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Electron spectrometer in adjustable triode configuration for photo-induced field emission measurements

  • We have constructed a new ultrahigh vacuum apparatus with a triode configuration for the systematic investigation of photo-induced field emission (PFE) from metallic or semiconducting cathodes. These are exposed to electric fields up to 400 MV∕m and laser irradiation by means of hole or mesh gates. Cathodes and gates are in situ exchangeable and adjustable with high precision to ensure a homogeneous extraction of electrons which are partially transmitted to the fixed electron spectrometer. Its hemispherical sector analyzer provides an energy resolution limit of 8 meV. The commissioning of the measurement system has been performed with a tungsten needle. Its temperature showed up in the high-energy tail of the electron spectrum, while its work function was derived from the spectral low-energy part combined with the integral current-voltage curve. First PFE measurements on B-doped Si-tip arrays yielded a small field emission current increase under green laser illumination. A shift and splitting of the energy spectra was observed which revealed different emission regimes as well as the photosensitivity of the cathode due to carrier excitation into the conduction band. For the full exploitation of the PFE system, a tunable laser over a wide eV-range is required.

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Metadaten
Author:Benjamin Bornmann, Stephan Mingels, Florian Dams, Christian PrommesbergerORCiD, Rupert SchreinerORCiDGND, Dirk Lützenkirchen-HechtORCiD, Güntner Müller
DOI:https://doi.org/10.1063/1.3673475
Pubmed Id:https://pubmed.ncbi.nlm.nih.gov/22299940
Parent Title (English):The Review of scientific instruments
Publisher:American Institute of Physics
Place of publication:Melville, NY
Document Type:Article
Language:English
Year of first Publication:2012
Release Date:2022/12/11
Volume:83
Issue:1
Article Number:013302
Institutes:Fakultät Angewandte Natur- und Kulturwissenschaften
Fakultät Angewandte Natur- und Kulturwissenschaften / Labor Mikrosensorik
research focus:Sensorik
Licence (German):Keine Lizenz - Es gilt das deutsche Urheberrecht: § 53 UrhG