Regensburg 2022 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 28: Perovskite and Photovoltaics 3
CPP 28.7: Vortrag
Mittwoch, 7. September 2022, 16:45–17:00, H38
Quantum Efficiency Enhancement of Lead-Halide Perovskite Nanocrystal LEDs by Organic Lithium Salt Treatment — •Roshini Jayabalan1, Tassilo Naujoks1, Christopher Kirsch2, Fengshuo Zu3, Mukundha Mandal4, Jan Wahl2, Martin Waibel1, Andreas Opitz3, Norbert Koch3,5, Denis Andrienko4, Marcus Scheele2, and Wolfgang Brütting1 — 1Universtität Augsburg, 86135 Augsburg, Germany — 2Universität Tübingen, 72076 Tübingen, Germany — 3Institüt für Physik & IRIS Adlershof, Humboldt-Universität zu Berlin, Germany — 4Max Planck Institut für Polymerforschung, 55128 Mainz, Germany — 5Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, 12489 Berlin, Germany
Owing to large specific surface area in lead halide perovskite nanocrystals, surface passivation using ligands is crucial to attain high photoluminescent quantum yield (PLQY). With respect to device fabrication, such passivation methods must also enable balanced charge injection to achieve high efficiency and operational stability. In this regard, this talk will discuss on the results of post-passivation treatment of CsPbBr3 nanocrystals with LiTFSI, an organic lithium salt. The results from such treatment have proven to be propitious for the nanocrystals - yielding higher PLQY, longer exciton lifetime and improved light outcoupling. Consequently, a significant improvement is observed in the devices fabricated using such post post-treated nanoparticles. Lastly, photoelectron spectroscopy and density functional theory modelling is employed to understand the impact of LiTFSI post-treatment on the performance of a perovskite based LED.