Abstract
This paper reviews our recent investigations of compound semiconductors and heterovalent interfaces using the technique of aberration-corrected scanning transmission electron microscopy. Bright-field imaging of compound semiconductors with a collection angle that is comparable in size to the incident-beam convergence angle is demonstrated to provide better atomic-column visibility for lighter elements in comparison with the more traditional high-angle annular-dark-field approach. Several pairs of Group II–VI/Group III–V compound semiconductors with zincblende structure have been studied in detail. These combinations are all valence-mismatched (i.e., heterovalent), and include CdTe/InSb (Δa/a≤ 0.05%), ZnTe/InP (Δa/a = 3.8%), and ZnTe/GaAs (Δa/a = 7.4%). CdTe/InSb (001) interfaces are observed to be defect-free with a slight lattice contraction at the interface plane. For interfaces with larger lattice-parameter mismatch, the primary interfacial defects are identified as Lomer edge dislocations and perfect 60° dislocations. However, the atomic structure of the dislocation cores has not yet been unambiguously determined.
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ACKNOWLEDGMENTS
We thank Jacek Furdyna, Xinyu Liu, Ted Moustakas, Lin Zhou and Lu Ouyang whose collaboration and support made this research possible, and we gratefully acknowledge the use of facilities in the John M. Cowley Center for High Resolution Electron Microscopy at Arizona State University.
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Smith, D.J., Lu, J., Aoki, T. et al. Observation of compound semiconductors and heterovalent interfaces using aberration-corrected scanning transmission electron microscopy. Journal of Materials Research 32, 921–927 (2017). https://doi.org/10.1557/jmr.2016.297
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DOI: https://doi.org/10.1557/jmr.2016.297