Prof. dr. L.D.A. Siebbeles


Laurens D.A. Siebbeles
Full professor 
Email: l.d.a.siebbeles@remove-this.tudelft.nl
Address
:
Chemical Engineering
Delft University of Technology
Van der Maasweg 9
2629 HZ Delft
The Netherlands
T: +31 (0)15 2781800

Office: D1.220 (Building 58)

Research Interests

Research of Laurens Siebbeles focuses on providing understanding of the nature and dynamics of charge carriers and photoexcited states in materials with potential applications in e.g. solar cells, photodiodes, light-emitting diodes, field-effect transistors and nanoscale molecular electronics. Materials of interest include conjugated polymers, molecular materials, semiconductor nanoparticles, and DNA. Charges and excitons are produced by (ultra)short laser or high-energy electron pulses, and detected by time-resolved optical and microwave or terahertz conductivity techniques. The world-wide unique combination of techniques allows us to monitor the formation, mobility and decay of excitons and charge carriers from the sub-picosecond to the millisecond time domain. The experimental research is supported by theoretical calculations of charge and exciton motion. The information obtained about the relation between material structure and the properties of charges and excitons is used to give direction to synthesis of new materials with improved functionality. The research is carried out with numerous academic and industrial (Toyota, Merck UK, BASF) partners that are involved in synthesis, structural characterization or device development.  

Selection of publications in the last five years

  1.  Radiatively dominated charge carrier recombination in black phosphorus
    P. Bhaskar, A.W. Achtstein, M.J.W. Vermeulen and L.D.A. Siebbeles,
    J. Phys. Chem. C.,120, 13836-13842 (2016)
  2.  Hole cooling is much faster than electron cooling in PbSe Quantum Dots
    F.C.M. Spoor, L.T. Kunneman, W.H. Evers, N. Renaud, F.C. Grozema, A.J. Houtepen and L.D.A. Siebbeles
    ACS Nano, 10, 695-703 (2016).
  3.  High charge mobility in two-dimensional percolative networks of PbSe quantum dots connected by atomic bonds
    W.H. Evers, J.M. Schins, M. Aerts, A. Kulkarni, P. Capiod, M. Berthe, B. Grandidier, C. Delerue, H.S.J. van der Zant, C. van Overbeek, J.L. Peters, D. Vanmaekelbergh and L.D.A. Siebbeles
    Nature Commun.,6, Article nr. 8195, doi: 10.1038/ncomms9195, p. 1-8 (2015).
  4.  Carrier multiplication in germanium nanocrystals
    S. Saeed, C. de Weerd, P. Stallinga, F.C.M. Spoor, A.J. Houtepen, L.D.A. Siebbeles and T. Gregorkiewicz
    Light: Science & Applications, 4, e251; doi:10.1038/lsa.2015.24 (2015).
  5.  Generating free charges by carrier multiplication in quantum dots for highly-efficient photovoltaics
    S. ten Cate, C.S.S. Sandeep, Y. Liu, M. Law, S. Kinge, A.J. Houtepen, J.M. Schins and L.D.A. Siebbeles
    Acc. Chem. Res.,48, 174-181 (2015)
  6.  Nature and decay pathways of photoexcited states in CdSe and CdSe/CdS nanoplatelets
    L.T. Kunneman, J.M. Schins,  S. Pedetti,  H. Heuclin, F.C. Grozema, A.J. Houtepen, B. Dubertret and L.D.A. Siebbeles
    Nano Lett., 14, 7039-7045 (2014)
  7.  Long-range orientation and atomic attachment of nanocrystals in 2-D  honeycomb superlattices
    M.P. Boneschanscher, W.H. Evers, J.J. Geuchies, T. Altantzis, B. Goris, F.T. Rabouw, S.A.P. van Rossum, H.S.J. van der Zant, L.D.A. Siebbeles, G. van Tendeloo,
    I. Swart, J. Hilhorst, A.V. Pethukov, S. Bals and D. Vanmaekelbergh
    Science, 344, 1377-1380 (2014).
  8. Highly efficient carrier multiplication in PbS nanosheets
    M. Aerts, T. Bielewicz, C. Klinke, F.C. Grozema, A.J. Houtepen, J.M. Schins and L.D.A. Siebbeles,
    Nature Communications5, 3789 DOI: 10.1038/ncomms4789, 1-5 (2014)
  9. High charge-carrier mobility enables exploitation of carrier multiplication in quantum-dot films
    C.S.S. Sandeep, S. ten Cate, J.M. Schins, T.J. Savenije, Y. Liu, M. Law, S. Kinge, A.J. Houtepen and L.D.A. Siebbeles
    Nature Communications 4, nr. 2360, p. 1-6 (2013)
  10. Disorder strongly enhances Auger recombination in conductive quantum-dot solids
    Y. Gao, C.S.S. Sandeep, J.M. Schins, A.J. Houtepen and L.D.A. Siebbeles
    Nature Communications 4, nr. 2329, p. 1-7 (2013)
  11. Cooling and auger recombination of charges in PbSe nanorods: crossover from cubic to bimolecular decay
    M. Aerts, F.C.M. Spoor, F.C. Grozema, A.J. Houtepen, J.M. Schins and L.D.A. Siebbeles
    Nano Lett. 13, 4380-4386 (2013)
  12. Direct photogeneration of multiple excitons in adjacent silicon nanocrystals revealed by induced absorption
    M.T. Trinh, R. Limpens, W.D.A.M. de Boer, J.M. Schins, L.D.A. Siebbeles and T. Gregorkiewicz
    Nature Photonics
    6, 316-321 (2012).

