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Imaging and Controlling Energy and Charge Transfer in Nanostructured Materials

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Technical Report,15 Dec 2016,14 Jun 2019

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California Institute of Technology Pasadena United States

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This research was focused on the significant improvements in the imaging and temporal resolution made available with the Caltech ultrafast electron microscopy and crystallography set ups developed by Prof. A. Zewail and his team, and on studies of layered e.g. graphene or ordered MoS2 and related chalcogenides, hybrid perovskite materials in particular. In addition to the ultrafast optical pump-electron diffraction probe experiments, we also carried out fs-optical pump-THz absorption and emission experiments using techniques pioneered by Prof. Blakes students over the past few years. The latter have experiments have yielded surprising THz emission strengths from two-dimensional, or layered, organolead halide perovskites, including the n1 version that lacks a center of inversion symmetry. This opens the door to novel studies of patterns films that combine nonlinear optics and solar energy conversion schemes to yield devices with extremely high efficiencies or the possibility of coherent control of the energy flow therein.

Subject Categories:

  • Test Facilities, Equipment and Methods
  • Electricity and Magnetism
  • Atomic and Molecular Physics and Spectroscopy
  • Optics

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