Prof. Carsten Ronning and Maximilian Zapf.
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A nanowire hard X-ray detector: ACP scientist Ronning publishes in Nature Communications

Together with colleagues from the University of Duisburg-Essen, the European Synchrotron in Grenoble, and Institute de Ciencia de Materiales in Madrid, ACP principal scientist Carsten Ronning has recently published an original research article titled "Hot electrons in a nanowire hard X-ray dedector"" in Nature Communications (Zapf et al., Nature Commun. 11, 4729 (2020).
Prof. Carsten Ronning and Maximilian Zapf.
Image: Anne Günther (University of Jena)
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Published: 23 September 2020, 10:30 | By: Christian Helgert

Journal abstract: Nanowire chip-based electrical and optical devices such as biochemical sensors, physical detectors, or light emitters combine outstanding functionality with a small footprint, reducing expensive material and energy consumption. The core functionality of many nanowire-based devices is embedded in their p-n junctions. To fully unleash their potential, such nanowire-based devices require – besides a high performance – stability and reliability. Here, we report on an axial p-n junction GaAs nanowire X-ray detector that enables ultra-high spatial resolution (~200 nm) compared to micron scale conventional ones. In-operando X-ray analytical techniques based on a focused synchrotron X-ray nanobeam allow probing the internal electrical field and observing hot electron effects at the nanoscale. Finally, we study device stability and find a selective hot electron induced oxidization in the n-doped segment of the p-n junction. Our findings demonstrate capabilities and limitations of p-n junction nanowires, providing insight for further improvement and eventual integration into on-chip devices.

link to the full article

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