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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 28: Poster III
CPP 28.32: Poster
Wednesday, March 20, 2024, 11:30–13:30, Poster C
Influence of unipolar charge carrier injection on lead-halide perovskite nanocrystals — •Roshini Jayabalan1, Wolfgang Brütting1, Theresa Hettinger2, Marcus Scheele2, and Yutaka Noguchi3 — 1Universität Augsburg, 86135 Augsburg, Germany — 2Universität Tübingen, 72076 Tübingen, Germany — 3School of Science and Technology, Meiji University, 214-8571 Kanagawa, Japan
The study on lead halide perovskite nanocrystals (LHP NCs), despite their recent existence, has seen a substantial progress in the research community. Similar to their bulk counterpart, their optical and electrical properties extend to the NCs, with additional advantages including band-gap tuning by size and near unity quantum yield, rendering them as potential emitter material in quantum dot light emitting diodes. With their significantly increased surface area, passivation of surface with appropriate ligands is crucial. While advances in stability and optical properties are outstanding, the electrical accessibility of NCs has gained less attention so far. Efficient electroluminescence relies on a thorough comprehension of the injection of charge carriers into the emitting material. Herein this study, we employ a metal-insulator-semiconductor device structure, with charge selective transport layers to ensure unipolar charge injection (electrons/holes) into the NCs. Finally, we have developed a technique, namely, the displacement current measurenent (DCM) using these devices to understand the electronic properties of LHP NCs films in detail. Trapped charges, injection voltage are identified and carrier specific trends with respect to stabilty are determined.
Keywords: Perovskites; Nanocrystals; Stability; Passivation; Carriers