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Tuning Molecular Singlet Fission – Strong versus Weak Electronic Coupling

Prof. Dirk M. Guldi
Associate Dean for Research – School of Science
Department of Chemistry and Pharmacy
Interdisciplinary Center for Molecular Materials (ICMM)
Friedrich-Alexander-Universitaet Erlangen-Nuernberg, Germany
Email: dirk.guldi@fau.de

Singlet Fission (SF) is a spin-allowed process to convert one singlet excited state into two triplet excited states, namely a correlated triplet pair. The ability to effectively implement SF processes in solar cells could allow for more efficient harvesting of high-energy photons from the solar spectrum and allow for the design of solar cells to circumvent the Shockley-Queisser performance limit. Indeed, several recent studies have demonstrated remarkably efficient solar cell devices based on SF.  The field of molecular SF in pentacene materials lacks a systematic variation / comprehensive understanding of electronic coupling between the individual pentacenes.  By going from a weakly coupled, charge transfer to a strongly coupled, charge separated regime, our ongoing experiments are expected to make significant contributions towards these goals.  In particular, we balance the electronic coupling in pentacene materials to realize quantum yields of 200% and more for intramolecular SF and, subsequent, inter- and intramolecular charge extraction.

Event Details

Date: 11/7/2016 (Monday)
Time: 1:30 pm
Venue: Toxicology Auditorium 2104