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Double-Excitation Dynamics in m-LPPP probed with sub-20 fs Time Resolution

Published online by Cambridge University Press:  15 February 2011

C. Gadermaier ,
G. Cerullo ,
C. Manzoni ,
U. Scherf ,
E.J.W. List  and
G. Lanzani
C. Gadermaier
Affiliation:
Christian-Doppler Laboratory Advanced Functional Materials, Inst. of Solid State Physics, Graz University of Technology, Petersgasse 16, 8010 Graz, and Inst. of Nanostructured Materials and Photonics, Franz-Pichler-Str. 30, 8160 Weiz, Austria
G. Cerullo
Affiliation:
National Laboratory for Ultrafast and Ultraintense Optical Science –INFM, Dipartimento di Fisica, Politecnico di Milano, Piazza L. da Vinci 32, I-20133 Milano, Italy
C. Manzoni
Affiliation:
National Laboratory for Ultrafast and Ultraintense Optical Science –INFM, Dipartimento di Fisica, Politecnico di Milano, Piazza L. da Vinci 32, I-20133 Milano, Italy
U. Scherf
Affiliation:
Department of Chemistry, BUGH Wuppertal, Gauss-Str. 20 D-42097 Wuppertal, Germany.
E.J.W. List
Affiliation:
Christian-Doppler Laboratory Advanced Functional Materials, Inst. of Solid State Physics, Graz University of Technology, Petersgasse 16, 8010 Graz, and Inst. of Nanostructured Materials and Photonics, Franz-Pichler-Str. 30, 8160 Weiz, Austria
G. Lanzani
Affiliation:
National Laboratory for Ultrafast and Ultraintense Optical Science –INFM, Dipartimento di Fisica, Politecnico di Milano, Piazza L. da Vinci 32, I-20133 Milano, Italy
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Abstract

In a novel modification of transient differential transmission spectroscopy, the first excited state S1 is reexcited via a second laser pulse towards a higher lying state Sn. The dynamics of the relaxation of this state Sn as well as the states created from Sn are revealed by a broad-band probe pulse.

We find that the charge carrier generation efficiency from Sn is higher compared to S1. The push and probe durations below 20 fs enable the temporal resolution of the ultrafast relaxation of the Sn state and enables us to identify the two main contributions to enhanced charge generation from Sn, energy migration towards sites of high dissociation probability, and exciton dissociation during vibrational relaxation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 771: Symposium L – Organic and Polymeric Materials and Devices , 2003 , L5.6
Copyright
Copyright © Materials Research Society 2003

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