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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 Duan^1,2,3, Ajay Jha¹, Pabitra Nayak⁴, Michael Thorwart^2,3, Henry Snaith⁴, and R. J. Dwayne Miller^1,3,5 — 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.