Thursday, March 21, 2013 — 4:00 PM EDT

Professor Josef Michl
Department of Chemistry and Biochemistry
University of Colorado-Boulder

Abstract

A process in which a singlet excited chromophore transfers some of its energy to a neighboring ground state chromophore, generating two triplet excited chromophores in the end, is called singlet fission. In a solar cell, it would offer a mechanism for using a single photon of sufficient energy to produce two excitations and thus ultimately two electron-hole pairs. If low-energy photons were used by another chromophore to generate a single electron-hole pair, the overall theoretical efficiency would rise from the Shockley-Queisser limit of about 1/3 to nearly 1/2. Efficient singlet fission has however so far been observed only in a handful of organic solids. The talk will outline how the basics of quantum chemistry are being used to look for general design principles for new classes of efficient compounds and will describe their synthesis and photophysics.

Location 
PHY - Physics
150
200 University Avenue West

Waterloo, ON N2L 3G1
Canada

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