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Carrier Multiplication in Perovskite nanostructures studied by Ultrafast Ultraviolet/visible fluorescence Spectroscopies – CaMPUUS

Carrier Multiplication in Perovskite nanostructures studied by Ultrafast Ultraviolet/visible Spectroscopies

New techniques of time-resolved spectroscopies have to be develop to study the fentosecond dynamics of excitons and charge carriers in hybrid- and hetero-nanostructures.

Direct observation of femtosecond dynamics in perovskite nanostructures

The aim of the CaMPUUS project is double. On the one hand, it is to develop a two-dimensionalspectroscopic technique in the UV/visible range. Only a few such setups exist in the world, and none in France. On the other hand, this new setup, combined with a femtosecond fluorescence technique existing in the host laboratory –fluorescence up-conversion-,<br />will be used to study perovskite materials. The latter are extremely promising materials for photovoltaics but their underlying photophysical properties remain poorly understood, in particular at ultrashort time scales (< 1 ps). The study will focus on multi-exciton generation (MEG) in 2D perovskite nanostructures, process capable of increasing the photocurrent and thus photovoltaic efficiency.

Two-dimensional electronic spectroscopy, femtosecond transient absorption and fluorescence upconversion

Femtosecond transient absorption and 2D electronic spectroscopy under construction.
Fs TA: balanced detection (probe+reference), Narrowband pump from NOPA 1 (visible or UV range). Shot to shot detection at 3 kHz.White light continuum probe. Time resolution about 100 fs and dynamics until about 3 ns.
2DES: two color 2D setup with the two braodband NOPA sources (UV/visible/NIR), heterodynne detection with the triangle geometry, rephasing and non-rephasing signals detected simultaneously.

Study of the ultrafast dynamics of 2D perovskite nanostructures dispersed in solution.

Not yet

The aim of the CaMPUUS project is double. On the one hand, it is to develop a two-dimensional spectroscopic technique based on fluorescence detection. Only a few such setups exist in the world, and none in France. On the other hand, this new setup, combined with another femtosecond fluorescence technique existing in the host laboratory –fluorescence up-conversion-, will be used to study perovskite materials. The latter are extremely promising materials for photovoltaics but their photophysical properties remain poorly understood, in particular at ultrashort time scales (< 1 ps). The study will focus on multi-exciton generation (MEG) in 2D perovskite nanostructures, process capable of increasing the photocurrent and thus photovoltaic efficiency., This ultrafast process can only be properly characterized with the combination of the two fluorescence techniques by enabling direct observation and quantification of MEG.

The candidate, Elsa Cassette, has already acquired a deep know-how in two-dimensional spectroscopy at the Toronto and Princeton Universities. LIDYL-LFP is the ideal place to develop 2D fluorescence spectroscopy, owing to its activities centered on ultrafast laser spectroscopy in the condensed phase and and excited state dynamics. The unique expertise of Elsa Cassette will find a most favorable environment in the host laboratory for the success of this very ambitious project.

Project coordination

Elsa CASSETTE (Laboratoire Interaction, Dynamique et Lasers, UMR 9222)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

LIDyL Laboratoire Interaction, Dynamique et Lasers, UMR 9222

Help of the ANR 399,999 euros
Beginning and duration of the scientific project: March 2016 - 36 Months

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