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Special USTAR Seminar: Jianbo Gao

Jianbo Gao
National Renewable Energy Laboratory

Wednesday November 28, 2012
102 JFB

Title: PbS Quantum Dot Solar Cells--An emerging thin film photovoltaic technology


Semiconductor quantum dots (QDs) play an important role in solar energy conversion, due to their unique new physics that arise from quantum confinement effects such as tunable bandgap as a function of QD size and multiple exciton generation (MEG). The power conversion efficiencies (PCEs) of solar cells using thin, densely packed layers of PbS QDs have increased from 2% just a few years ago to approaching 8% today. Furthermore, when multi-junctions cells stack together, more than 68% PCE can be achieved theoretically. Therefore, the perfect marriage of high efficiency and low cost fabrication makes PbS QDs revolutionary materials for next generation multi-junction solar cells. In this talk, I will focus on the strategies to approach 6% PbS QD solar cells through the fundamental study of device architecture, interface, and PbS QD passivation. Also I will present a recent breakthrough in photovoltaic science that demonstrates MEG in a PbSe QD-based solar cell via the observation of external quantum efficiency (EQE) greater than 100%.

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