Organic chemical/biological sensors; Organic solar cells; Charge transport (mobility); Signal transduction; Time-resolved studies; Photocurrent generation; Terahertz spectroscopy; Organic field effect transistors; Conjugated materials (polymers); Pulsed photocurrent techniques
Brauer Jan C., Tsokkou Demetra, Sanchez Sandy, Droseros Nikolaos, Roose Bart, Mosconi Edoardo, Hua Xiao, Stolterfoht Martin, Neher Dieter, Steiner Ullrich, De Angelis Filippo, Abate Antonio, Banerji Natalie (2020), Comparing the excited-state properties of a mixed-cation–mixed-halide perovskite to methylammonium lead iodide, in The Journal of Chemical Physics
, 152(10), 104703-104703.
Ramirez Ivan, Causa' Martina, Zhong Yufei, Banerji Natalie, Riede Moritz (2018), Key Tradeoffs Limiting the Performance of Organic Photovoltaics, in Advanced Energy Materials
, 8(28), 1703551-1703551.
Causa’ Martina, Ramirez Ivan, Martinez Hardigree Josue F., Riede Moritz, Banerji Natalie (2018), Femtosecond Dynamics of Photoexcited C 60 Films, in The Journal of Physical Chemistry Letters
, 9(8), 1885-1892.
Brauer Jan, Causa' Martina, Banerji Natalie (2018), Charge Generation and Recombination in Organic Solar Cells, in Skabara Peter, Malik M. A. (ed.), RSC Publishing, London, 1.
Krauspe Philipp, Tsokkou Demetra, Causa' Martina, Domingo Ester Buchaca, Fei Zhuping, Heeney Martin, Stingelin Natalie, Banerji Natalie (2018), Terahertz Short-Range Mobilities in Neat and Intermixed Regions of Polymer:Fullerene Blends with Controlled Phase Morphology, in Journal of Materials Chemistry A
Wörner Hans Jakob, Arrell Christopher A., Banerji Natalie, Cannizzo Andrea, Chergui Majed, Das Akshaya K., Hamm Peter, Keller Ursula, Kraus Peter M., Liberatore Elisa, Lopez-Tarifa Pablo, Lucchini Matteo, Meuwly Markus, Milne Chris, Moser Jacques-E., Rothlisberger Ursula, Smolentsev Grigory, Teuscher Joël, van Bokhoven Jeroen A., Wenger Oliver (2017), Charge migration and charge transfer in molecular systems, in Structural Dynamics
, 4(6), 061508-061508.
Teuscher Joël, Brauer Jan C., Stepanov Andrey, Solano Alicia, Boziki Ariadni, Chergui Majed, Wolf Jean-Pierre, Rothlisberger Ursula, Banerji Natalie, Moser Jacques-E. (2017), Charge separation and carrier dynamics in donor-acceptor heterojunction photovoltaic systems, in Structural Dynamics
, 4(6), 061503-061503.
Rolland D., Brauer J. C., Hartmann L., Biniek L., Brinkmann M., Banerji N., Frauenrath H. (2017), Charge separation in an acceptor-donor-acceptor triad material with a lamellar structure, in Journal of Materials Chemistry C
, 5, 1383-1393.
Yu X. Y., Rahmanudin A., Jeanbourquin X. A., Tsokkou D., Guijarro N., Banerji N., Sivula K. (2017), Hybrid Heterojunctions of Solution-Processed Semiconducting 2D Transition Metal Dichalcogenides, in Acs Energy Letters
, 2, 524-531.
Banerji N. (2017), Organic Photovoltaics - Pushing the knowledge of interfaces, in Nature Materials
, 16, 503-505.
Peterhans Lisa, Alloa Elisa, Sheima Yauhen, Vannay Laurent, Leclerc Mario, Corminboeuf Clémence, Hayes Sophia, Banerji Natalie (2017), Salt-Induced Thermochromism of a Conjugated Polyelectrolyte, in Physical Chemistry Chemical Physics
, 19, 28853.
Banerji Natalie (2016), Structure-Property Relations in Polymer:Fullerene Blends for Organic Solar Cells, in Chimia
, 70(7), 512-7.
Causa Martina, De Jonghe-Risse Jelissa, Scarongella Mariateresa, Brauer Jan C., Buchaca-Domingo Ester, Moser Jacques- E., Stingelin Natalie, Banerji Natalie (2016), The fate of electron–hole pairs in polymer:fullerene blends for organic photovoltaics, in Nature Communications
, 7, 12556-12556.
