We are interested in understanding photo-induced excitation dynamics in colloidal semiconductor nanocrystals (NCs). These colloidal materials hold tremendous potential for low-cost processing and high-efficiency solar energy conversion. This is due to their size-tunable absorption thresholds and high photo-stability. In addition, some quantum confined NCs display an electron-hole pair generation phenomenon with greater than 100% quantum yield, called “multiple exciton generation” (MEG). These materials could be used to develop solar cells with efficiencies that exceed the 33.7% limiting value for conventional materials.