期刊
ACS OMEGA
卷 3, 期 10, 页码 13524-13529出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.8b02078
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资金
- JSPS KAKENHI [JP17H02746]
We report on extreme penetration power of relativistic electrons in a micrometer-thick gallium nitride epitaxial film and its application to probing threading dislocations, which were introduced during crystal growth. Maximum usable thickness of the specimen was quantitatively evaluated using high-voltage transmission electron microscopy (TEM) operating at 1 MV. The width of dislocation images was used as a measure for the evaluation of usable thickness. Superior maximum usable thickness was obtained in scanning transmission electron microscopy (STEM) than in TEM mode; the results were 6.9 mu m for STEM and 4.4 mu m for TEM. In STEM, dislocations can be imaged with an almost constant width of 15-20 nm in a wide thickness range 1-4 mu m. The latest high-voltage STEM is thus useful for observing dislocations in micrometer-thick inorganic materials.
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