Publications de Jelissa Risse | EPFL Graph Search

Dynamics of Photocarrier Separation in MAPbI3 Perovskite Multigrain Films under a Quasistatic Electric Field

Jacques-Edouard Moser, Joël Teuscher, Jelissa Risse, Arun Aby Paraecattil, Vytenis Pranculis

Applying time-resolved electroabsorption spectroscopy for the first time to methylammonium lead triiodide perovskite (MAPbI3) thin films under reverse bias, we monitored optically the ultrafast evolution of the local counter-electric field produced by the ...

American Chemical Society2016

The Fate of Electron–Hole Pairs in Polymer:Fullerene Blends for Organic Photovoltaics

Jacques-Edouard Moser, Natalie Stingelin, Jan Cornelius Brauer, Jelissa Risse, Mariateresa Scarongella, Natalie Renuka Banerji, Martina Causa'

There has been long-standing debate on how free charges are generated in donor:acceptor blends that are used in organic solar cells, and which are generally comprised of a complex phase morphology, where intermixed and neat phases of the donor and acceptor ...

Nature Publishing Group2016

Chaotropic Agents Boosting the Performance of Photo-ionic Cells

Hubert Girault, Jelissa Risse, Manuel Alejandro Méndez Agudelo, Heron Vrubel, Astrid Johana Olaya Avendano, Pekka Eero Peljo, Romain Bourdon

Photo-ionic cells are a simple and scalable concept for direct solar energy storage, where the redox fuels produced by the photoreaction are separated in different phases to prevent recombination. The presence of chaotropic agents such as urea, that break ...

Amer Chemical Soc2015

Using the Stark effect to understand charge generation in organic solar cells

Jacques-Edouard Moser, Natalie Stingelin, Jelissa Risse, Natalie Renuka Banerji

We have used a femtosecond-resolved spectroscopic technique based on the Stark effect (electromodulated differential absorption) in order to investigate free charge generation and charge drift in solar cell devices of neat conjugated polymer pBTTT and in i ...

Spie-Int Soc Optical Engineering2015

Ultrafast dynamics of photoinduced charge separation in cyanine- and polymer-based organic photovoltaic systems

Jelissa Risse

Organic photovoltaics (OPV) have the potential to provide low-cost solar-to-electricity converting devices. Improving such devices requires a deeper understanding of the ultrafast photoinduced processes occurring after light absorption. We have performed f ...

EPFL2015

Dissociation of charge transfer states and carriers separation in bilayer organic solar cells - A time-resolved electroabsorption spectroscopy study

Jacques-Edouard Moser, Jelissa Risse, Roland Hany

Ultrafast optical probing of the electric field by means of Stark effect in planar heterojunction cyanine dye / fullerene organic solar cells enables to directly monitor the dynamics of free electron formation during the dissociation of interfacial charge ...

Amer Chemical Soc2015

A Close Look at Charge Generation in Polymer:Fullerene Blends with Microstructure Control

Jacques-Edouard Moser, Natalie Stingelin, Jelissa Risse, Mariateresa Scarongella, Natalie Renuka Banerji

We reveal some of the key mechanisms during charge generation in polymer:fullerene blends exploiting our well-defined understanding of the microstructures obtained in pBTTT:PCBM systems via processing with fatty acid methyl ester additives. Based on ultraf ...

Amer Chemical Soc2015

Ultrafast charge transfer in solid-state films of pristine cyanine borate and blends with fullerene

Jacques-Edouard Moser, Frank Nüesch, Jelissa Risse, Jakob Heier

Photoinduced electron transfer in light-absorbing materials is the first step towards charge separation and extraction in small molecule-based organic solar cells. The excited state dynamics of the cyanine dye cation Cy3 paired with a tetraphenylborate cou ...

Royal Society of Chemistry2015

Photoinduced interfacial electron transfer and lateral charge transport in molecular donor–acceptor photovoltaic systems

Jacques-Edouard Moser, Jan Cornelius Brauer, Arianna Marchioro, Jelissa Risse, Elham Ghadiri, Angela Punzi

Nanostructured liquid|solid and solid|solid bulk heterojunctions designed for the conversion of solar energy offer ideal models for the investigation of light-induced ET dynamics at surfaces. Despite significant study of processes leading to charge generat ...

2011

Dynamics and mechanisms of interfacial photoinduced electron transfer processes of third generation photovoltaics and photocatalysis

Jacques-Edouard Moser, Joël Teuscher, Christophe Bauer, Jan Cornelius Brauer, Arianna Marchioro, Jelissa Risse, Elham Ghadiri, Angela Punzi, Mateusz Barnaba Wielopolski, Natalie Renuka Banerji

Photoinduced electron transfer (PET) across molecular/bulk interfaces has gained attention only recently and is still poorly understood. These interfaces offer an excellent case study, pertinent to a variety of photovoltaic systems, photo- and electrochemi ...

2011