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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

Abstract:

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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