Device Performance of CsPbBr3 Perovskite Nanocrystal based Light Emitting Diodes
Sergey Pozov a, Apostolos Ioakeimidis a, Modestos Athanasiou b, Caterina Bernasconi c, Maryna Bodnarchuk d, Maksym Kovalenko c d, Grigorios Itskos b, Stelios Choulis a
a Molecular Electronics and Photonics Research Unit, Department of Mechanical Engineering and Materials Science and Engineering, Cyprus University of Technology, Archiepiskopou Kyprianou, 30, Limassol, Cyprus
b Experimental Condensed Matter Physics Laboratory, Department of Physics, University of Cyprus, Kallipoleos, 75, Nicosia, Cyprus
c Institute of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Hönggerberg, 8093 Zúrich, Suiza, Zúrich, Switzerland
d Laboratory for Thin Films and Photovoltaics, Empa – Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland.
nanoGe Fall Meeting
Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
#OPTONEXT - Next Gen Semiconductors for Optoelectronics
Barcelona, Spain, 2022 October 24th - 28th
Organizers: Paul Shaw and Mike Hambsch
Poster, Apostolos Ioakeimidis, 337
Publication date: 11th July 2022

Lead halide perovskite nanocrystals (NCs) have recently attracted the attention of the research community, due to their excellent optoelectronic properties.[1] 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 result, new, optimized ligand strategies have been developed for perovskite NCs.[2] 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

Acknowledgments: 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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