[MOS] MOS Tuesday 26,2013

[Luis H Galindo]

Seminar on




Modern Optics and Spectroscopy

Exciton Fission, Quantum coherence, and
Solar Energy conversion beyond the limit

Xiaoyang Zhu,
Columbia University


Tuesday, February 26, 2013

12:00 – 1:00 p.m.






The maximum solar-to-electric power conversion efficiency of a conventional solar cell is determined by the Shockley-Queisser limit of ~31%. One viable approach to exceed this limit is to create two or more electron-hole pairs from the absorption of one photon in a process called singlet fission or multiple exciton generation. Singlet fission has attracted renewed interest because of the great potential of designing molecules for optimal fission yields. We illustrate how singlet fission occurs in organic semiconductors due to a many electron quantum coherent process and how to efficiently extract two electrons from the quantum coherence. Using model organic semiconductor interfaces, we demonstrate the competitive processes of charge and energy transfer from the singlet, the triplets, and the multi-exciton states. These discoveries are allowing us to formulate design principles for the implementation of singlet fission in solar energy conversion.

Grier Room, MIT Bldg 34-401
Refreshments served after the lecture

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