Research

RESEARCH

Objective

The core of my research involves the control of light-induced ultrafast processes in molecular, inorganic and hybrid complexes with solar energy application. We study both complexes with application in photovoltaics (Figure 1A) and in photocatalysis (Figure 1B). Key targets towards efficient harvesting of sunlight are directional light-induced electron transfer and long-lived charge separation. We study the control and optimization of these processes via:

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tuning the 3D nanostructure of the solar device components, and

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using external stimuli such as plasmonic field enhancements.

Figure 1. Light-induced ultrafast processes in a photovoltaic cell (A) and solar water splitting photoelectrochemical cell (B).

Techniques

The overall efficiency of solar energy devices is determined by many complex processes occurring in a broad time window ranging from femtoseconds to milliseconds. We record a real-time molecular movie of all these processes using advanced complementary spectroscopic techniques such as femtosecond transient absorption, ultrafast x-ray absorption and time-resolved photoluminescence (using streak camera or single photon counting detection). The first and latter methods are present locally, while we perform transient x-ray absorption experiments at external synchrotron and x-ray free electron laser facilities.

Collaborations

In addition to internal collaborations within MESA+, we also collaborate with the following scientists:

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Prof. Tomas Torres, University of Madrid, Spain
http://web.uam.es/gruposinv/ftalo/about.htm

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Prof. Wesley R. Browne, University of Groningen, The Netherlands
http://www.rug.nl/fmns-research/browne/index

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Prof. Joost N.H. Reek, University of Amsterdam, The Netherlands

http://www.homkat.nl/

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Prof. Han Vos, Dublin City University, Ireland
http://www.dcu.ie/chemistry/biographies/han_vos_b.shtml

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Prof. Leticia González, University of Vienna, Austria
http://theochem.univie.ac.at/index.php?id=2

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Prof. Sven Rau, Ulm University, Germany

https://www.uni-ulm.de/en/nawi/nawi-anorg1/staff/ak-rau/

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Dr. Jens Uhlig, Lund University, Sweden
http://www.chemphys.lu.se/

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Dr. Kristoffer Haldrup, DTU Copenhagen, Denmark

http://www.fysik.dtu.dk/