Lecture V.K. Thorsmolle
|02 February 2011||FWN-Building 5113.0201, Nijenborgh 4, 9747 AG, Groningen|
|Speaker:||Dr. V.K. Thorsmølle|
|Affiliation:||Université de Geneve , Switzerland|
|Title:||Ultrafast dynamics in pentacene|
|Date:||Wed Feb 2, 2011|
|Host:||Paul van Loosdrecht|
|Telephone:||+31 50 363 8149|
Pentacene is a molecular crystal which possesses properties that make it attractive for renewable energy applications such as in organic solar cells. In particular, singlet-to-triplet fission enables multiple exciton generation and the ability to harvest high-energy photons. The extremely low photoluminescence in pentacene indicates the rapid evolution of the initial excited state to a dark state following photoexcitation [1,2]. Here I will present a study of the ultrafast dynamics in pentacene using broadband optical pump-probe spectroscopy focusing on the fission process and its relation to a dark state. Temperature-dependent measurements reveal the nature of the dark state which includes dynamics of biexcitons consisting of paired triplets as well as biradicals.
 V. K. Thorsmølle et al., Phys. Rev. Lett. 102, 017401 (2009).
 P. M. Zimmerman et al., Nature Chem. 2, 648 (2010).
|Last modified:||22 October 2012 2.30 p.m.|