The existence of multiexcitons in semiconductor nanocrystals is the central idea which drives the development of nanocrystal lasers, photovoltaics, and non-classical photon sources. In particular, the multiexciton density of states drives one of the most controversial topics in nanocrystal research: multiple exciton generation. Despite intense investigation, any window into the factors which govern the structure of multiexcitons in nanocrystals has remained elusive due to their transient nature. Here we provide the first observation of the transient electronic structure of biexcitons in semiconductor nanocrystals. These experiments unambiguously reveal that the structural dynamics of biexcitons is entirely controlled by the excess energy of the hole, evolving with the relaxation dynamics of the hot hole.

Transient structure of biexcitons in semiconductor nanocrystals is controlled by hot holes

242nd National Meeting (2011)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.