The effect of Hole Injection Layer on the Performance of Perovskite Nanocrystal Light Emitting Diodes

Sergey M. Pozov^a, Apostolos Ioakeimidis^a, Modestos Athanasiou^b, Caterina Bernasconi^d, Maryna I. Bodnarchuk^d, Maksym V. Kovalenko^c^,^d, Gregorios Itskos^b, Stelios 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

^bExperimental Condensed Matter Physics Laboratory, Department of Physics, University of Cyprus, 1678 Nicosia, 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.

Proceedings of International Conference on Emerging Light Emitting Materials (EMLEM22)

Materials for next generation LEDs and lasers:

Limasol, Cyprus, 2022 October 3rd - 5th

Organizers: Maksym Kovalenko, Maryna Bodnarchuk and Grigorios Itskos

Poster, Apostolos Ioakeimidis, 069
Publication date: 15th July 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 NCs². In this work we investigate the effect of hole injection/transporting layers on the performance 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 various hole injection/transporting layers (PEDOT:PSS, PVK, Poly-TPD) 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.

[2] Hills-Kimball, K.; Yang, H.; Cai, T.; Wang, J.; Chen, O.

[3] Manoli, A.; Papagiorgis, P.; Sergides, M.; Bernasconi, C.; Athanasiou, M.; Pozov, S.; Choulis, S. A.; Bodnarchuk, M. I.; Kovalenko, M. V.; Othonos, A.; Itskos

Acknowledgements:

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

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