Berlin 2018 – scientific programme
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DS: Fachverband Dünne Schichten
DS 33: New Twists for Nanoquakes on a Chip - Emerging Applications of Surface Acoustic Waves in Condensed Matter Physics (Focussed Session): Session II
DS 33.3: Talk
Thursday, March 15, 2018, 15:30–15:45, H 2032
Sub-decay time control of the optical emission of lead halide perovskite nanowires at room temperature — •Lisa Janker1, Lakshminarayana Polavarapu2, Yu Tong2, Alexander S. Urban2, Jochen Feldmann2, and Hubert J. Krenner1 — 1Experimentalphysik 1, Universität Augsburg — 2Photonics and Optics Group, LMU München
The outstanding, composition-tunable optical properties of hybrid halide perovskites sparked extensive research effort worldwide leading to optoelectronic applications for photovoltaics, light emission and detectors. While most breakthrough studies focused on thin films, very recently, perovskite nanocrystals, platelets and nanowires (NWs) have been synthesized enabling size-tuning of the optical properties.
Here we report on the dynamic modulation of optical emission of CsPbI3 NWs by a piezoelectric surface acoustic wave (SAW). SAWs have found various applications to probe and manipulate nanosystems at radio frequencies, e.g. to determine the mobilities in III-V semiconductor NWs.
We compare PL-transients recorded from a bundle of NWs without and with a SAW interacting with the NWs. Our experimental data clearly demonstrates that the PL-decay is periodically modulated in time by the SAW. Most strikingly, the period of this modulation is precisely 1/2 TSAW. The doubling of the modulation frequency points towards a field-induced displacement of the electron and hole forming an exciton. Such an electric field-driven nature of our approach promises deeper insight into excitonic properties of perovskite nanowires.