 

Edited book

Charge and Exciton Transport through Molecular Wires
Eds. L.D.A. Siebbeles and F.C. Grozema
Wiley-VCH, Weinheim, ISBN 978-3-527-31675-5, (2008).  

Curriculum vitae

Born: 12 February 1963, Amsterdam, The Netherlands

Scientific education 

1991

PhD degree, University of Amsterdam
Thesis studies carried out in FOM Institute for Atomic and Molecular Physics (AMOLF) in Amsterdam.
Thesis title: Anisotropy in the photodissociation of H2. Thesis advisor: Prof. Dr. J. Los 

1986

MSc degree Chemistry, Free University Amsterdam
Topics: Photolectron spectroscopy experiments on ionization of small molecules and quantum chemical electronic structure calculations.


Past and present positions

2005-present

Professor and head of section Optoelectronic Materials in Dept. of Chemical Engineering (TU Delft).
Topics: Experiments and theory on excitons and charges in organic materials and colloidal semiconductor quantum dots. 

2011-present

Deputy Head of the Department of Chemical Engineering (TU Delft). 

2001-2005

Professor and head of section Radiation Chemistry in Reactor Institute of TU Delft.
Topics: Experiments and theory on excitons and charges in organic materials and interaction of high-energy radiation (electrons, positrons, muons) with matter. 

2000-2001

Associate professor of Radiation Chemistry in the Reactor Institute of TU Delft. 

1994-2000

Assistant professor of Radiation Chemistry in the Reactor Institute of TU Delft.
Topics: Experiments and theory on excitons and charges in organic materials and interaction of high-energy radiation (electrons, positrons, muons) with matter. 

1994-1994

Postdoc in FOM Institute for Atomic and Molecular Physics (AMOLF, Amsterdam) in group of Prof. Dr. W.J. van der Zande.
Topic: Quantum theory on photodissociation of molecules. 

1991-1994

Postdoc in Laboratoire pour l’Utilisation du Rayonnement Electromagnétique, Université de Paris Sud (Orsay, France) in group of Prof. dr. J.A. Beswick.
Topics: Experiments and quantum theory on photodissociation of molecules.  


Awards

  • VICI grant (2004) in the Innovational Incentives Scheme of The Netherlands Organisation for Scientific Research (NWO); prestigious grant of 1250 kEuro for senior researchers that have demonstrated their ability to develop a new line of research and act as a mentor for young researchers.
  • Young Chemist grant (2002, NWO); grant of 230 kEuro for excellent young chemists to initiate a new research line.
  • Antoni van Leeuwenhoek professorship (2001); honorary early promotion to full professor awarded by TU Delft to excellent, promising young scientists.


