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Anna Krammer

Cette personne a quitté l’EPFL

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Publications associées (35)

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In-situ and post annealing effect on the microstructure and the optical properties of black Cu-Co-Mn oxide spinel coating for Parabolic Trough Collector (PTC) applications

Andreas Schueler, Josef Andreas Schuler, Anna Krammer, Samaneh Daviran

The present paper deals with the deposition of Cu-Co-Mn oxides thin film by magnetron sputtering to produce a black selective coating for solar Parabolic Trough Collector (PTC) systems. The effect of temperature was studied between the nominal temperature ...

IOP Science2019

Ug-value and edge heat loss of triple glazed insulating glass units:A comparison between measured and declared values

Andreas Schueler, Anna Krammer

Triple glazed low-e coated insulating glass units with argon filling of five different suppliers on the European market with a declared thermal transmittance in the undisturbed centre of glass (Ug-value) of 0.6 W/m(2)K have been purchased from resellers an ...

ELSEVIER2021

Millimeter-wave-triggering of insulator-to-metal transition in Vanadium dioxide

Anja Skrivervik, Mihai Adrian Ionescu, Andreas Schueler, Anna Krammer, Fatemeh Qaderi Rahaqi, Andrei Müller

We establish insulator-to-metal transition (IMT) in Vanadium dioxide (VO2) by millimeter-wave (mm-wave) actuation, using two coupled dipole antennas: a simple one as a continuous mm-wave-source and the other one with an embedded VO2 part as an absorber. We ...

IEEE2019

Elevated transition temperature in Ge doped VO2 thin films

Mihai Adrian Ionescu, Andreas Schueler, Arnaud Magrez, Wolfgang Amadeus Vitale, Anna Krammer, Piotr Mocny

Thermochromic GexV1-xO2+y thin films have been deposited on Si (100) substrates by means of reactive magnetron sputtering. The films were then characterized by Rutherford backscattering spectrometry (RBS), four-point probe electrical resistivity measuremen ...

2017

Synergistic interactions between PtRu catalyst and nitrogen-doped carbon support boost hydrogen oxidation

Andreas Schueler, Jeremy Luterbacher, Xile Hu, Anna Krammer, Weiyan Ni, Josephine Lederballe Meibom, Lichen Bai, Miyeon Chang, Seunghwa Lee, Songlan Sun, Seongmin Jin, Wenchao Ma, Yiwei Zheng

Hydroxide exchange membrane fuel cell (HEMFC) is a potentially cost-effective energy conversion technology. However, current state-of-the-art HEMFCs require a high loading of platinum-group-metal (PGM) catalysts, especially for the hydrogen oxidation react ...

NATURE PORTFOLIO2023

In-line electronic and structural characterization of reactively sputtered Cu-Co-Mn black spinel oxides

Andreas Schueler, Anna Krammer, Maxime Lagier

Cu-Co-Mn spinel oxide thin films are deposited by reactive magnetron sputtering. The x-ray diffraction (XRD) spectrum suggests a nanocrystalline spinel film when sputtered at approximate to 465 degrees C. In-line scanning tunneling microscopy confirms nano ...

A V S AMER INST PHYSICS2021

Infrared and conductive properties of TCO films deposited by magnetron sputtering at different temperatures

Andreas Schueler, Anna Krammer

Low-emissive Transparent Conductive Oxide (TCO) coatings, such as Indium Tin Oxide (ITO) films, can be used to reduce radiative losses that affect Hybrid photovoltaic-thermal (PV-T) devices. This work shows the optical properties of ITO deposited by magnet ...

EDP Sciences2024

Predicting the thermal performance of thermochromic flat plate solar collectors

Andreas Schueler, Josef Andreas Schuler, Anna Krammer

A thermochromic vanadium dioxide (VO2) based absorber coating is proposed. The optical response of the multilayered absorber is first simulated, then, the spectral reflectance of the deposited absorber is measured. The determined solar absorptance and ther ...

IOP Science2019

MoS2/VO2 vdW heterojunction devices: Tunable rectifiers, photodiodes and field effect transistors

Mihai Adrian Ionescu, Andreas Schueler, Olivier Martin, Arnaud Magrez, Chen Yan, Emanuele Andrea Casu, Nicolò Oliva, Anna Krammer

In this work we report a new class of ultra-thin film devices based on n-n van der Waals (vdW) heteroj unctions of MoS2 and VO2, which show remarkable tunable characteristics. The favorable band alignment combined with the sharp and clean vdW interface det ...

2018

A Steep-Slope Transistor Combining Phase-Change and Band-to-Band-Tunneling to Achieve a sub-Unity Body Factor

Mihai Adrian Ionescu, Josef Andreas Schuler, Wolfgang Amadeus Vitale, Arnab Biswas, Cem Alper, Emanuele Andrea Casu, Teodor Rosca, Anna Krammer

Steep-slope transistors allow to scale down the supply voltage and the energy per computed bit of information as compared to conventional field-effect transistors (FETs), due to their sub-60 mV/decade subthreshold swing at room temperature. Currently pursu ...

Nature Research2017

Coating for optical and electronic applications

Andreas Schueler, Josef Andreas Schuler, Antonio Paone, Anna Krammer

Single- or multilayered coating, such as a selective solar absorber coating or a coating being part of an integrated electronic circuit, comprising one or more layers containing germanium (Ge) doped VO2+x, where -0.1 ≤ x ≤ 0.1. ...