Publications de Jakob Heier | EPFL Graph Search

Publications associées (26)

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

Frank Nüesch, Jakob Heier, Antonia Neels

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

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

Frank Nüesch, Jakob Heier, Surendra Babu Anantharaman

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, Jakob Heier, Surendra Babu Anantharaman

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

Resonance Light Scattering in Dye-Aggregates Forming in Dewetting Droplets

Jakob Heier, Raffaele Mezzenga, Gian-Luca Bona

Small organic semiconducting molecules assembling into supramolecular J- and H- aggregates have attracted much attention due to outstanding optoelectronic properties. However, their easy and reproducible fabrication is not yet sufficiently developed for in ...

American Chemical Society2014

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, Jakob Heier, Surendra Babu Anantharaman

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

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

Frank Nüesch, Jakob Heier, René Uwe Schneider

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, Jakob Heier, Surendra Babu Anantharaman, 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

Growth and Alignment of Thin Film Organic Single Crystals from Dewetting Patterns

Jakob Heier, Raffaele Mezzenga, Thomas Geiger, Gaëtan Wicht, Gian-Luca Bona

Studying and understanding the conditions under which organic semiconductors can be engineered to form aligned single crystals in thin films is of primary importance owing to their unique orientation-dependent optoelectronic properties. Efforts to reach th ...

Amer Chemical Soc2013

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

Frank Nüesch, Jakob Heier, Surendra Babu Anantharaman

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

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

Visible light-emitting host-guest electrochemical cells using cyanine dyes

Frank Nüesch, Jakob Heier, Lei Wang, Surendra Babu Anantharaman

Light-emitting electrochemical cells (LECs) can be fabricated as a single emissive organic/salt layer sandwiched between two electrodes, offering cost-effective next generation signage and lighting applications. Cyanine dyes are especially attractive to ex ...

Elsevier Science Bv2017

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

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

Jakob Heier, Philippe Schwaller, Surendra Babu Anantharaman

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

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

Shungui Deng, Frank Nüesch, Jakob Heier

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

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

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

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

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

Frank Nüesch, Jakob Heier, Antonia Neels, Donatas Gesevicius

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

Superweak Coordinating Anion as Superstrong Enhancer of Cyanine Organic Semiconductor Properties

Frank Nüesch, Jakob Heier, Antonia Neels, Donatas Gesevicius

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

Poly(3-hexylthiophene)/C-60 heterojunction solar cells: Implication of morphology on performance and ambipolar charge collection

Jakob Heier

The performance of heterojunction organic solar cells is critically dependent on the morphology of the donor and acceptor components in the active film. We report results of photovoltaic devices consisting of bilayers and bulk heterojunctions using poly(3- ...

2008

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