Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 51: Magnetism Poster B

MA 51.9: Poster

Donnerstag, 4. April 2019, 15:00–18:00, Poster C

Sensitivity enhancement of EPR-on-a-chip with sensor array — •Silvio Künstner¹, Anh Chu², Benedikt Schlecker³, Boris Naydenov¹, Jens Anders², and Klaus Lips^1,4 — ¹Berlin Joint EPR Laboratory, Institut für Nanospektroskopie, Helmholtz-Zentrum Berlin für Materialien und Energie — ²Institut für Mikroelektronik, Universität Ulm — ³Institut für Intelligente Sensorik und Theoretische Elektrotechnik, Universität Stuttgart — ⁴Berlin Joint EPR Laboratory, Fachbereich Physik, Freie Universität Berlin

Electron paramagnetic resonance (EPR) is the method of choice to investigate and quantify paramagnetic impurities in e.g. semiconductor devices, proteins, catalysts and molecular nanomagnets. The current design of conventional EPR spectrometers, however, limits the versatility for operando measurements. Here, we present an improved design of a miniaturised EPR spectrometer, implemented on a single microchip (EPRoC). On the chip, an array of coils each with a diameter of a few 100 µm is used as both a mw source and detector, allowing to perform both EPR spectroscopy and imaging. Due to its compactness, EPRoC can be incorporated in growth reactors, (electro)chemical cells or in UHV environments. The sensitivity of the new design is tested with standard EPR samples for various conditions such as conductive and polar environments to demonstrate its excellent capabilities for operando investigations of thin film solar cell materials and catalysts for solar fuel devices.