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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
Start: 15.00
Location: FWN-Building 5113.0201
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.

 [1] V. K. Thorsmølle et al., Phys. Rev. Lett. 102, 017401 (2009).

 [2] P. M. Zimmerman et al., Nature Chem. 2, 648 (2010). 

Last modified:22 October 2012 2.30 p.m.