Jeanne McHale (Washington State University)


Location: Radiation Laboratory Auditorium

"Chromophore Aggregates and Solar Energy Conversion:  Borrowing Ideas from Nature"

Self-assembled porphyrin aggregates studied by resonance Raman spectroscopy and scanning probe microscopy reveal structural features reminiscent of light-harvesting complexes in photosynthetic organisms.  Using polarized resonance Raman and a hierarchal structural model based on images from scanning tunneling microscopy, we account for the optical and electronic properties of helical porphyrin nanotubes.  The potential for chromophore aggregation to enhance the capture of solar energy in dye-sensitized solar photovoltaic cells is considered, and promising affirmative results based on the betalain family of plant pigments are presented.