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STÖGER-POLLACH, M. BUKVIŠOVÁ, K. SCHWARZ, S. KVAPIL, M. ŠAMOŘIL, T. HORÁK, M.
Original Title
Fundamentals of cathodoluminescence in a STEM: The impact of sample geometry and electron beam energy on light emission of semiconductors
Type
journal article in Web of Science
Language
English
Original Abstract
Cathodoluminescence has attracted interest in scanning transmission electron microscopy since the advent of commercial available detection systems with high efficiency, like the Gatan Vulcan or the Attolight Mönch system. In this work we discuss light emission caused by high-energy electron beams when traversing a semiconducting specimen. We find that it is impossible to directly interpret the spectrum of the emitted light to the inter-band transitions excited by the electron beam, because the Čerenkov effect and the related light guiding modes as well as transition radiation is altering the spectra. Total inner reflection and subsequent interference effects are changing the spectral shape dependent on the sample shape and geometry, sample thickness, and beam energy, respectively. A detailed study on these parameters is given using silicon and GaAs as test materials
Keywords
Cathodoluminescence; Cerenkov radiation; Transition radiation; STEM
Authors
STÖGER-POLLACH, M.; BUKVIŠOVÁ, K.; SCHWARZ, S.; KVAPIL, M.; ŠAMOŘIL, T.; HORÁK, M.
Released
1. 5. 2019
ISBN
0304-3991
Periodical
Ultramicroscopy
Year of study
200
Number
1
State
Kingdom of the Netherlands
Pages from
111
Pages to
124
Pages count
14
URL
https://www.sciencedirect.com/science/article/pii/S0304399118303097?via%3Dihub
BibTex
@article{BUT156365, author="Michael {Stöger-Pollach} and Kristýna {Bukvišová} and Sabine {Schwarz} and Michal {Kvapil} and Tomáš {Šamořil} and Michal {Horák}", title="Fundamentals of cathodoluminescence in a STEM: The impact of sample geometry and electron beam energy on light emission of semiconductors", journal="Ultramicroscopy", year="2019", volume="200", number="1", pages="111--124", doi="10.1016/j.ultramic.2019.03.001", issn="0304-3991", url="https://www.sciencedirect.com/science/article/pii/S0304399118303097?via%3Dihub" }