The effect of post synthetic ligand washing on the optoelectronic properties of inorganic and hybrid lead halide perovskite nanocrystals.

Paris Papagiorgis^a, Marios Sergides^b, Andreas Manoli^a, Modestos Athanasiou^a, Caterina Bernasconi^c^,^d, Fedros Galatopoullos^e, Constantinos Nicolaides^f, Epameinondas Leontidis^g, Theodossis Trypiniotis^f, Stelios Choulis^e, Maryna I Bodnarchuk^d, Maksym V. Kovalenko^c^,^d, Andreas Othonos^b, Grigorios Itskos^a

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

^bLaboratory of Ultrafast Science, Department of Physics University of Cyprus, 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, 8600 Dübendorf, Switzerland

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

^fDepartment of Physics, University of Cyprus,, Kallipoleos, 75, Nicosia, Cyprus

^gDepartment of Chemistry University of Cyprus, Kallipoleos, 75, Nicosia, Cyprus

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

Aspects of Emergent Light Emitters:

Limasol, Cyprus, 2022 October 3rd - 5th

Organizers: Maksym Kovalenko, Maryna Bodnarchuk and Grigorios Itskos

Poster, Paris Papagiorgis, 073
Publication date: 15th July 2022

Ligand exchange performed during or after material synthesis provides an efficient route for the electronic functionalization of colloidal nanomaterials for electronic and optoelectronic devices. Herein, we develop a simple post-synthetic process that can produce electronic-active films of all-inorganic and hybrid lead halide perovskite nanocrystals (NCs), namely green-emitting CsPbBr₃ NCs and infrared-emitting FAPbI₃ NCs. We focus on the impact of such functionalization on the morphological, optical, and electrical properties of the treated NC solids while adjusting parameters of the reaction such as the ligand washing exposure time and the processing atmosphere conditions.

Microscopy and spectroscopy unravel the evolution of morphology and photophysics from the nano- to the mesoscopic regime and from isolated NC excitons to electronic and defect transitions of sintered NCs, respectively. As the ligand removal reaction time increases electronic communication improves and the obtained photo-current in simple lateral photoconductive devices increases by up to ~90% and ~60% for the case of FAPbI₃ NCs and CsPbBr₃NCs respectively. THz spectroscopy further supports the photoconductivity findings and produces consistent trends with treatment reaction time in transport and recombination figures of merit such as the real and imaginary conductivity, carrier mobility and auger coefficient.

Acknowledgements:

This work was financially supported by the Research and Innovation Foundation of Cyprus, under the "NEW STRATEGIC INFRASTRUCTURE UNITS-YOUNG SCIENTISTS" Program.

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