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Ultrafast Dynamics Group

Frédéric Laquai's Group
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Facilities

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Electroluminescence Spectroscopy (ELS)

​Electroluminescence spectroscopy (ELS) measures the luminescence emission from a device following charge injection and recombination, for instance, the emission caused by bimolecular recombination of charges in organic solar cells.

Micro-photoluminescence (micro-PL)

Micro-PL refers to spatially-resolved photoluminescence (PL) experiments with a spatial resolution around or better than 1 micrometer.

Transient absorption (TA) pump-probe spectroscopy

TA is a differential pulse technique. A short pulse of white light is transmitted through a photoexcited sample and the transmission of the white light is compared to that of a white light pulse transmitted through a non-excited sample.

Ultrafast THZ Spectroscopy Techniques

We use two techniques of terahertz spectroscopy in order to probe ultrafast photo-initiated dynamics in active materials used in solar cells.

Photo-Induced Absorption Spectroscopy (PIA)

Using PIA, the dynamics of excited states in dyes, polymers and organic devices can be observed, and therefore basic processes like charge separation and recombination can be investigated.

Time Resolved Photoluminescence Spectroscopy (TRPL)

Time resolved photoluminescence spectroscopy probes those excited states that have a radiative decay channel.

Photo-Thermal Deflection Spectroscopy (PDS)

​PDS is a non-destructive and highly-sensitive technique that measures the absorbance of semiconducting materials.

Time-Delayed Collection Field (TDCF)

TDCF is an optical-pump electronic-probe technique, particularly relevant to study the fiel dependance of charge generation, charge exctraction, photogenerated charge density, and charge recombination dynamics in solar cells.

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