prof. dr. L.D.A. Siebbeles

Laurens D.A. Siebbeles
Full professor

Address:
DelftChemTech
Delft University of Technology
Julianalaan 136
2628 BL Delft
The Netherlands
Tel. ++31 (0)15 2781800
FAX ++ 31 (0)15 2787421

Office: 0.222

Research Interests

Research of Laurens Siebbeles focuses on the nature and dynamics of charge carriers and excited states in molecular materials with potential applications in e.g. LEDs, solar cells or nanoscale molecular electronics. Materials being studied include (blends of) conjugated polymers, discotic organic materials, inorganic nanoparticles and DNA.

Charge carriers and excitons are produced in these materials by irradiation with high-energy electron or laser pulses, with a duration ranging from the femtosecond to the nanosecond time-domain. Charges and excitons are probed using time-resolved optical detection and microwave or terahertz conductivity measurements. The assignment of a ‘VICI’ research grant from the The Netherlands Organisation of Scientific research (NWO) in 2003 has made it possible to install a new femtosecond laser/electron accelerator facility.

The experimental studies are supported by quantum chemical calculations and Monte Carlo simulations of charge and exciton dynamics.

The most important parameters being studied include: mobility and decay kinetics of charge carriers, optical absorption of charges and excitons, polarizability of excitons, exciton diffusion lengths, dynamics of exciton decay by dissociation into free charges or annihilation.

Biography

1994 - present Staff member at the Delft University of Technology, The Netherlands.
subjects: Nature and dynamics of charge carriers and excitons in nanostructured functional materials for opto-electronics, interaction of high-energy charged particles (electrons, positrons and muons) with condensed matter.
Current position: head of Section Opto-electronic Materials
1994 -1994 Postdoctoral researcher in the FOM-institute for Atomic and Molecular Physics, Amsterdam, The Netherlands.
subject: quantum theory on photofragmentation dynamics.
1991 - 1994 Postdoctoral researcher in the Laboratoire pour l'Utilisation du Rayonnement Electromagnétique, Université de Paris Sud, Orsay, France.
subject: quantum theory and experiments on fragmentation dynamics of electronically excited molecules.
1986 - 1991 PhD student, FOM-institute for Atomic and Molecular Physics, Amsterdam, The Netherlands.
subject: experiments and quantum theory on photodissociation dynamics.
1981 - 1986 Chemistry student, Free University, Amsterdam, The Netherlands.

Date of birth: February 12, 1963

Selected Publications

Photogeneration and ultrafast dynamics of excitons and charges in P3HT/PCBM blends J. Piris, T.E. Dykstra, A.A. Bakulin, P.H.M. van Loosdrecht, W. Knulst, M.T. Trinh, J.M. Schins and L. D.A. Siebbeles, J. Phys. Chem. C, 113, 14500-14506 (2009).
Mechanism of charge transport along Zn-porphyrin based molecular wires
Kocherzhenko A.A. , S. Patwardhan, F.C. Grozema, H.L. Anderson, L.D.A. Siebbeles
Journal of the American Chemical Society, 131 (2009) 5522-5529.
Mechanism of charge transport in self-organising organic materials
Grozema F.C. , L.D.A.Siebbeles
International Reviews in Physical Chemistry, 27 (2008) 87-138.
In spite of recent doubts carrier multiplication does occur in PbSe nanocrystals
Trinh M.T., A.J. Houtepen, Juleon M. Schins, T. Hanrath, J. Piris, W. Knulst, A.P.L.M. Goossens and Laurens D.A. Siebbeles
Nano Letters 8 (2008) 1713-1718.
The mechanism of long range exciton diffusion in a nematically organized porphyrin layer
Huijser A. , T.J. Savenije, S.C.J. Meskers, M.J.W. Vermeulen and L.D.A. Siebbeles,
Journal of the American Chemical Society, 130 (2008) 12496-1250.