The performance evaluation of direct detection electron energy-loss spectroscopy at 200 kV and 80 kV accelerating voltages

Cheng, Shaobo; Pofelski, Alexandre; Longo, Paolo; Twesten, Ray D.; Zhu, Yimei; Botton, Gianluigi A.

doi:10.1016/j.ultramic.2020.112942

Title: The performance evaluation of direct detection electron energy-loss spectroscopy at 200 kV and 80 kV accelerating voltages

Journal Article · Wed Jan 22 00:00:00 EST 2020 · Ultramicroscopy

DOI:https://doi.org/10.1016/j.ultramic.2020.112942· OSTI ID:1631923

^[1]; Pofelski, Alexandre ^[2]; Longo, Paolo ^[3]; Twesten, Ray D. ^[3]; Zhu, Yimei ^[4]; Botton, Gianluigi A. ^[2]

McMaster Univ., Hamilton, ON (Canada); Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics
McMaster Univ., Hamilton, ON (Canada)
Gatan Inc., Pleasanton, CA (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics

Direct electron detectors (DeDs) have been widely used for imaging studies because of their higher beam sensitivity, lower noise, improved pixel resolution, etc. However, there have been limited studies related to the performance in spectroscopic applications for the direct electron detection. Hereby, taking the advantage of the DeD installed on a high-performance electron energy-loss spectrometer, we systematically studied the performance of a DeD (Gatan's K2 IS) fitted on an aberration-corrected transmission electron microscope (TEM) equipped with an electron monochromator. Using SrTiO3 as the model system, the point spread function in the zero-loss region of the spectrum and the performance for core loss spectroscopy have been investigated under both 200 kV and 80 kV operating conditions. We demonstrate that the K2 detector can achieve an overall better performance at 200 kV than a charge coupled device (CCD) detector. At 80 kV, the K2 DeD is still better than a CCD, except for the relative broad tails of the zero-loss peak. The signal-to-noise ratio is very close for DeD and CCD under 80 kV. Based on our data obtained at different operating voltages, it is clear that DeD will benefit the microscopy community and boost the development of cutting-edge materials science studies by pushing the frontiers in electron energy-loss spectroscopy.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 1631923

Report Number(s):: BNL-215962-2020-JAAM; TRN: US2201035

Journal Information:: Ultramicroscopy, Vol. 212, Issue C; ISSN 0304-3991

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
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Title: The performance evaluation of direct detection electron energy-loss spectroscopy at 200 kV and 80 kV accelerating voltages

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