Chin. Phys. Lett.  2003, Vol. 20 Issue (11): 2011-2014    DOI:
Original Articles |
Analysing Imaging Signals of Negative-Charging Contrast in Scanning Electron Microscopy
ZHANG Hai-Bo1;FENG Ren-Jian1;Katsumi URA2
1Department of Electronic Science and Technology, Xi’an Jiaotong University, Xi’an 710049 2Professor Emeritus of Osaka University, Takakura-cho 1-14-9, Miyakojima-ku, Osaka 534-0011, Japan
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ZHANG Hai-Bo, FENG Ren-Jian, Katsumi URA 2003 Chin. Phys. Lett. 20 2011-2014
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Abstract Negative charging of a specimen may produce the image contrast of yielding the information under the insulating thin film in scanning electron microscopy. To clarify and make good use of the recently developed negative-charging contrast (NCC), we propose a simplified procedure for quantifying secondary electron (SE) imaging signals and report the calculated results. The theoretical considerations and calculations are validated by comparing the calculated relation between the SE signal and the surface potential with measured dynamic characteristics of the NCC images. The results show that in the region of weak negative charging the NCC formation is due to the SE redistribution. The intensity of SE signals decreases with the increase of the amount of the SEs returning to the negatively charged surface whose local electric field may attract electrons. This results in the NCC transient characteristics.
Keywords: 68.37.Hk      07.78.+s     
Published: 01 November 2003
PACS:  68.37.Hk (Scanning electron microscopy (SEM) (including EBIC))  
  07.78.+s (Electron, positron, and ion microscopes; electron diffractometers)  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2003/V20/I11/02011
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