Nanocrystal self-assembly sheds its secrets - A new approach gives a real-time look at how the complex structures form.
March 21, 2016
Four MIT faculty win Presidential Early Career Awards
February 19, 2016
President Obama Honors Extraordinary Early-Career Scientists
February 18, 2016
Zhibo Zhao one of 2015 MRS-Boston best posters winners.
December 3, 2015
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
A. G. Dijkstra, H.-G. Duan, J. Knoester, K. A. Nelson, and Jianshu Cao, "How two-dimensional brick layer J-aggregates differ from linear ones: Excitonic properties and line broadening mechanisms" J. Chem. Phys. 144, 134310 (2016). doi: 10.1063/1.4944980.
September 21, 2016 |
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.