Dincă Receives the 2015 Dream Chemistry Award
December 3, 2015
New Perovskite Seminar Series
September 15, 2015
See-Through Solar Is Tomorrow’s Threat to Oil
April 29, 2015
Faculty Highlight: William Tisdale - Understanding and Controlling How Energy Moves
March 23, 2015
MIT Students Bring Nanotechnology to the Masses at Boston’s Museum of Science
March 20, 2015
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
Wu, Mengfei; Congreve, Daniel N.; Wilson, Mark W. B.; Jean, Joel; Geva, Nadav; Welborn, Matthew; Van Voorhis, Troy; Bulovic, Vladimir; Bawendi, Moungi G.; and Baldo, Marc A., "Solid-state infrared-to-visible upconversion sensitized by colloidal nanocrystals" Nat. Photonics, advance online publication, n/a (2015). [DOI: 10.1038/nphoton.2015.226] .
April 5, 2016 | 4:30pm/36-428
Department of Chemical Engineering, The University of Texas at Austin
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.