dr. ir. T.J. Savenije

Tom J. Savenije
Assistant professor
Email:T.J.Savenije@remove-this.tudelft.nl
Address:
Delft University of Technology
Chemical Engineering
Julianalaan 136
2628 BL Delft
The Netherlands
T:+31(0)15 2786537
F:+31(0)15 2787421
Office: 0.208

Research Interests

Exciton transport in thin dye layers .
After absorption of a photon by a dye molecule in a thin film a bound electron-hole pair (exciton) is formed. The diffusion of this neutral species towards a photoactive interface is an essential step in an operative solar cell based on organic materials. Experimental techniques have been developed using a nanosecond tunable laser in combination with time-resolved microwave conductivity techniques to determine the diffusion coefficient and diffusion length. The research provides insight into the relation between the molecular structure and organization and the exciton diffusion.

Photo-induced charge separation at dye/semiconductor interfaces.
The conversion of light into charge carriers is the prime process for solar cells. On excitation of a dye molecule at the interface with a (nanostructured)semiconductor charge separation and eventually charge recombination may occur. The rate constants of these processes are determined by a number of parameters such as the driving force for charge transfer, and the electronic interaction between dye and semiconductor. By determination of the charge separation efficiency and recombination rate using time-resolved photoconductivity measurements these parameters can be quantified. Knowledge of these parameters may serve as a guideline to improve the efficiency of solar cells.

Charge transport properties in thin (in)organic semiconductor layers.
The study of (one-dimensional) charge transport in thin films of new (in)organic semiconductors is of interest in the development of FETs, LEDs and solar cells. To this end films are studied by light induced time-resolved photoconductivity measurements and by light-modulated photoconductivity spectroscopy.

Biography

• 2004-          Deputy Department Head, Opto-electronic materials Section, DelftChemTech, Delft University of Technology
  
• 2002-2004   Assistant Professor, Radiation Chemistry Department, Delft University of Technology
  
• 1997-2002   Post doctoral researcher, Radiation Chemistry Department, Delft University of Technology
  
• 1997-1997   Post doctoral researcher, Inorganic Chemistry, Delft University of Technology
  
• 1992-1997   PhD Student at the Molecular Physics Department, Wageningen Agricultural University.,
  Thesis: “Artificial Photosynthesis: Towards the development of Molecular Photodiodes”, Promoter: Prof Dr T.J. Schaafsma.
  
• 1986-1991   Undergraduate studies, Molecular Sciences, Wageningen Agricultural University.

Selected Publications

• Huijser, A., T.J. Savenije, S.C.J. Meskers, M.J.W. Vermeulen, L.D.A. Siebbeles,  The Mechanism of Long-Range Exciton Diffusion in a Nematically Organized Porphyrin Layer ,  Journal of the American Chemical Society , 130 (2008) 12496-12500
• Huijser, A., B.M.J.M. Suijkerbuijk, R.J.M. Klein Gebbink, T.J. Savenije, L.D.A.Siebbeles,  Efficient Exciton Transport in Layers of Self-Assembled Porphyrin Derivatives,  Journal of the American Chemical Society, 130 (2008) 2485-2492.
• Grzegorczyk, W.J., T.J. Savenije, M. Heeney, S. Tierney, I. McCulloch, S. van Bavel, L.D.A.Siebbeles,  Relationship between film morphology, optical and conductive properties of poly-thienothiophene:PCBM bulk hetrojunction,  Journal of Physical Chemistry C, 112 (2008) 15973-15979.
• Savenije, T.J., A. Huijser, M.J.W. Vermeulen, R. Katoh,  Charge carrier dynamics in TiO2 nanoparticles at various temperatures,  Chemical Physics Letters, 461 (2008) 93-96.
• Grzegorczyk, W.J., T.J. Savenije, J.J.P. Valeton, S. Fratiloiu, F.C. Grozema, D.M. de Leeuw, L.D.A. Siebbeles,  Optical and conductive properties of large-area liquid crystalline monodomains of terthiophene derivatives.  Journal of Physical Chemistry C, 111 (2007) 18411-18416.
• Huijser, A.M., T.J. Savenije, A. Kotlewski, S.J. Picken, L.D.A. Siebbeles,  Efficient light-harvesting layers of homeotropically aligned porphyrin derivatives.  Advanced Materials, 18 (2006) 2234-2239.

1. Kroeze, J.E., R.B.M. Koehorst, and T.J. Savenije, Singlet and triplet exciton diffusion in a self-organizing porphyrin antenna layer.  Advanced Functional Materials, 2004. 14(10): p. 992-998.
   
   Kroeze, J.E., T.J. Savenije, M.J.W. Vermeulen, and J.M. Warman,  Contactless determination of the photoconductivity action spectrum, exciton diffusion length, and charge separation efficiency in polythiophene-sensitized TiO2 bilayers. Journal Of Physical Chemistry B, 2003. 107(31): p. 7696-7705.
   
   Kroeze, J.E., T.J. Savenije, and J.M. Warman, Efficient charge separation in a smooth-TiO2 palladium-porphyrin bilayer via long-distance triplet-state diffusion. Advanced Materials, 2002. 14(23): p. 1760-+.
   
2. Savenije T.J., J.E. Kroeze, X.N. Yang, and J. Loos, The effect of thermal treatment on the morphology and charge carrier dynamics in a polythiophene-fullerene bulk heterojunction. Advanced Functional Materials, 2005. 15(8): p. 1260-1266.
   
   Quist, P.A.C., T.J. Savenije, M.M. Koetse, S.C. Veenstra, J.M. Kroon, and L.D.A. Siebbeles, The effect of annealing on the charge-carrier dynamics in a polymer/polymer bulk heterojunction for photovoltaic applications. Advanced Functional Materials, 2005. 15(3): p. 469-474.
   
   Kroeze, J.E., T.J. Savenije, and J.M. Warman, Electrodeless determination of the trap density, decay kinetics, and charge separation efficiency of dye-sensitized nanocrystalline TiO2. Journal Of The American Chemical Society, 2004. 126(24): p. 7608-7618.
   
   Savenije, T.J., J.E. Kroeze, M.M. Wienk, J.M. Kroon, and J.M. Warman, Mobility and decay kinetics of charge carriers in photoexcited PCBM/PPV blends. Physical Review B, 2004. 69(15).
   
3. Debije, M.G., M.P. de Haas, T.J. Savenije, J.M. Warman, M. Fontana, N. Stutzmann, W.R. Caseri, and P. Smith, Highly anisotropic opto-electronic properties of aligned films of self-assembled platinum molecular wires. Advanced Materials, 2003. 15(11): p. 896-+.
   
   Savenije T.J. and A. Goossens, Hole transport in porphyrin thin films. Physical Review B, 2001. 6411(11).
   

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