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

Journal Article · Sun Jan 15 00:00:00 EST 2012 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.3673475· OSTI ID:22063765

Bornmann, B; Mingels, S; Luetzenkirchen-Hecht, D; Mueller, G ^[1]; Dams, F; Prommesberger, C; Schreiner, R ^[2]

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1. FB C Physics Department, University of Wuppertal, 42119 Wuppertal (Germany)
2. Faculty of Microsystems Technology, University of Applied Sciences Regensburg, 93053 Regensburg (Germany)

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.

• OSTI ID: 22063765
• Journal Information: Review of Scientific Instruments, Vol. 83, Issue 1; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACCURACY
CARRIERS
CATHODES
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRIC FIELDS
ELECTRON SPECTRA
ELECTRON SPECTROMETERS
ENERGY RESOLUTION
ENERGY SPECTRA
EV RANGE
EXCITATION
FIELD EMISSION
LASER RADIATION
MEV RANGE
PHOTOSENSITIVITY
SILICON
TUNGSTEN
WORK FUNCTIONS