SKM 2023 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 10: Layer Properties II
DS 10.2: Vortrag
Mittwoch, 29. März 2023, 11:15–11:30, SCH A 316
Perovskite-organic multiple quantum wells towards lasing — •Tobias Antrack1, Martin Kroll1, Markas Sudzius1, Changsoon Cho1, Paulius Imbrasas1, Miguel Albaladejo-Siguan1, Johannes Benduhn1, Lena Merten2, Alexander Hinderhofer2, Frank Schreiber2, Sebastian Reineke1, Yana Vaynzof1, and Karl Leo1 — 1IAPP, TU Dresden, Dresden, Germany — 2Institut für Angewandte Physik, Universität Tübingen, Tübingen, Germany
Metal halide perovskites are of high interest due to their excellent electro-optical properties. Their high damage threshold makes them of special interest for high-fluence applications like lasing devices, and the possibility of production by vacuum deposition is promising for future large-scale industrial production. This technique allows precise thickness control and, therefore, the production of multiple quantum wells (MQWs). Such structures result in high charge carrier concentration and enhanced electron-hole recombination, making them promising for high-performance and fine-tunable materials. This work presents a comprehensive study of the optical properties of vacuum-deposited CsPbBr3 perovskite MQWs with organic (TPBi) barrier layers. Blue shifts in absorption and emission spectra with decreasing well width demonstrate quantum confinement and are confirmed by simulations. Additionally, the photoluminescence quantum yield increases by up to 32 times from bulk material to the thinnest well layers. Amplified spontaneous emission (ASE) measurements show very low thresholds down to 7.3 µJ cm−2 for a perovskite thickness of 8.7 nm, which is significantly lower than previously observed for CsPbBr3 thin films.