Vibrational exciton and polaron nano-imaging: a molecular ruler to image structure, coupling, and disorder in functional molecular materials
- PC Department Online Seminar
- Date: Oct 14, 2021
- Time: 02:00 PM (Local Time Germany)
- Speaker: Prof. Markus Raschke
- University of Colorado at Boulder
- Host: Melanie Müller

Through probing vibrational exciton formation as a molecular ruler, we resolve the evolution of defects in organic electronic materials and nano-domains in self-assembled monolayer on molecular length scales [1,2]. In the extension to probing both electronic and lattice degrees of freedom, in organic-inorganic perovskites we image the elementary processes of heterogeneous cation-lattice coupling that control the photovoltaic response [3]. We further demonstrate through Purcell-enhanced and strongly coupled light matter interaction the emergence of new hybrid light-matter state and their control for nano-metrology and -sensing [4]. As a perspective we show how electronic, vibrational, and polaron quantum state nano-spectroscopy in the low energy landscape of molecular matter provides for functional imaging as a new tool to guide the molecular device fabrication with improved performance.[1] T. P. Gray, J. Nishida, S. C. Johnson, and M. B. Raschke, “2D Vibrational exciton nanoimaging of domain formation in self-assembled monolayers”, Nano Lett. 21, 5754 (2021).[2] E. A. Muller, T. P. Gray, Z. Zhou, X. Cheng, O. Khatib, H. A. Bechtel, and M. B. Raschke, “Vibrational exciton nanoimaging of phases and domains in porphyrin nanocrystals”, PNAS 117, 7030 (2020).[3] J. Nishida, A. H. Alfaifi, T. G. Gray, S. E. Shaheen, and M. B. Raschke, “Heterogeneous cation-lattice interaction and dynamics in triple-cation perovskites revealed by infrared nanoscopy”, ACS Energy Letters. 5, 1636 (2020).[4] B. Metzger, E. Muller, J. Nishida, B. Pollard, M. Hentschel, and M. B. Raschke, “Purcell- enhanced spontaneous emission of molecular vibrations” Phys. Rev. Lett. 123, 153001 (2019).
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