Awardee: Plant Photovoltaics
Location: Alameda, CA
SubprogramPhotovoltaics
Funding ProgramBridging Research Interactions through Collaborative Development Grants in Energy (BRIDGE)

This project addresses the difficulty of accurately measuring charge carrier dynamics in novel semiconductor materials for thin film photovoltaic cells. We have developed a twophoton lifetime tomography technique to separate bulk minority carrier lifetime from surface recombination effects and effects of recombination at sub-surface defects.This technique also enables us to characterize how local defects such as grain boundaries–buried below the surface of a sample–affect carrier lifetimes in the active layer, dynamics that have been previously inaccessible.