Dresden 2026 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
HL: Fachverband Halbleiterphysik
HL 45: Perovskite and Photovoltaics: Spectroscopy
HL 45.4: Talk
Thursday, March 12, 2026, 15:45–16:00, POT/0006
Nano-sensing of AC-Fields with Perovskite Quantum Dots and Electro-Switching of Luminescence — •Emanuel Eckl1, Fabian Brütting1, Moritz B. Heindl1, Maryna Bodnarchuk2, Mariia Svyrydenko2, Maksym Kovalenko2, and Georg Herink1 — 1University of Bayreuth, Bayreuth, Germany — 2ETH Zürich, Zürich, Switzerland
Perovskite quantum dots (PQDs) currently attract significant research interest, particularly owing to their broad tunability of optoelectronic properties with applications in energy conversion, solid-state lighting and sensing technologies.
In this study, we investigate the potential of PQDs as nano-sensors for transient electric fields up to multi-Terahertz (THz) frequencies [1]. Combining electro-absorption, lifetime and photoluminescence measurements of inorganic and hybrid lead-halide PQDs, we demonstrate a massive electro-switching effect observed via luminescence. The emission modulation is directly correlated with reduced photoluminescence lifetimes and can be attributed to a switching of radiative quantum efficiency. Furthermore, we present evidence for a memory effect that exhibits significantly delayed responses in comparison to the well-understood quasi-instantaneous Quantum-Confined Stark Effect that is also observable in these PQDs. In particular, the Stark effect is utilized for the purpose of validating and comparing our measurements to those of conventional inorganic CdSe QDs, previously employed in ultrafast imaging of THz near-fields.
[1] M.B. Heindl, et al., Light Sci Appl 11, 5 (2022).
Keywords: Perovskites; Quantum Dots; Field-Sensing; Stark Effect; Photoluminescence