Regensburg 2019 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 40: Perovskite and Hybrid Photovolatics I (joint session HL/CPP)
HL 40.4: Vortrag
Donnerstag, 4. April 2019, 10:15–10:30, H36
Ultrafast phonon dynamics in lead halide perovskite — •Hong-Guang Duan1,2,3, Vandana Tiwari1, Ajay Jha1, Pabitra Nayak4, Michael Thorwart2,3, Henry Snaith4, and R. J. Dwayne Miller1,3,5 — 1MPSD, Hamburg, Germany — 2I. Institut für Theoretische Physik, UH, Germany — 3CUI, Hamburg, Germany — 4University of Oxford, UK — 5University of Toronto, Canada
Hybrid organic-inorganic perovskites has gathered much attention owing to their unprecedented success in photovoltaics. To unravel the secrets to this success, we have studied the ultrafast dynamics of lead halide perovskites using heterodyne-detected transient grating and two-dimensional spectroscopy in thin films at room temperature. We distinctly observe the ground and excited state vibrational modes corresponding to organic and inorganic sub-lattices. The interplay of strongly coupled dominant vibrational modes to ultrafast carrier generation process will be discussed. Our experiments also unravel the role of organic cations in the ultrafast dynamics after photoexcitation.