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Polarity continuation and frustration in ZnSe nanospirals.

Li L, Tu F, Jin L, Choy WC, Gao Y, Wang J - Sci Rep (2014)

Bottom Line: ZnSe nanospirals including structures with polarity continuation and polarity frustration are simultaneously observed at atomic resolution.Through careful analysis of polarity within each dumbbell based on aberration-corrected high-angle annular-dark-field imaging, polarity continuation across parallel polytype interfaces as well as the surrounding Z-shape faulted dipoles is verified.Moreover, polarity frustration across regions with different stacking sequence, which would lead to accumulations of boundary interface charges in the triangular-shaped mixed regions with potential optoelectronic applications, is carefully studied.

View Article: PubMed Central - PubMed

Affiliation: Center for Nanoscale Characterization and Devices, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China.

ABSTRACT
ZnSe nanospirals including structures with polarity continuation and polarity frustration are simultaneously observed at atomic resolution. Through careful analysis of polarity within each dumbbell based on aberration-corrected high-angle annular-dark-field imaging, polarity continuation across parallel polytype interfaces as well as the surrounding Z-shape faulted dipoles is verified. Moreover, polarity frustration across regions with different stacking sequence, which would lead to accumulations of boundary interface charges in the triangular-shaped mixed regions with potential optoelectronic applications, is carefully studied.

No MeSH data available.


Related in: MedlinePlus

Polarity continuation surrounding dislocation cores formed by intersecting stacking faults.(a) Aberration-corrected HAADF image of a Z-shape faulted dipole within ZnSe nanospiral, and the corresponding stacking sequence is overlapped with blue symbols. One of the dislocation core region framed in a red box is magnified and shown in pseudo-color in (b). Single atomic columns at the dislocation core and the dumbbells in the surrounding regions are clearly resolved. Polarity continuation is observed across both of the (111) and (−111) stacking faults planes.
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f3: Polarity continuation surrounding dislocation cores formed by intersecting stacking faults.(a) Aberration-corrected HAADF image of a Z-shape faulted dipole within ZnSe nanospiral, and the corresponding stacking sequence is overlapped with blue symbols. One of the dislocation core region framed in a red box is magnified and shown in pseudo-color in (b). Single atomic columns at the dislocation core and the dumbbells in the surrounding regions are clearly resolved. Polarity continuation is observed across both of the (111) and (−111) stacking faults planes.

Mentions: The Z-shape faulted dipole was first reported in 1963 as faint straight lines in strong-beam electron micrographs of deformed f.c.c. metals20. The atomic structure of the central stacking faults of a Z-shape faulted dipole in deformed GaAs was determined based on HRTEM imaging and image simulations21. The atomic configurations at InAs partial dislocation cores associated with Z-shape faulted dipoles were observed directly using aberration-corrected HAADF imaging22. Figure 3a is aberration-corrected HAADF image of a typical Z-shape faulted dipole within ZnSe nanospiral. The shear distortions present in the image have been removed according to the perfect ZB structure in [0–11] projection, and the high frequency noise has been filtered using the annular mask tool in Digital Micrograph.


Polarity continuation and frustration in ZnSe nanospirals.

Li L, Tu F, Jin L, Choy WC, Gao Y, Wang J - Sci Rep (2014)

Polarity continuation surrounding dislocation cores formed by intersecting stacking faults.(a) Aberration-corrected HAADF image of a Z-shape faulted dipole within ZnSe nanospiral, and the corresponding stacking sequence is overlapped with blue symbols. One of the dislocation core region framed in a red box is magnified and shown in pseudo-color in (b). Single atomic columns at the dislocation core and the dumbbells in the surrounding regions are clearly resolved. Polarity continuation is observed across both of the (111) and (−111) stacking faults planes.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4265773&req=5

f3: Polarity continuation surrounding dislocation cores formed by intersecting stacking faults.(a) Aberration-corrected HAADF image of a Z-shape faulted dipole within ZnSe nanospiral, and the corresponding stacking sequence is overlapped with blue symbols. One of the dislocation core region framed in a red box is magnified and shown in pseudo-color in (b). Single atomic columns at the dislocation core and the dumbbells in the surrounding regions are clearly resolved. Polarity continuation is observed across both of the (111) and (−111) stacking faults planes.
Mentions: The Z-shape faulted dipole was first reported in 1963 as faint straight lines in strong-beam electron micrographs of deformed f.c.c. metals20. The atomic structure of the central stacking faults of a Z-shape faulted dipole in deformed GaAs was determined based on HRTEM imaging and image simulations21. The atomic configurations at InAs partial dislocation cores associated with Z-shape faulted dipoles were observed directly using aberration-corrected HAADF imaging22. Figure 3a is aberration-corrected HAADF image of a typical Z-shape faulted dipole within ZnSe nanospiral. The shear distortions present in the image have been removed according to the perfect ZB structure in [0–11] projection, and the high frequency noise has been filtered using the annular mask tool in Digital Micrograph.

Bottom Line: ZnSe nanospirals including structures with polarity continuation and polarity frustration are simultaneously observed at atomic resolution.Through careful analysis of polarity within each dumbbell based on aberration-corrected high-angle annular-dark-field imaging, polarity continuation across parallel polytype interfaces as well as the surrounding Z-shape faulted dipoles is verified.Moreover, polarity frustration across regions with different stacking sequence, which would lead to accumulations of boundary interface charges in the triangular-shaped mixed regions with potential optoelectronic applications, is carefully studied.

View Article: PubMed Central - PubMed

Affiliation: Center for Nanoscale Characterization and Devices, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China.

ABSTRACT
ZnSe nanospirals including structures with polarity continuation and polarity frustration are simultaneously observed at atomic resolution. Through careful analysis of polarity within each dumbbell based on aberration-corrected high-angle annular-dark-field imaging, polarity continuation across parallel polytype interfaces as well as the surrounding Z-shape faulted dipoles is verified. Moreover, polarity frustration across regions with different stacking sequence, which would lead to accumulations of boundary interface charges in the triangular-shaped mixed regions with potential optoelectronic applications, is carefully studied.

No MeSH data available.


Related in: MedlinePlus