Publications de Jakob Heier | EPFL Graph Search

Integration of Metal Meshes as Transparent Conducting Electrodes into Perovskite Solar Cells

Andreas Schueler, Jérémy Jacques Antonin Fleury, René Uwe Schneider, Jakob Heier

As the demand for photovoltaic technologies continues to grow, the quest for efficient and sustainable transparent conducting electrodes (TCEs) rapidly rises. Traditional solutions, such as indium tin oxide (ITO), face challenges related to indium scarcity ...

Wiley2024

Stable MXene Dough with Ultrahigh Solid Fraction and Excellent Redispersibility toward Efficient Solution Processing and Industrialization

Frank Nüesch, Jakob Heier, Shungui Deng

Two-dimensional (2D) transition metal carbides, and/or nitrides, so-called MXenes, have triggered intensive research interests in applications ranging from electrochemical energy storage to electronics devices. Producing these functional devices by printin ...

WILEY2023

Functional Ink Formulation for Printing and Coating of Graphene and Other 2D Materials: Challenges and Solutions

Frank Nüesch, Jakob Heier, Sina Abdolhosseinzadeh, Mohammad Jafarpour

The properties of 2D materials are unparalleled when compared to their 3D counterparts; many of these properties are a consequence of their size reduction to only a couple of atomic layers. Metallic, semiconducting, and insulating types can be found and fo ...

WILEY2022

Enhanced Room-Temperature Photoluminescence Quantum Yield in Morphology Controlled J-Aggregates

Frank Nüesch, Surendra Babu Anantharaman, Jakob Heier

Supramolecular assemblies from organic dyes forming J-aggregates are known to exhibit narrowband photoluminescence with full-width at half maximum of approximate to 9 nm (260 cm(-1)). Applications of these high color purity emitters, however, are hampered ...

2021

Coating Porous MXene Films with Tunable Porosity for High-Performance Solid-State Supercapacitors

Jakob Heier, Sina Abdolhosseinzadeh

Two-dimensional MXenes with their outstanding physical and chemical properties have been extensively used in numerous fields such as electrochemical energy storage, catalysis, and sensing. In these applications, high active surface area and facilitated dif ...

WILEY-V C H VERLAG GMBH2021

Towards industrialization of perovskite solar cells using slot die coating

Frank Nüesch, Jakob Heier

Carbon-based hole transport layer-free carbon mesoscopic perovskite solar cells (MPSCs) are considered to be cell architectures with high potential for commercialization, due to their enhanced stability. In the standard process for large area and module fa ...

Royal Society of Chemistry2020

Two-Dimensional Transition Metal Carbides and Nitrides (MXenes): Synthesis, Properties, and Electrochemical Energy Storage Applications

Frank Nüesch, Jakob Heier, Sina Abdolhosseinzadeh

A family of 2D transition metal carbides and nitrides known as MXenes has received increasing attention since the discovery of Ti3C2 in 2011. To date, about 30 different MXenes with well-defined structures and properties have been synthesized, and many mor ...

2020

Inkjet printed mesoscopic perovskite solar cells with custom design capability

Frank Nüesch, Jakob Heier, Sina Abdolhosseinzadeh

Customizable solar cells are required for aesthetic indoor and outdoor photovoltaic deployment as well as for the freedom of design of small and portable power supplies. We demonstrate that drop on demand inkjet printing can be used for the fabrication of ...

ROYAL SOC CHEMISTRY2020

Nanocellulose-MXene Biomimetic Aerogels with Orientation-Tunable Electromagnetic Interference Shielding Performance

Frank Nüesch, Jakob Heier, Sina Abdolhosseinzadeh

Designing lightweight nanostructured aerogels for high-performance electromagnetic interference (EMI) shielding is crucial yet challenging. Ultrathin cellulose nanofibrils (CNFs) are employed for assisting in building ultralow-density, robust, and highly f ...

2020

Exciton Dynamics and Effects of Structural Order in Morphology-Controlled J-Aggregate Assemblies

Frank Nüesch, Surendra Babu Anantharaman, Jakob Heier

Narrow-band photoluminescence (PL) together with high quantum efficiency from organic molecules is essential for high-color-purity emitters. Supramolecular assemblies like J-aggregates are promising materials due to their narrow PL signal with full-width a ...