Tsokkou Demetra, Yu Xiaoyun, Sivula Kevin, Banerji Natalie (2016), The Role of Excitons and Free Charges in the Excited-State Dynamics of Solution-Processed Few-Layer MoS2 Nanoflakes, in The Journal of Physical Chemistry C
Brauer Jan C., Lee Yong Hui, Nazeeruddin Mohammad Khaja, Banerji Natalie (2016), Ultrafast charge carrier dynamics in CH3NH3PbI3: evidence for hot hole injection into spiro-OMeTAD, in Journal of Materials Chemistry C
, 4, 5922-5931.
Scarongella Mariateresa, De Jonghe-Risse Jelissa, Buchaca-Domingo Ester, Causa’ Martina, Fei Zhuping, Heeney Martin, Moser Jacques- E., Stingelin Natalie, Banerji Natalie (2015), A Close Look at Charge Generation in Polymer:Fullerene Blends with Microstructure Control, in Journal of the American Chemical Society
, 137, 2908-2918.
Scarongella M., Brauer J. C., Douglas J. D., Fréchet J. M. J., Banerji N. (2015), Charge generation in organic solar cell materials studied by terahertz spectroscopy, in Proceedings of SPIE, Organic Photovoltaics XVI
, 9567, 95670M.
Brauer Jan C., Lee Yong Hui, Nazeeruddin Mohammad Khaja, Banerji Natalie (2015), Charge Transfer Dynamics from Organometal Halide Perovskite to Polymeric Hole Transport Materials in Hybrid Solar Cells, in The Journal of Physical Chemistry Letters
, 6, 3675-3681.
De Jonghe-Risse Jelissa, Causa Martina, Buchaca-Domingo Ester, Heeney Martin, Moser Jacques- E., Stingelin Natalie, Banerji Natalie (2015), Using the Stark effect to understand charge generation in organic solar cells, in Proceedings of SPIE, Physical Chemistry of Interfaces and Nanomaterials XIV
, 9549, 95490J.
Our global objective is to understand fundamental material properties (e.g. light-matter interactions, electron transfer processes, charge transport, molecular recognition) of organic semiconductors, mainly conjugated polymers and oligomers, with applications in new generation solar cells, organic transistors and (biological) sensors. The current gap between missing fundamental understanding and the blind development of applications needs to be filled in order to achieve intelligent design of high performance devices. We propose a mechanistic, physical-chemistry approach, but with multidisciplinary scope at the interface of chemistry, physics, engineering and materials science. Our research evolves around the central question of what happens on the ultrashort time scale and ultrasmall length scale in organic solids to induce macroscopic function in devices, and how this can be optimized. Experimentally, we will establish a unique and complementary palette of techniques combining time-resolved spectroscopy, pulsed photocurrent methods, terahertz experiments and device testing.We will balance between building on the success of our ongoing research and reaching towards new conceptual and experimental horizons. To that aim, we will address three interconnected topics:• Light-induced formation of charge carriers for photocurrent generation in solar cells.• Transport of charges on the nanoscale for photovoltaic and transistor applications.• Changes in optoelectronic properties during chemical/ biological sensing leading to signal transduction. We have already gained thorough expertise concerning charge generation for polymer-based solar cells. Many questions nevertheless remain open in the field, where no consensus has yet been reached on issues such as the role played by delocalization, charge transfer states, excess energy and bulk heterojunction structure. The specialized pulsed photocurrent techniques and advanced THz setup that we plan to build for the proposed project are designed to answer those questions. In parallel, we will diversify towards topics that are new to us and also much less investigated in the broader scientific community: Nanoscale charge mobility and sensory response. Charge transport is relevant for photovoltaics, but also allows us to expand our activity to another type of organic device, the field-effect transistor. Indeed, short-range mobility determines how charges move away from the interface at organic heterojunctions, and might as well dictate the macroscopic transport properties in neat conjugated polymer films. Investigating the mechanisms of signal transduction for DNA sensing using conjugated polyelectrolytes and for solid-state sensing using transistors is the most exploratory topic proposed and we will be amongst the first working on the subject. Both sub-projects can be addressed with the same experimental tools as the photocurrent project and concern similar materials. The knowledge that we have about conjugated polymers is therefore particularly well suited to understand subtle transport and transduction mechanisms. In the big picture, our project is relevant beyond science. The understanding we gain is essential to push organic electronics to full potential and towards large-scale implementation, with obvious positive implications for technology, society and the environment. The significant proportion of the proposed research concerning new generation organic solar cells (low-cost, easy processing, large-area, lightweight, flexible) is also of undeniable importance given timely issues of increasing energy demand and need for energy-related research to solve those issues. Similarly, the development of organic transistors with numerous uses in electronics allows saving energy during production and operation. The broader relevance in the development of sensors for explosives as well as of simple biological assays for molecular biology, genetic analysis and clinical diagnosis is likewise beyond doubt.