@article{13277,
  author = {Markus Raschke},
  title = {Vibrational Exciton and Polaron Nano-imaging: New Functional Nano-Imaging for Molecular Electronic, Photonic, and Photovoltaic Materials},
  abstract = {<p>Properties and functions of molecular materials often emerge from intermolecular interactions and associated nanoscale structure and morphology. However, conventional microscopy techniques lack sensitivity to the low-energy scales of intermolecular interactions, carrier-phonon coupling, and polaron formation leaving a missing link between material structure and observed heterogeneity in the electronic or photonic response. We address this outstanding problem in several novel combinations of spatio-spectral and spatio-temporal infrared nano-imaging. Through probing vibrational exciton formation as a molecular ruler, we resolve the evolution of defects in growth of competing amorphous and crystalline phases in porphyrin model organic electronic materials. Similarly, imaging intramolecular and intermolecular vibrational coupling in polymers and molecular monolayer, we spatially resolve the molecular level origin of multiscale morphologies. 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, and associated both vibrational and polaron dynamics in ultrafast visible/IR nano-imaging. These nm-ps resolved space-time movies provides for a direct view how the low-energy charge-phonon interactions leads to optoelectronic heterogeneity. 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.</p>
},
  year = {2023},
  journal = {Microscopy and Microanalysis},
  volume = {29},
  number = {Supplement\_1},
  pages = {568-568},
  month = {2023-07},
  publisher = {Oxford University Press (OUP)},
  doi = {10.1093/micmic/ozad067.272},
}