Publications de Roland Hany | EPFL Graph Search

On the Response Speed of Narrowband Organic Optical Upconversion Devices

Frank Nüesch, Roland Hany, Surendra Babu Anantharaman, Wei-Hsu Hu, Matthias Diethelm

Organic upconversion devices (OUCs) consist of an organic infrared photodetector and an organic visible light-emitting diode (OLED), connected in series. OUCs convert photons from the infrared to the visible and are of use in applications such as process c ...

WILEY-V C H VERLAG GMBH2022

Electron Trap Dynamics in Polymer Light-Emitting Diodes

Frank Nüesch, Roland Hany, Michael Bauer, Wei-Hsu Hu, Matthias Diethelm

Semiconducting polymers are being studied intensively for optoelectronic device applications, including solution-processed light-emitting diodes (PLEDs). Charge traps in polymers limit the charge transport and thus the PLED efficiency. It is firmly establi ...

WILEY-V C H VERLAG GMBH2022

Asymmetric azide-alkyne Huisgen cycloaddition on chiral metal surfaces

Harald Brune, Roland Widmer, Roland Hany, Michael Bauer, Samuel Thomas Stolz

Achieving fundamental understanding of enantioselective heterogeneous synthesis is marred by the permanent presence of multitudinous arrangements of catalytically active sites in real catalysts. In this study, we address this issue by using structurally co ...

NATURE RESEARCH2021

Solution Processing and Self-Organization of PbS Quantum Dots Passivated with Formamidinium Lead Iodide (FAPbI(3))

Frank Nüesch, Roland Hany

Solution-processed lead sulfide quantum dots (PbS QDs) are very attractive as NIR-active semiconductors for the fabrication of cost-efficient optoelectronic devices. To control the thin film carrier transport, as well as stability, surface passivation is o ...

2020

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

Near-infrared absorbing cyanine dyes for all-organic optical upconversion devices

Frank Nüesch, Roland Hany, Matthias Diethelm

The development of near-infrared (NIR) photodetection technologies is driven by emerging applications such as medical imaging or optical sensors for electronic displays and machine vision. An all-organic upconverter (OUD) is a device that converts incident ...

2019

Recent advances with optical upconverters made from all-organic and hybrid materials

Roland Hany, Karen Verena Strassel

The growing interest in near-infrared (NIR) imaging is explained by the increasing number of applications in this spectral range, which includes process monitoring and medical imaging. NIR-to-visible optical upconverters made by integrating a NIR photosens ...

2019

Solution-Processed Organic Optical Upconversion Device

Frank Nüesch, Roland Hany, Santhanu Panikar Ramanandan, Sina Abdolhosseinzadeh, Matthias Diethelm

Imaging in the near-infrared (NIR) is getting increasingly important for applications such as machine vision or medical imaging. NIR-to-visible optical upconverters consist of a monolithic stack of a NIR photodetector and a visible light-emitting unit. Suc ...

AMER CHEMICAL SOC2019

Optimized Electrolyte Loading and Active Film Thickness for Sandwich Polymer Light-Emitting Electrochemical Cells

Frank Nüesch, Roland Hany, Matthias Diethelm

Effects of ion concentration and active layer thickness play a critical role on the performance of light-emitting electrochemical cells. Expanding on a pioneering materials system comprising the super yellow (SY) polymer and the electrolyte trimethylolprop ...

2019

The Dynamic Emission Zone in Sandwich Polymer Light-Emitting Electrochemical Cells

Frank Nüesch, Balthasar Bluelle, Beat Ruhstaller, Roland Hany, Matthias Diethelm

In light-emitting electrochemical cells (LECs), the position of the emission zone (EZ) is not predefined via a multilayer architecture design, but governed by a complex motion of electrical and ionic charges. As a result of the evolution of doped charge tr ...

WILEY-V C H VERLAG GMBH2019

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

Dynamics of Charge Distribution in Sandwich-Type Light-Emitting Electrochemical Cells Probed by the Stark Effect

Frank Nüesch, Roland Hany, Matthias Diethelm

2018

Organic Salt Semiconductor with High Photoconductivity and Long Carrier Lifetime

Frank Nüesch, Beat Ruhstaller, Roland Hany, Donatas Gesevicius

2018

Time-Dependent p-i-n Structure and Emission Zone in Sandwich-Type Light-Emitting Electrochemical Cells

Frank Nüesch, Beat Ruhstaller, Roland Hany, Matthias Diethelm

2018

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

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

Frank Nüesch, Beat Ruhstaller, Roland Hany, Lei Wang, Surendra Babu Anantharaman, Jakob Heier

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

Cyanine tandem and triple-junction solar cells

Frank Nüesch, Hui Zhang, Björn Niesen, Roland Hany, Lei Wang, René Uwe Schneider

Ultrathin bilayer heterojunction solar cells using cyanine electron donors and electron acceptor C-60 are used to fabricate monolithically stacked tandem and triple junction devices. Sub-cell stack sequences as well as C-60 layer thicknesses are optimized ...

Elsevier2016

Doping Evolution and Junction Formation in Stacked Cyanine Dye Light-Emitting Electrochemical Cells

Matia Bulloni, Beat Ruhstaller, Roland Hany, Lei Wang

Cyanine dyes are fluorescent organic salts with intrinsic conductivity for ionic and electronic charges. Recently (J. Am. Chem. Soc. 2013, 135, 18008-18011), these features have been exploited in cyanine light-emitting electrochemical cells (LECs). Here, w ...

Amer Chemical Soc2016

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

Resonance Light Scattering in Dye-Aggregates Forming in Dewetting Droplets

Raffaele Mezzenga, Gian-Luca Bona, Roland Hany, Jakob Heier

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