Chemistry Department is pleased to host Chemistry and Biochemistry Seminar Series, Tuesday’s at 12:10 pm. Please see Ithaca College Chemistry web page.
https://www.ithaca.edu/academics/school-humanities-and-sciences/chemist…
Guest Speaker Ken Hanson, Ph.D. of Florida State University will be joining us on Tuesday, October 25th in CNS 333 at 12:10 pm will present:
Harnessing Molecular Photon Upconversion Using Self-Assembled Multilayers on Metal Oxide Surfaces
Photon upconversion—combining two or more low energy photons to generate a higher energy excited state—is an intriguing strategy for increasing the maximum theoretical solar cell efficiencies from 33% to greater than 43%. In this presentation we will recount our work using self-assembled multilayers of sensitizer and acceptor molecules on nanocrystalline metal oxide films as a unique structural motif for facilitating molecular photon upconversion via triplet-triplet annihilation (TTA-UC) and directly extracting charge from the upconverted state. Under light intensities as low as ambient solar flux we demonstrate a more than four-fold increase in the short circuit current relative to the sum of the sensitizer and acceptor monolayer devices. We will discuss the dynamics events during TTA-UC, limitations of the current film, and the role of interfacial structure in dictating the performance.