Device structure engineering of perovskite nanocrystal light emitting diodes

S. M. Pozov^a, M. Athanasiou^b, C. Bernasconi^c, M. I. Bodnarchuk^d, M. V. Kovalenko^c^,^d, G. Itskos^b, S. A. Choulis^a

^aMolecular Electronics and Photonics Research Unit, Department of Mechanical Engineering and Materials Science and Engineering, Cyprus University of Technology, Limassol, 3603, Cyprus

^bDepartment of Physics, Experimental Condensed Matter Physics Laboratory, University of Cyprus, Nicosia 1678, Cyprus

^cInstitute of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, CH-8093 Zürich, Switzerland

^dLaboratory for Thin Films and Photovoltaics, Empa – Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland

Materials for Sustainable Development Conference (MATSUS)
Proceedings of nanoGe Spring Meeting 2022 (NSM22)

#PerNC22. Colloidal Metal Halide Perovskite Nanocrystals: From Synthesis to Applications

Online, Spain, 2022 March 7th - 11th

Organizers: Maksym Kovalenko, Maryna Bodnarchuk and Osman Bakr

, S. M. Pozov, presentation 367
DOI: https://doi.org/10.29363/nanoge.nsm.2022.367
Publication date: 7th February 2022

Lead halide perovskite nanocrystals (NCs) have recently attracted the attention of the research community, due to their excellent optoelectronic properties¹. Colloidal NCs are typically decorated by organic ligands such as long-alkyl-chain ligands to provide colloidal stability and surface passivation, a parameter that affects also crucially the performance of NC optoelectronic devices. However such commonly used ligands do not perform as well in perovskite NCs, resulting in fast ligand desorption and loss of the structural integrity during post synthetic purification and processing steps. As a results new, optimized ligand strategies have been developed for perovskite NCs ². In this work we report on device structure engineering of perovskite NC light emitting diodes (Pe-NCs-LEDs) using active layers of CsPbBr₃ NCs capped with didodecyldimethylammonium bromide (DDAB) and DDAB/PbBr₂. Bottom electrode optimization is performed investigating PVK and Poly-TPD hole injection/transporting layers in normal structure Pe-NCs-LEDs. Additionally, the effect of perovskite NCs ligands, and processing atmosphere are discussed using the best performing Pe-NCs-LED device structure ³. Finally, the functionality of the optimized Pe-NCs-LED device structure is presented using CsPbI₃ and CsPb(Br/Cl)₃ NCs active layers.

References:

[1] Wang, S.; Yousefi Amin, A. A.; Wu, L.; Cao, M.; Zhang, Q.; Ameri, T. Perovskite Nanocrystals: Synthesis, Stability, and Optoelectronic Applications. Small Struct. 2021, 2 (3), 2000124

[2] Manoli, A.; Papagiorgis, P.; Sergides, M.; Bernasconi, C.; Athanasiou, M.; Pozov, S.; Choulis, S. A.; Bodnarchuk, M. I.; Kovalenko, M. V.; Othonos, A.; Itskos, G. Surface Functionalization of CsPbBr3Νanocrystals for Photonic Applications. ACS Appl. Nano Mater. 2021, 4 (5), 5084–5097.

[3] Li, J. et al. 50-Fold EQE Improvement up to 6.27% of Solution-Processed All-Inorganic Perovskite CsPbBr 3 QLEDs via Surface Ligand Density Control. Adv. Mater. 29, (2017).

[4] Hills-Kimball, K.; Yang, H.; Cai, T.; Wang, J.; Chen, O. Recent Advances in Ligand Design and Engineering in Lead Halide Perovskite Nanocrystals. Adv. Sci. 2021, 8 (12), 1–43

Acknowledgements:

This work was financially supported by the Research and Innovation Foundation of Cyprus under the “NEW STRATEGIC INFRASTRUCTURE UNITS-YOUNG SCIENTISTS” Programme (Grant Agreement No. INFRASTRUCTURES/1216/0004”, Acronym “NANOSONICS”).

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