Physical Chemistry Seminar: Dr. Sean Roberts, University of Texas-Austin
December 13, 2018 - 01:00 PM - 02:00 PM
Speaker:
Dr. Sean Roberts
Manipulating Energy and Spin for Photon Up- and Down-conversion The negligible spin-orbit coupling in many organic molecules creates opportunities to alter the energy of excited electrons by manipulating their spin. In particular, molecules with a large exchange splitting have garnered interest due to their potential to undergo singlet fission (SF), a process where a molecule in a high-energy spin-singlet state shares its energy with a neighbor, placing both in a low-energy spin-triplet state. When incorporated into photovoltaic and photocatalytic systems, SF can offset losses from carrier thermalization, which account for ~50% of the energy dissipated by these technologies. Likewise, compounds that undergo SF’s inverse, triplet fusion (TF), can be paired with infrared absorbers to create structures that upconvert infrared into visible light. In this presentation, I will review our group’s efforts to create organic:inorganic structures that use SF and TF for improved light harvesting and photon upconversion.
Location:
Carol Lynch Lectrue Hall
Chemistry Complex
Host: Dr. Anna
inquiries rvargas@sas.upenn.edu
Department of Chemistry
231 S. 34 Street, Philadelphia, PA 19104-6323
215.898.8317 voice | 215.573.2112 fax | web@chem.upenn.edu
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