Berlin 2024 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 4: Perovskite and photovoltaics I (joint session HL/KFM)
KFM 4.12: Vortrag
Montag, 18. März 2024, 12:45–13:00, EW 203
Cavity-enhanced absorption measurements of perovskite nanocrystals — •Ines Amersdorffer1, Andreas Singldinger1, Thomas Hümmer1,2, Alexander Urban1, and David Hunger3 — 1Faculty of physics, LMU Munich, Germany — 2Qlibri GmbH, Munich, Germany — 3Physikalisches Institut, KIT, Germany
The search for optimal materials for optoelectronic devices such as solar cells or quantum light emitters has piqued significant interest in perovskite nanocrystals. This is due to their outstanding properties, which range from easy, scalable synthesis at room temperature to ultra-wide colour tunability and high quantum efficiency.
Spectroscopy on single perovskite crystals helps to reveal their excitonic fine structure, which in thin films is concealed by inter-particle phenomena. However, measuring the marginal absorption of such nanocrystals is challenging. One way to overcome this issue is to use an optical resonator in which the light passes through the nanoscale sample multiple times and thereby enhances its absorption to a measurable amount.
To this end, we use a high-finesse microcavity to perform wavelength dependent absorption measurements on perovskite nanocubes. These are complemented by low-temperature photoluminescence and scanning electron microscopy images. The combination of these techniques will provide unprecedented insight into the size- and morphology dependence of the energetic structure of individual nanocrystals. The results show progress towards routine hyperspectral absorption measurements at the nanoscale.
Keywords: absorption; cavity; optical resonator; perovskite nanocrystals; spectroscopy