Main research activities in the optoelectronic materials group during the past ten years

We have provided understanding of the nature and dynamics of charges and excited states (excitons) in organic materials, semiconductor quantum dots, and DNA. Charges and excitons are produced by (ultrashort) laser or high-energy electron pulses, and detected by time-resolved optical and microwave or THz conductivity techniques. During the past years he installed a picosecond pulsed electron accelerator with funding from an NWO/VICI grant. The combination with time-resolved AC conductivity detection is unique in the world. The experimental research is supported by quantum chemical electronic structure calculations, molecular dynamics simulations and Monte Carlo simulations of charge and exciton motion.

Using the electron accelerator facility the mobility of charges along isolated conjugated polymer chains in dilute solution could be measured. The intrachain charge mobility depends strongly on torsional disorder along a polymer chain. The charge mobility could be enhanced by formation of supramolecular ladder structures to achieve a record intrachain mobility as high as 600 cm2/Vs (Phys. Rev. Lett. 96, 146601, (2006))

We developed a method to calculate electronic couplings involved in charge transport through molecuar materials(J. Chem. Phys. 119, 9809 (2003); Int. Rev. Phys. Chem. 27, 87 (2008)). This method has been implemented in the Amsterdam Density Functional (ADF) program. It was used to provide explanations for measured effects of nucleobase sequence on charge transfer through DNA. One of our papers on this topic (JACS 127, 148094 (2005)) was recognized as a 'hot paper' in terms of immediacy of citations.

In recent years we extended our research to (ultrafast) laser spectroscopic studies on exciton dynamics in semiconductor quantum dots (QDs). Conclusive evidence for the production of two or more excitons by the absorption of a single photon in PbSe QDs has been provided (Nano Lett., 8,1713(2008)). The efficiency of this carrier multiplication (CM) process was an issue of hot debate in the literature, due to its importance for development of highly efficient solar cells. Our recent papers on charge carrier photogeneration and CM in thin films of QDs (Nature Phot. 6, 316 (2012); Nature Nanotech. 6, 733 (2011)) have been highlighted by others in Nature Materials (10, 808, (2011)) and Nature Photonics (6, 272, (2012)).


Selection of invited presentations

  • Dynamics of excitons and charges in organic materials and semiconductor nanocrystals for optoelectronics, Massachusetts Institute for Technology, USA, 5 Dec. 2014
  • Generation and decay dynamics of multiple excitons in colloidal nanosheets,  Intl. Conf. on Quantum Dots (QD2014), Pisa, Italy, 11-16 May 2014.
  • Multiple electron-hole pair generation in PbSe quantum dot films: Effects of inter-dot coupling and temperature,  Gordon Conf. on Clusters, Nanocrystals & Nanostructures, Mount Holyoke, USA, 4-9 Aug. 2013.
  • Breakthrough solar cells,
    Green Aruba Conference 2012, Aruba, 5-7 Oct. 2012.
  • Formation and dynamics of multiple electron-hole pairs in quantum dots,
    Quantsol 2012, Bad Gastein, Austria, 11-16 March 2012.
  • Dynamics of excitons and charges in organic materials and semiconductor quantum dots,
    Materials Research Society Fall Meeting, Boston, 28 Nov. - 2 Dec. 2011.
  • Dynamics of excitons and charges in polymer/fullerene/quantum dot blend films,
    Gordon Conf. on Electronic Processes in Organic Materials, Mount Holyoke, USA, 25-30 July 2010.
  • Interfacial charge generation in polymer/fullerene/quantum dot blend films,
    Gordon Conf. on Radiation Chemistry, Proctor Academy, Andover, USA, 18-23 July 2010.
  • Multiexciton generation and nature of excited states in PbSe quantum dots,
    European Materials Research Society Spring Meeting, Strassbourg, France, 8-12 June 2009.
  • Fundamental studies of charge and exciton dynamics in conjugated organic materials,
    Excited State Processes in Electronic and Bio and Nano-Materials, Santa Fe, NM, USA, 1-4 Oct. 2007.
  • High intra-chain hole mobility on molecular wires of ladder type poly(p-phenylenes),
    Spie Optics and Photonics, San Diego, USA, 13-17 August 2006.
  • Dynamics of charge carriers and excitons in organic materials for opto-electronic applications,
    Gordon Conf. on Electronic Processes in Organic Materials, USA, 25-30 July 2004.

Name author: RA
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