Other Publications (1)
Articles by Scott Lambright in JoVE
Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids Geoffrey Diederich1, Timothy O'Connor1, Pavel Moroz2,3, Erich Kinder1, Elena Kohn2,3, Dimuthu Perera1, Ryan Lorek1, Scott Lambright1, Martene Imboden3, Mikhail Zamkov1,2 1Department of Physics, Bowling Green State University, 2The Center for Photochemical Sciences, Bowling Green State University, 3Department of Chemistry, Bowling Green State University A general strategy for the development of charge-separating semiconductor nanocrystal composites deployable for solar energy production is presented. We show that assembly of donor-acceptor nanocrystal domains in a single nanoparticle geometry gives rise to a photocatalytic function, while bulk-heterojunctions of donor-acceptor nanocrystal films can be used for photovoltaic energy conversion.
Other articles by Scott Lambright on PubMed
The Effect of the Charge-Separating Interface on Exciton Dynamics in Photocatalytic Colloidal Heteronanocrystals ACS Nano. Aug, 2012 | Pubmed ID: 22881284 Ultrafast transient absorption spectroscopy was used to investigate the nature of photoinduced charge transfer processes taking place in ZnSe/CdS/Pt colloidal heteronanocrystals. These nanoparticles consist of a dot-in-a-rod semiconductor domain (ZnSe/CdS) coupled to a Pt tip. Together the three components are designed to dissociate an electron-hole pair by pinning the hole in the ZnSe domain while allowing the electron to transfer into the Pt tip. Separated charges can then induce a catalytic reaction, such as the light-driven hydrogen production. Present measurements demonstrate that the internal electron-hole separation is fast and results in the localization of both charges in nonadjacent parts of the nanoparticle. In particular, we show that photoinduced holes become confined within the ZnSe domain in less than 2 ps, while electrons take approximately 15 ps to transition into a Pt tip. More importantly, we demonstrate that the presence of the ZnSe dot within the CdS nanorods plays a key role both in enabling photoinduced separation of charges and in suppressing their backward recombination. The implications of the observed exciton dynamics to photocatalytic function of ZnSe/CdS/Pt heteronanocrystals are discussed.