PbX2 purification: Defect-Engineering Strategy to Achieve Efficient and Stable Blue-, Red-Emitting Perovskite Nanocrystals

ChaeHyun Lee^a, YeJi Shin^a, Alexis Villanueva^b, Samrat Das Adhikari^b, Jhonatan Rodriguez-Pereira^c^,^d, Jan Macak^c^,^d, Camilo Mesa^b, Sixto Giménez^b, Seog Joon Yoon^a, Andres F. Gualdrón-Reyes^b, Iván Mora-Seró^b

^aDepartment of Chemistry, College of Natural Science, Yeungnam University, 280 Daehak-Ro, Gyeongsan, Gyeongbuk 38541, Republic of Korea

^bInstitute of Advanced Materials (INAM), Universitat Jaume I, 12071 Castelló de la Plana, Spain

^cCenter of Materials and Nanotechnologies, Faculty of Chemical Technology, Nam. Cs. Legii 565, Pardubice, Czech Republic

^dCentral European Institute of Technology, Brno University of Technology, Purkyňova, 123, Brno, Czech Republic

Materials for Sustainable Development Conference (MATSUS)
Proceedings of nanoGe Fall Meeting 2021 (NFM21)

#PerNC21. Perovskites II: Synthesis, Characterization, and Properties of Colloidal

Online, Spain, 2021 October 18th - 22nd

Organizers: Maksym Kovalenko, Ivan Infante and Lea Nienhaus

Contributed talk, Andres F. Gualdrón-Reyes, presentation 189
DOI: https://doi.org/10.29363/nanoge.nfm.2021.189
Publication date: 23rd September 2021

Relevant alternatives to decrease the density of surface defects such as ligand passivation, doping, and synthetic protocols have allowed to obtain high-quality perovskite nanocrystals (PNCs). However, the impact of the purity of the precursors involved during the PNCs synthesis to hinder the emergence of defects has not been widely explored. In this work, we analyzed the use of different crystallization processes of PbX₂ to purify the chemicals and produce highly luminescent and stable blue- and red-emitting PNCs. The use of a hydrothermal (Hyd) process to improve the quality of the as-prepared PbCl₂ provides CsPbCl3-xBrx PNCs with efficient ligand surface passivation, maximum PLQY ~88% and improved photocatalytic activity to oxidize organic compounds such as Benzyl alcohol. Then, the hot-recrystallization of PbI₂ prior to Hyd treatment led to the formation of CsPbI3 PNCs with PLQY up to 100%, long-term stability around 4 months under ambient air and relative humidity of 50-60%. Thus, CsPbI₃ LEDs were fabricated to provide a maximum external quantum efficiency up to 13.6%. We claim the improvement of the PbX₂ crystallinity offers a suitable stoichiometry in the PNCs structure, reducing non-radiative carrier traps and so maximizing the radiative recombination dynamics. [1,2] This contribution gives an insight about how the manipulation of the PbX₂ precursor is a profitable and potential alternative to synthesize PNCs with improved photophysical features, by making use of defect-engineering.

References:

[1] Lee, C.; Shin, Y.; Jeon, G. G.; Kang, D.; Jung, J.; Jeon, B.; Park, J.; Kim, J.; Yoon, S. J., Cost-efficient, Effect of Low-Quality PbI2 Purification to Enhance Performances of Perovskite Quantum Dots and Perovskite Solar Cells. Energies 2021, 14

[2] Hassanabadi, E.; Latifi, M.; Gualdrón-Reyes, A. F.; Masi, S.; joon, S. Y.; Poyatos, M.; Julián-López, B.; Mora Seró, I., Ligand & Band Gap Engineering: Tailoring the Protocol Synthesis for Achieving High-Quality CsPbI3 Quantum Dots. Nanoscale 2020, 12, 14194-14203.

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