2019

Excitonic channels from bio-inspired templated supramolecular assembly of J-aggregate nanowirest

Frank Nüesch, Surendra Babu Anantharaman, Jakob Heier

Supramolecular assemblies with controlled morphology are of paramount importance for energy transport in organic semiconductors. Despite considerable freedom in molecular design, the preparation of dyes that form one dimensional J-aggregates is challenging ...

2019

Gravure printed Ag/conductive polymer electrodes and simulation of their electrical properties

Frank Nüesch, René Uwe Schneider, Jakob Heier

In this paper, some practical issues related to the manufacturing, and design criteria related to the application in devices of a hybrid silver grid/poly (3,4-ethylenedioxythiophene) semi-transparent electrode are discussed. The electrodes are fabricated b ...

SPRINGER LONDON LTD2019

Exploiting supramolecular assemblies for filterless ultra-narrowband organic photodetectors with inkjet fabrication capability

Frank Nüesch, Roland Hany, Surendra Babu Anantharaman, Jakob Heier, Matthias Diethelm

Narrowband photodetectors are useful for a myriad of applications involving color discrimination as well as biological imaging and machine vision. Prevalent devices use broadband light absorbing materials in conjunction with electric (charge collection nar ...

Royal Society of Chemistry2019

Physical vapour deposition of cyanine salts and their first application in organic electronic devices

Frank Nüesch, Léo Duchêne, Antonia Neels, Donatas Gesevicius, Jakob Heier

A symmetrical trimethine indocyanine dye chromophore was modified with the bistriflylimide anion to study the changes in Coulomb interactions, thermal stability and the volatility of the organic salt. The bulky bistriflylimide anion minimizes electrostatic ...

Royal Society of Chemistry2019

Cyanine platelet single crystals: growth, crystal structure and optical spectra

Frank Nüesch, Antonia Neels, Jakob Heier

Crystalline organic semiconducting materials are much in demand for multiple electronic and optoelectronic device applications. Here, solution grown ultrathin rhombic crystals of a trimethine carbocyanine anionic dye are used to establish relationships bet ...

Royal Society of Chemistry2018

Insights into photovoltaic properties of ternary organic solar cells from phase diagrams

Philippe Schwaller, Roland Hany, Surendra Babu Anantharaman, Jakob Heier

The efficiency of ternary organic solar cells relies on the spontaneous establishment of a nanostructured network of donor and acceptor phases during film formation. A fundamental understanding of phase composition and arrangement and correlations to photo ...

2018

Superweak Coordinating Anion as Superstrong Enhancer of Cyanine Organic Semiconductor Properties

Frank Nüesch, Antonia Neels, Donatas Gesevicius, Jakob Heier

The superweak tetrakis(nonafluoro-tert-butoxy)aluminate coordinating anion was employed to introduce pseudo-gas-phase conditions to the 2-[5-(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)-1,3-pentadien-1-yl]-1,3,3-trimethyl-3H-indolium chromophore. The r ...

2018

Increasing Photovoltaic Performance of an Organic Cationic Chromophore by Anion Exchange

Frank Nüesch, Antonia Neels, Donatas Gesevicius, Jakob Heier

2018

Light Scattering Enhancement at the Absorption Edge in Dewetting Droplets of Cyanine Dyes

Frank Nüesch, Jakob Heier, Florent Alexandre Boudoire

Diffraction properties of thin films of dewetted cyanine dye droplets are investigated and related to the complex refractive index. Strong changes in the index of refraction are often found near the absorption edge of organic dyes. Within a small window of ...

Wiley-V C H Verlag Gmbh2017

Strongly Red-Shifted Photoluminescence Band Induced by Molecular Twisting in Cyanine (Cy3) Dye Films

Frank Nüesch, Roland Hany, Surendra Babu Anantharaman, Jakob Heier, Chuyao Peng

Cyanine dye molecules, used as monomers or in aggregate form, find interesting applications in optoelectronic devices. Among the various aggregate species incorporating organic dyes, centrosymmetric dimers are known as nonluminescent. They can act as excit ...

American Chemical Society2017