| AVS 58th Annual International Symposium and Exhibition | |
| Energy Frontiers Focus Topic | Tuesday Sessions |
| Session EN+NS-TuM |
| Session: | Ultrafast Charge and Energy Transfer in Nanomaterials |
| Presenter: | Emily Weiss, Northwestern University |
| Authors: | A. Morris-Cohen, Northwestern University M. Frederick, Northwestern University L. Cass, Northwestern University E.A. Weiss, Northwestern University |
| Correspondent: | Click to Email |
We examine the rates and mechanisms of electron transfer between colloidal semiconductor quantum dots (QDs) and viologen derivatives using ultrafast transient absorption spectroscopy. Viologens accept electrons from photoexcited QDs on the femtosecond-to-single picosecond timescale. Modifications of the chemistry by which the ligands link to the QD surface, and the density of ligands on the QDs, facilitates control of charge separation and recombination rates, and determination of the operative mechanisms of charge transfer.