Seminar: Edward Sargent, University of Toronto
Professor Edward Sargent of University of Toronto, presents a seminar in Chemical & Biomolecular Engineering, "Optoelectronic devices based on colloidal quantum dot solids."
Abstract: Solution-processed photovoltaics offer a cost-effective path to harvesting the abundant resource that is solar energy. The organic and polymer semiconductors at the heart of these devices generally absorb visible light; however, half of the Sun’s power reaching the Earth’s surface lies in the infrared.
Flexible solar cells that harvest wavelengths beyond 1 μm were first reported in 2005, and were based on the application of quantum-size-effect-tuned infrared-bandgap colloidal quantum dots. Since then, we have reported certified solar power conversion efficiencies exceeding 7%. Recent advances of interest include all-quantum-tuned tandem solar cells; and the emergence of all-inorganic colloidal quantum dot materials that use halide anions, instead of conventional organic ligands, for passivation.
Professor Sargent will summarize advances in the materials chemistry, fabrication, physical understanding, and performance-oriented engineering of colloidal quantum dot solar cells and light sensors.