Publications de Natalie Renuka Banerji

Free Charge Carrier Generation by Visible-Light-Absorbing Organic Spacers in Ruddlesden-Popper Layered Perovskites

Jacques-Edouard Moser, Jun Ho Yum, Kevin Sivula, Natalie Renuka Banerji, Aaron Tomas Terpstra, Simon Nussbaum

Incorporating organic semiconductor building blocks as spacer cations into layered hybrid perovskites provides an opportunity to develop new materials with novel optoelectronic properties, including nanoheterojunctions that afford spatial separation of ele ...

2024

Structural and Photophysical Templating of Conjugated Polyelectrolytes with Single-Stranded DNA

Ursula Röthlisberger, Polydefkis Diamantis, Natalie Renuka Banerji

A promising approach to influence and control the photophysical properties of conjugated polymers is directing their molecular conformation by templating. We explore here the templating effect of single-stranded DNA oligomers (ssDNAs) on cationic polythiop ...

AMER CHEMICAL SOC2020

Salt-induced thermochromism of a conjugated polyelectrolyte

Laurent Alexis Clément Vannay, Anne-Clémence Corminboeuf, Natalie Renuka Banerji, Yauhen Sheima

We report here the photophysical properties of a water-soluble conjugated polythiophene with cationic side-chains. When dissolved in aqueous buffer solution (PBS, phosphate buffered saline), there is ordering of the polymer chains due to the presence of th ...

Royal Soc Chemistry2017

Hybrid Heterojunctions of Solution-Processed Semiconducting 2D Transition Metal Dichalcogenides

Kevin Sivula, Xavier Adrian Jeanbourquin, Natalie Renuka Banerji, Xiaoyun Yu, Muhammad Aiman Bin Rahmanudin Hamdan, Nestor Guijarro Carratala

Exfoliated transition metal dichalcogenides (2D-TMDs) are attractive light-harvesting materials for large-area and inexpensive solar energy conversion given their ability to form highly tolerant heterojunctions. However, the preparation of large-area heter ...

Amer Chemical Soc2017

Charge separation and carrier dynamics in donor-acceptor heterojunction photovoltaic systems

Jacques-Edouard Moser, Majed Chergui, Joël Teuscher, Jean-Pierre Wolf, Ursula Röthlisberger, Jan Cornelius Brauer, Alicia Solano, Natalie Renuka Banerji, Ariadni Boziki

Electron transfer and subsequent charge separation across donor-acceptor heterojunctions remain the most important areas of study in the field of third-generation photovoltaics. In this context, it is particularly important to unravel the dynamics of indiv ...

2017

Charge migration and charge transfer in molecular systems

Jacques-Edouard Moser, Majed Chergui, Joël Teuscher, Ursula Röthlisberger, Christopher Alexander Arrell, Andrea Cannizzo, Pablo Lopez Tarifa, Natalie Renuka Banerji, Elisa Liberatore

The transfer of charge at the molecular level plays a fundamental role in many areas of chemistry, physics, biology and materials science. Today, more than 60 years after the seminal work of R. A. Marcus, charge transfer is still a very active field of res ...

2017

The Role of Excitons and Free Charges in the Excited-State Dynamics of Solution-Processed Few-Layer MoS

Kevin Sivula, Natalie Renuka Banerji, Xiaoyun Yu

Solution-processed semiconducting transition metal dichalcogenides are emerging as promising two-dimensional materials for photovoltaic and optoelectronic applications. Here, we have used transient absorption spectroscopy to provide unambiguous evidence an ...

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

Importance of Unpaired Electrons in Organic Electronics

Mariateresa Scarongella, Natalie Renuka Banerji

The first observation that PBBTPD, a low bandgap, ambipolar conjugated donor-acceptor (DA) polymer based on benzobisthiadiazole (BBT), possesses an open-shell singlet ground state as well as a thermally accessible triplet state is described. Similarly, int ...

Wiley-Blackwell2015

Charge Transfer Dynamics from Organometal Halide Perovskite to Polymeric Hole Transport Materials in Hybrid Solar Cells

Mohammad Khaja Nazeeruddin, Jan Cornelius Brauer, Natalie Renuka Banerji, Yonghui Lee

Organometal halide perovskites have emerged as promising next-generation solar cell technologies presenting outstanding efficiencies. However, many questions concerning their working principles remain to be answered. Here, we present a detailed study of ho ...

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

Charge generation in organic solar cell materials studied by terahertz spectroscopy

Jan Cornelius Brauer, Mariateresa Scarongella, Natalie Renuka Banerji

We have investigated the photophysics in neat films of conjugated polymer PBDTTPD and its blend with PCBM using terahertz time-domain spectroscopy. This material has very high efficiency when used in organic solar cells. We were able to identify a THz sign ...

Spie-Int Soc Optical Engineering2015

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

Charge Separation Pathways in a Highly Efficient Polymer:Fullerene Solar Cell Material

Arun Aby Paraecattil, Natalie Renuka Banerji

PBDTTPD is one of the best conjugated polymers for solar cell applications (up to 8.5% efficiency). We have investigated the dynamics of charge generation in the blend with fullerene (PCBM) and addressed highly relevant topics such as the role of bulk hete ...

Amer Chemical Soc2014

The influence of microstructure on charge separation dynamics in organic bulk heterojunction materials for solar cell applications

Jacques-Edouard Moser, Natalie Stingelin, Arun Aby Paraecattil, Mariateresa Scarongella, Natalie Renuka Banerji

Light-induced charge formation is essential for the generation of photocurrent in organic solar cells. In order to gain a better understanding of this complex process, we have investigated the femtosecond dynamics of charge separation upon selective excita ...

Royal Society of Chemistry2014

Sub-picosecond delocalization in the excited state of conjugated homopolymers and donor–acceptor copolymers

Natalie Renuka Banerji

In this feature article, we review and examine evidence that the primary photoexcited species in conjugated polymers is considerably delocalized. Localization occurs via a series of complex relaxation mechanisms on the

Royal Society of Chemistry2013

Charge transfer relaxation in donor–acceptor type conjugated materials

Ursula Röthlisberger, Andrey Laktionov, Mariateresa Scarongella, Natalie Renuka Banerji

The development of conjugated materials bearing electron-rich and electron-poor units along their backbone introduces new possibilities to control functionality for organic electronic applications through charge transfer character in ground and excited sta ...

Royal Society of Chemistry2013

Sensitization of fullerenes by covalent attachment of a diketopyrrolopyrrole chromophore

Jacques-Edouard Moser, Natalie Renuka Banerji

In an effort to develop new materials for organic solar cell applications, we have synthesized triads of 3,6-dithien-2-yl-2,5-dialkylpyrrolo[3,4-c]pyrrole-1,4-dione (DTDPP) covalently linked at the nitrogen positions to two [6,6]-phenyl-C61-butyric acid es ...

Royal Society of Chemistry2012

Intensity Dependent Femtosecond Dynamics in a PBDTTPD-Based Solar Cell Material

Jacques-Edouard Moser, Arun Aby Paraecattil, Natalie Renuka Banerji

PBDTTPD is a conjugated polymer with high power conversion efficiency if used in organic solar cells together with fullerene derivatives. We have investigated forthe first time the excited state dynamics of pristine PBDTTPD thin film as well as the ultrafa ...

Amer Chemical Soc2012

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