Berlin 2018 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 48: Focus: Fundamental Physics of Perovskites I - organized by Lukas Schmidt-Mende and Vladimir Dyakonov
CPP 48.2: Vortrag
Mittwoch, 14. März 2018, 15:30–15:45, C 130
Observation of coherent phonons upon photo-excitation in lead halide perovskite — •Vandana Tiwari1, Hong-Guang Duan1,2,3, 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
The unprecedented success of hybrid organolead halide perovskites in different cell designs demands the fundamental understanding of underlying microscopic mechanisms for photoinduced charge generation. Electronic dynamics of perovskite upon photo-excitation has provided deep insights into its optoelectronic behavior, but the contribution of lattice vibrations is still to be deciphered. We have employed ultrafast transient grating spectroscopy to probe impulsively excited vibrational modes of CH3NH3PbI3 in thin films. We distinctly observe the ground and excited state vibrational modes at room temperature. The interplay of strongly coupled dominant vibrational modes to ultrafast carrier generation process will be discussed.