MIT Deshpande Center Announces Fall 2014 Research Grants
October 8, 2014
Material gain: Research a step toward more efficient solar panels
October 7, 2014
Developing new light and energy technologies
August 20, 2014
Nano-Structured Solar Cells
August 11, 2014
Energy and Sustainable Chemistry: Light Harvesting & Biocatalysis
July 14, 2014
ChemE's Tisdale receives Baker Award for undergraduate teaching
May 21, 2014
Getting More Electricity Out of Solar Cells - MIT News
May 7, 2014
Excitons observed in action for the first time
April 16, 2014
Ferry Prins, Aaron J. Goodman, and William A. Tisdale, "Reduced Dielectric Screening and Enhanced Energy Transfer in Single- and Few-Layer MoS2" Nano Lett., Article ASAP, DOI: 10.1021/nl5019386, online October 7, 2014.
January 15, 2015 | 3:30pm/ 4-270
What is an Exciton?
When a chlorophyll molecule in the leaf of a plant absorbs a photon of sunlight, the solar energy is converted into an excited state of the molecule known as an exciton. The exciton then transports the energy between molecules in the leaf, and ultimately mediates the conversion of sunlight into electrical energy.
Thus, excitons are packets of energy confined within a material. They are the crucial intermediate for energy transduction in all kinds of low-cost electronic materials. Excitons also dominate the behavior of disordered synthetic nano-materials like polymers and inorganic quantum dots. Consequently, excitons control solar energy conversion in low-cost solar cells, and also light emission in organic and quantum-dot based LEDs.