injection. However, the oleic acid ligand for haloplumbate is known to be relatively unstable. Hence, in this work, we employed the eco-friendly olive oil to replace the oleic acid portion for the SR process at RT. Resultantly, we found that the cube-shaped nanocrystal has a size of ~40-42 nm and an optical bandgap of ~2.3 eV independent of the surface ligands, but the photoluminescence lifetime (τ_av) and crystal packing are dependent on the ligand species, e.g., τ_av = 3.228 ns (olive oil and oleylamine; here less ordered) vs. 1.167 ns (oleic acid and oleylamine). Importantly, we explain the SR mechanism from the viewpoint of the classical LaMer model combined with the solvent engineering technique in details.

Keywords: CsPbBr3; LaMer model; ligand; nanocrystals; nucleation and growth; olive oil; perovskite; quantum dot; solvent engineering; supersaturated recrystallization.

Grants and funding

This research received no external funding.